MASSASOIT AMATEUR RADIO ASSOCIATION
                              Bridgewater, Ma.

                       Monthly Electronic Newsletter
                              
                    Massasoit Amateur Radio Association
                          Founded January 6, 1962
                                 PO Box 428
                           Bridgewater, MA  02324
                                 June  1995

FIELD DAY PLANS

Field Day will be held June 24 and 25, Saturday and Sunday, at the
Brockton VA Hospital picnic grove.  Be prepared to come along and
operate, and to have a lot of fun!!  All our logging will be on PC's
this year, even to the point that the PC's will generate CW for those
who want to play on that mode or brush up on your speed.  Ask Bruce,
K1HTN, about how easy it was for him to remember his CW after only an
hour on the air last year.

Setup will start about 8 AM Saturday morning.  We will have 3 HF
stations and possibly some VHF for satellite, packet, and ssb/cw modes
at night.  HF operating for this year will introduce a slight twist in
our operating practice.  We are going to try leaving each station on a
fixed freq.  The idea will be that one station will be on 20M with 160
as its backup.  The second station will have 40M and 15M.  The third
station will run just 80M.

If we are able to get another rig, there is a possibility of a 10M
novice station.  At present though, that is not in the works.  If a
novice wants to use 80, 15, or 40 for novice contacts, that will be
available.  If 10M opens up, we will make some room on one of the rigs
for you.

For Saturday night, we are trying something different from the regular
cookout.  Chef 'EDM's world famous Goulash will have an 'Italian'
flavor to it this year.  That’s all we will say for now, mainly
because we don't know exactly what will be put into it!!!!!  It will
be edible, and you won't have to cook it.  And Joe, N1SGU, will help
to provide real food for those who are not so intrepid in their
culinary voyages of discovery.  Of course, for the benefit of the
newcomers..This is a family affair.  All are welcome.

As of this writing, there does not appear to be a vanity club call in
our future.  The FCC  does not look like it will be processing vanity
calls before mid-summer.  As such, we will be using the clubs generic
call for Field Day - KB1BPZ.

WE FOUND THIS ON PACKET
NEW FIELD DAY LINE LAUNCHER!
From: N0GMT@WV0T
[Editors note - while one of the purposes of Field Day is to try out
new ideas, the following should be ‘discussed’ with the Field Day
committee before you try something similar.    Please?????]

 (The following is presented for informational purposes only, and the
author cannot be held responsible for any injury, damage, or legal
difficulties encountered after using this information.)

Every year, the Jayhawk Amateur Radio Society participates in Field
Day. And for years, many different means were used to try and get our
wire antennas hung higher and better in the trees. We've tried tying a
line to a baseball, slingshots, fishing rods, bows and arrows, even a
professional line-throwing device  borrowed from the Fire Department.
Some worked better than others, but none worked really well.  Then,
several years ago, I brought to Field Day what has since become known
as the Jayhawk Antenna Erector.

The Erector consists of an M1 Garand rifle, the rifle grenade launcher
attachment, several dummy rifle grenades, grenade launching
cartridges, and lots of small (1/8 inch) nylon line.  If one of your
club members has a Garand, everything else can be found at a gun show.
Be sure to get the M31 grenades, with a pointy nose, the older
round-nosed ones won't take much abuse.

To prepare the Erector for use, take about three feet of your nylon
line and tie one end securely to the dummy grenade, where the main
body meets the tail section. Wrap the line with some electrical tape
so it won't slide. Then tie a small loop in the other end of the line.
Your antenna support line can then be tied to this loop. Tie it on
securely!  Have enough line ready to reach completely over the
selected tree, and back to the ground. Tie the far end of the line to
your antenna, then lay the line out on the ground in large
back-and-forth loops, while moving AWAY from the target tree. Be sure
the line cannot snag on anything, when it moves it will move FAST! Tie
the near end of the line to your grenade.
Attach the grenade launcher to the UNLOADED rifle. The launcher has
range rings on it, and the farther down you push the grenade, the
farther it will fly. I have found that on the third ring, the grenade
will pass completely over a 90 foot tree. Press the grenade down to
the desired ring. At this point, safety glasses and ear protection are
MANDATORY! Load a grenade launching blank cartridge into the rifle.
(Do not try to use a noise- making blank, it won't throw the grenade
more than a few feet.  And absolutely do not use a live round with a
bullet in it!).  Make absolutely sure your line and the downrange area
are clear.  (I also yell "FIRE IN THE HOLE!" to warn everybody I am
about to make a loud noise.) Take aim a little OVER your tree and
fire.  With a little practice you should be able to pick the exact
limb or crotch you want.

The Erector has made a big difference in our Field Day operation.  We
easily put up things like an 80 meter full-wave loop, or a 20 meter,
10 element Sturba curtain. If you have the trees, you can use them all
with the Jayhawk Antenna Erector!

One last note: The grenade launching cartridges can be hard to find.
If you are an experienced ammunition reloader, or know someone that
can reload, send me your address via packet, and I will be glad to
send info on making your own.
Rob  N0GMT

VE SESSION WRAP-UP

The VE group gave two sessions within the last month - one in
Bridgewater on April 27 for Dave Topalis, KA1TXO’s sound-alike CW
class.  Dave actually had about half his class ‘fall out’ because they
went ahead and passed their CW requirements before the course was even
over.  Peg Zappulla also attended and easily passed her Novice theory.
She is now working on her Tech theory.  We also had two 12-year-old’s
from South Yarmouth who came in with no accreditation at all.  One
walked out as a Tech, and his friend got Tech w/HF.  Bill and Jeff
Tracey, N1SON and N1SOM each upgraded to Tech w/HF.

The WARC Novice Class, taught by Bob Schillinger, KA1PGU,  at
Stoughton high school hosted a VE session on May 16.   Joe Deree
passed his 13WPM (he was only hoping to pass 5 WPM) to get TECH w/HF.
There is a lot more to write - and we did write it in more detail
earlier.  Unfortunately, a hard disk crash lost the original VE
session news and this report is being written hastily in an attempt to
catch up.  All our old files and resources went up in flames along
with the hard drive.

The session was worked by all the regulars.  Carl Aveni, N1FYZ, ran
CW.  MARA would also like to thank Ernie Guimares, KA1VY; Bob McGuire,
N1HIV; Harry Ketler, W1DGD; Fred Roog, WA1LXP, and Mike Emmons, N1KBW,
along with Bob Schillinger, KA1PGU, for their help, and all the help
from our previous sessions.

EASTERN STATES EXHIBITION
by Bob Mandeville, N1EDM
This letter was received from Larry, K1HEJ, in Connecticut.  Larry is
organizing the amateur radio exhibition that the ESE puts on every
year.  If you are planning to be in the area during the time, you
might think about doing a little 'special event' work to show off ham
radio.  And admission is FREE!  The ESE is in late September, just at
the beginning of foliage season.  The letter is printed in this issue
to let you think about vacation plans or long weekends you might want
to plan on.  This will be repeated again in the September issue!

“Hi Bob!  Its that time of year again, time to start planning the
Eastern States Exhibition ham radio booth.  Your name was given to us
last year as the contact person to remind your club that they can
participate in manning the booth this year.

We run two six hour shifts, one from 10 AM to 4 PM, and the other from
4 PM until 10 PM every day from September 16 through October 1 this
year.

In addition, we are very excited that we have been asked to
participate in the MAJOR exhibit that Eastern States is bringing in
this year.  Those of you familiar with last year's event will no doubt
recall the huge 'White House' exhibit,  Well, this year, it looks like
we've hit the big time.  Contact me for details.

Please bring this reminder to your club and let them know we will be
happy to schedule them for a day.  Contact Larry, K1HEJ by phone at
203-223-0778 (home) or 203-832-2029 (work) or via packet to K1HEJ @
N4GAA.CT

We all look forward to your clubs participation, and remember, once
your shift is over, your complimentary pass will allow you to see all
the general admission events and displays FREE.
73, Larry  K1HEJ”

OTHER UPCOMING EVENTS

ARRL CONVENTION in Manchester, NH,  7/30
NUTFEST  10/8/95
ROCHESTER  10/7/95

HELPFUL WINDOWS HINT

With PC's being used more often in ham radio, it is helpful to share
useful tips and shortcuts with fellow members.  This tip is from a
magazine printed by GATEWAY 2000 Computers.  If you use your SAVE
SETTINGS ON EXIT prompt often from the Program Manager/Options screen,
you know what a hassle it is to click it on to save your new P.M.
screen 'just the way  you like it', then exit Windows and restart it
to get back in.  Then you deselect SAVE SETTINGS ON EXIT so that the
screen won't be inadvertently saved if its changed accidentally.

Rather than go through all that,  hold down the SHIFT key, and
double-click on the large '-' bar in the top left of the screen.
Leave the SAVE SETTINGS ON EXIT option deselected permanently.   And
this leaves you in the Program Managers screen so that you don’t have
to exit unless you want to!

SECRETARY REPORT

The Meeting was called to order by Mark N1NL.  We had been locked out
of the parish hall but the good Father showed up at  last and let us
in.

The Treasurer's report was read and accepted.  There was a $1238
ending balance.  Also a motion was made and seconded to make a $150
donation to St. Thomas for the use of their hall.

The field day sight (VA Hosp in Brockton) was discussed..Set up will
commence on Saturday June 24...at 8:00 AM..Talk in on 180.

Jay, N1fdx reported the new repeater up and running..Jay and Mike,
N1HEU are still working on the controller..They say that a few more
modifications are necessary..and the shed  is still in need of some
electrical work...Anyone out there want to help?

Steve, N1JFU reported some miner problems getting feed from KA1RCI in
Lincoln, RI.  These problems are expected to increase as the foliage
comes in.  A solution is to move the BBS to the repeater sight..(in
the works)  This should give a good line of sight to KA1RCI..and to
those of us on the fringes..

Bruce K1HTN Displayed a five element 2 meter homebrew quad. This was
made from 2X2 pine, bicycle flag fiberglass and copper wire..Real
neat..total cost..under $20 dollars (and a few splinters)

DREAMERS ON LINE

Larry, AA1FS is going great guns with his land line BBS.  Larry uses a
combination of satellite and standard links to provide the latest in
shareware programs and news weather and sports.  There are currently
eight computers networked together..An internet connection is also in
the works  The fee for this service is $36 paid yearly.  Amateur radio
operators get a 20% discount.  This make it very cost competitive with
other on-line services.  You get an e-mail address.  You will be able
to log on for a free trial membership.Larry also operates the Whale
Node on packet.  1 508 991 6058

WHAT IS PACKET RADIO?
(author unknown)  Edited by N1MII
The following was downloaded from the internet.

Packet Radio is (yet another) digital transmission method available
for use on Amateur Radio. It provides 'error free' transmission and
reception of messages (information/data/etc.) between two stations.
This error free capability is a prime consideration  ('error free' in
this context does not mean that your 'typing or spelling' mistakes
will be fixed, but that all transmitted 'data' will be received 100%
intact, as sent).  In fact, if the data cannot be delivered 100%
intact, the sending is eventually aborted and the user is informed
that there is no longer a 'connection' between the two stations.

The 'Packet' in 'packet radio' comes from the method of transmitting
your information over the air.  Your 'data' is broken up into packets
(or blocks) that are transmitted. Each packet contains the sending and
the receiving station callsigns and some optional 'routing'
information.  A packet can contain from 0 to 256 data (or information)
bytes. The users normally do not need to be concerned with this
'packetizing' of their messages. Each packet is sent and then
acknowledged by the receiver when received.  If a packet is not
received correctly, then it is automatically re-transmitted (up to a
maximum number of times).

One of the more popular protocols used for Amateur Packet Radio is
known as AX.25.  This is very similar to the commercial X.25 standard.
There is also a growing TCP/IP user base. If you are not network
oriented, then the details of these protocols are not important to you
as an operator of a packet radio station.

Be aware that most packet radio operation at this time is at 1200
baud. This will seem slow when compared to what it happening on
networks, and on telephone BBS's....but what is gained is world wide
access, for NO COST.  Once you have your equipment, and your license,
there are no fees (except for the electricity that your computer and
other equipment use.

What kind of equipment due I need, and how do I use it with my
computer?
Once you have a computer, you already own the most expensive part of
an Amateur Radio Packet  station. The other piece of equipment that
you need is the TNC (Terminal Node Controller). The TNC contains all
the software and special hardware that you need. It actually contains
the MODEM (to interface with your radio) and (usually) a
microprocessor with the packet software contained in EPROM. You
interface your computer (or even a simple dumb ASCII terminal) with
the TNC via serial RS-232. Use your favorite 'terminal emulation
software' on your PC (the same software that you use with your
telephone modem will probably work fine).

Most 'primary' packet radio operations occur (in the USA) on the two
meter band. Check out the following frequencies (they my be different
in your area.  Check with some local hams if you don't hear anything)
even the typical 'police scanner' can be used to listen to these
frequencies:

145.01, 145.03, 145.05, 145.07, 145.09 Mhz also, if the above are
busy, many areas also use: 144.91, 144.03, 144.95, 144.97, 144.00 Mhz

Yes, this is with a 'standard' FM radio set for SIMPLEX transmitting.
If there are packet radio transmissions you should hear a sound like:
BBBBbbbbbrrrrraaaaaaappppppp

How much technical (hardware) proficiency is required to manage a
packet radio system? (I have a general understanding of hardware, but
am more comfortable programming.)

Well, if you can plug an RS-232 cable into a modem, and wire the TNC
to your radio (most TNC's connect to the microphone plug of an FM rig,
normally only needing Push To Talk, and Transmit Audio, plus a
connection to the speaker audio output from the FM receiver), then you
have all the ability that you need. If you are not comfortable with
wiring a microphone connector...I am sure that there are hams that
would be glad to help you.

It really is very simple, and once it is done, there is virtually no
maintenance.  Just plug in your TNC in place of your microphone and
external speaker jack, and you're on the air...to return to voice
operation, plug in your microphone.  If you like, build a simple
switch box to allow easy changing between your TNC and voice
operation.  I don't recommend it, but some wire the TNC and Microphone
in parallel, so that they don't need to change the plugs, or switch
anything at all.

Just what's out there for me to access via packet radio?

Here comes the interesting part....I believe that packet radio is
still in its infancy...It seems like every day a new application for
packet radio is announced...some are good ideas..others not.
Here is a *simple* list that just highlights some of the available
uses of Amateur Packet Radio.. I am SURE that I have forgotten
something and left it off the list:

EMAIL: At this time we have 'world wide' email distribution.  I
personally have received email from a few continents, and from all
over the USA. Of course, this is limited by the Amateur Radio
rules/regs, so there can not be any commercial messages. This is
possible with "store and forward" bulletin board systems (BBS) that
automatically forward message from location to location until it
reaches a destination BBS.

Bulletin boards (BBS’s), which are similar to telephone BBS’s and
carry postings similar to the stuff on Usenet and other computer
services.  Also they often have archives of useful files (such as
local ham license testing sites).  These are usually the same systems
that transport email which also makes it possible to post notices on
BBS all over the country.

File transfers:  Better at 56 Kbaud (as some hams are doing), but
feasible at 1200 baud. This includes all types of files, not just
ASCII text, so it is possible to transfer programs, graphics, etc. The
capability for doing this is dependent on what type protocol in use
and the amount of traffic on the frequency being used. On TCP/IP, you
just start it and forget it, so you can do them overnight or at some
other time when you don't care whether it takes a while.)

Local networks: Here in New England there is connectivity over most of
the 6 states.  From Derry, NH, for example, it is possible to
'connect' to other stations from the following areas consistently:
Canada (Quebec), Vermont, New Hampshire, Maine, New York, Connecticut,
Rhode Island. Of course, on HF there can be 'world wide' connectivity,
depending on many factors.

DOSGATE:  A system that allows you to execute programs remotely.  A
DOSGATE system may have many programs for you to use over the air. You
don't need to download the programs to use them, you are actually
running programs remotely. For example, my DOSGATE system has the
following programs available for use by 'remote' packet users:

AUTOEXAM: take the latest Amateur Exams from Novice to Extra, used as
a study guide, or to see if you are ready for the licence exam.

SeeSats: Real time satellite tracking. Informs you of where the
current OSCAR (and other) satellites are located.

AUTOCALL: Online Amateur Radio USA 'callsign' lookup database. Simply
enter the callsign of any amateur radio operator in the USA and it
will print out the name, address, licence class and previous callsign
(if any).

GAMES: Several 'adventure style' games that can be played online.

Repeater database: A database of many of the repeaters in the area.

DOSGATE allows those who don't have a computer to run programs via
packet radio. (dumb terminal users)

Databases. It is also possible to access databases without DOSGATE.
There are several available in different parts of the country. You can
remotely access callbook (address information), vessel tracking info,
HAZMAT (hazardous materials). The DX Packet Cluster also provides a
variety of DX information from its database.

PacketCluster-DX spotting: This is a specialized system that allows a
couple hundred users to be 'connected' to the same system at one time.
It is used by those Amateur operators who seek contacts with rare
stations throughout the world. When any one user 'finds' a rare
station on the air, he simply types the information (callsign,
frequency and mode) into his terminal, and within a minute or so,
everyone of the other users connected to the 'packet cluster' are
informed of the rare station!!!   "DXers" (people who love to hunt
these rare stations) LOVE this system.  These users can be spread over
a wide area (our local packet cluster system has connectees from Maine
to New York).

Gateways: Even though you may not own any HF or UHF equipment (many
packet radio operators only use a simple 'hand-held' FM transceiver),
you can gain access to other bands and operating modes by using a
gateway. A gateway allows connectivity between two normally
un-connectable communication technologies.

Public Service: Many packet stations are used to help out with sending
messages during disasters. Amateur Radio operators help out whenever
they can, and many Hams have their packet stations ready for portable
operation to help when needed. There are many 'training' exercises
during each year to help practice and test the 'readiness' of the
emergency stations.

OSCAR Satellites: OSCAR stands for Orbital Satellites Carrying Amateur
Radio. We have our OWN satellites in orbit that are dedicated for
Amateur Radio use.  There are some satellites that are dedicated to
packet radio (sometimes called "PACSATS"). Some of these are special,
others are for 'store-and-forward' operations to help distribute
'packet traffic' around the world.

Station-Station: I almost forgot..many people just like 'chatting'
with their neighbors..These could be people from across the
street...or in the next state, or half way around the world!

I am sure that I have missed something...maybe others can fill in the
gaps here. You asked about potential...as I stated at the beginning,
we are just getting started!!! Many people are just finding out about
packet radio.  I believe that the only limitation is our imagination!!
We could have a world wide network (we do currently have a
'slow-speed' world wide network) in the near future...It just takes a
little imagination...

How much will a packet radio set-up cost me? How COST EFFECTIVE is
packet radio?

Well, if you own the PC already...TNC's can be purchased from about
$120 on up.  There are a few for less money, and several that provide
for operating on many digital modes besides packet radio (i.e.: the
Kantronix KAM will provide for: PACKET (HF:300 baud/VHF:1200 baud),
AMTOR, RTTY, ASCII, NAVTEX, WEFAX, CW (morse code),...). If you
already own an Amateur FM transceiver (or an HF SSB transceiver) then
you have all the equipment needed.  If not, a two meter FM rig can be
purchased for: used: from $100-250, new: from $300 on up.

Cost effective....Hmmm, well first be aware that Amateur Radio cannot
be used for any commercial or business purposes...But where else can
one get hours (years) of 'enjoyment' and service out of $450.00 ($350
for a radio and $100 for a TNC, assuming you already have the computer
or terminal). Note: This stuff can be contagious....be forewarned :-)
!!

6) What legal issues do I need to consider regarding packet radio? Do
I need a license?

Yes, you need a Valid Amateur Radio License. There is Packet radio
activity on the Novice bands. But if you want access to the
'mainstream' of packet radio, you will want at least a Technician
Class Amateur Radio License.

There are a few books, etc...but I have found that most assume that
you already know about Amateur Radio.  You need to find what we call
(ready for another term?) an "Elmer"....An "elmer" is a friendly,
helping Amateur Radio operator who will 'take you under his/her wing'
to help and guide you as much as you need. I hope that you can find
someone to help you...it takes a special kind of person to be an
'elmer' (gosh I hate that term).

INTERNET PACKET BBS GATEWAY

Are there any gateways for mail or news between Internet and Amateur
Packet radio?

Jim Durham, W2XO, maintains a gateway between Internet and the Packet
radio BBS system.

To mail from Internet to Packet:
1.   Mail to: "bbs@w2xo.pgh.pa.us"
2.   Make the first line of the text a Packet BBS "send" command, ie:
SP TOCALL @ BBSCALL.ROUTING-HINTS < FROMCALL
3.   The "subject" line of the Internet mail becomes the "title" line
of the Packet BBS mail.

NOTE:     Because of FCC regulations, Jim must hand filter each
message sent FROM Internet TO the Amateur Packet Radio BBS system.
Messages should be of minimal length and appropriate content.  Read
Section 1.9 (Do's and Don'ts:
Rules and Regulations) regarding appropriate usage of packet radio for
more information.  Always include the routing hints with the BBS
callsign.

To mail from Packet to Internet:
 1.   The amateur radio operator must have his callsign registered in
the gateway alias list.  If you want to mail from packet to a specific
amateur on Internet, send mail to
'durham@w2xo.pgh.ps.us'(Internet)or'W2XO @W2XO.#WPA.PA.USA.NAOM'
(Packet BBS mail) with his/her amateur callsign and their Internet
address.
 2.   Once the above is accomplished, packet BBS mail should be sent
to 'CALL @W2XO.#WPA.PA.USA.NAOM'.  The mail will automatically be
forwarded to the Internet address of the amateur with the 'CALL'
callsign.

Jim Durham's Internet address is 'durham@w2xo.pgh.ps.us'.

LAN Gateways (Packet wormholes via Internet)

Currently a group of amateurs are experimenting with connecting packet
LANs together via Internet IP inside IP Encapsulation. Some of the
gateways only accept TCP/IP packets, others AX.25 packets.  These
gateways uses the Internet as a transport medium, thus it is
impossible to access the packet radio network from Internet.  For more
information, join the Gateways mailing list by sending mail to
"gateways-request@uhm.ampr.org".

 FOR SALE; TS-520S
George Nowell, KA1JCT’s Kenwood TS-520S is still for sale.  This
version of the -520S is rigged to operate on 12VDC.  An operators
manual is included.  George says the rig needs some minor work in the
screen-grid circuit.  It operates OK with the screen grid out of
circuit, but when it is selected in, the 6-amp fuse blows.  Someone
who is handy with repairing tube rigs would find this most likely an
easy one to repair, at a bargain price.  George is asking $200 firm.
Contact him on the repeater or at 508-583-3692.

EVEN More ham gear for 4 sale
Bob Mahoney, K1WMT, has the following for sale or swap.  Any
reasonable (or even semi-reasonable) offer will be considered;IC2AT
BP5 battery (unused for 7 years); IC3AT battery;  Icom drop in charger
for the BP5 battery.  Yaesu 703B 440 HT (used once).  MFJ 1274 TNC
still in box; C=64 computer still in box.
MUST HAVE HAM TICKET.  Contact Bob Mahoney K1WMT at 508-238-7568
before 9pm.

COax chart
Contributed by Mark Greenlaw, N1NLR (from the Internet).  This is the
type of information most ham put in their ‘reference’ 3-ring binder.

Get out the Belden & Pasternack catalogs.  As far as I know, the RG
numbers look random.  Probably assigned by a clerk in the Pentagon
during WW2.  Below is a short table of the various coaxes and the more
important characteristics.  [NB: TRIVIA item - RG stands for Radio
Grade.  Thanks to Ed Gleason, KA1KY for that information.]

RG  # Impedance    Attenuation per 100'    Velocity   Max voltage
                   @ 50mhz                 @ 1GHz                  RMS (kv)

RG6U       75      1.5 dB                  11 dB      78%(foam)        0.6
RG8U       52      1.2                     9          66 (polyethlene) 5.0
RG8U       50      1.1                                78  (foam)       0.6
RG8X       50     13.5                                                 2.5
RG9U       51      1.6                                66 "             5.0
RG11U      75      1.3                     9          66 (poly)        5.0
RG11U      75      1.0                                78 (foam)        0.6
RG58U      53      3.1                     20         66 (poly)        1.9
RG58U      50      3.2                                78 (foam)        0.2
RG59U      73      2.4                     11.5       66 (poly)        2.3
RG59U      75      2.1                                78 (foam)        0.3
RG122U     50      7.5                     29.2       66 (poly)        1.9
RG141U     50      2.1                     13         69 (teflon)      1.9
RG174U     50      6.6                     31         66 (poly)        1.5
                                            
RG178U     50     10.5                     45         69 "             1.0
RG179U     75      8.5                     25         69 "             1.2
RG187U     75      8.5                     25         69 "             1.2
RG188U     50      9.6                     30         69 "             1.2
RG213U     50      1.6                     9          66 "             5.0
RG214U     50      1.6                     9          66 "             5.0
RG223U     50      3.1                     16.5       66 "             1.9
RG303U     50      2.1                     13         69 "             1.9
RG316U     50      9.4                     30         69 "             0.2
ethernet   50      1.2                                78 (foam)        0.6
twin lead  300     0.8 <-worse when wet!              80 (poly)        ?
8281       75      9.2                                                 2.9
9913       50      4.5                                                 0.6
9914       50      6.0                                                 0.6
8218       75     20.0                                                 0.6

The attenuation cu