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Subject: HamDigitalDigest 99/305A
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Ham-Digital Digest Sun, 28 Nov 99 Volume 99 : Issue 305
Today's Topics:
2 meter APRS transmitter for rocket (2 msgs)
anyone here using the new SCS PTC-IIE? or on Winlink??
Best Windows Terminal Program for WA8DED TNCS
Computer RF noise in HF SSB
good 9k6 pkt rig ? (2 msgs)
GSM 900 cellular (2 msgs)
PACOMM Packet modems (2 msgs)
PCB-88 board/Pacratt
TFX & TXPCX WA8DED emulators for KISS modems (2 msgs)
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We trust that readers are intelligent enough to realize that all text
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policies or positions of any party. Your mileage may vary. So there.
Loop-Detect: Ham-Digital:99/305
----------------------------------------------------------------------
Date: Sat, 27 Nov 1999 07:50:01 -0600
From: "Charles Brabham" <n5pvl@texoma.net>
Subject: 2 meter APRS transmitter for rocket
Anonymoose <anonymoose@ISP.com> wrote in message
news:ysP%3.513$x67.585@198.235.216.4...
>ignorant tripe snipped<
Ever notice how when the cowards and blowhards come out of the woodwork,
they *attempt* to conceal their identity?
My theory is that if the poster is too cowardly to identify himself, he's
not worth paying ANY attention to.
--
73 DE Charles Brabham, N5PVL
N5PVL @ N5PVL.#NTX.TX.USA.NOAM
http://www.texoma.net/~n5pvl
>.
------------------------------
Date: Sat, 27 Nov 1999 09:02:45 -0500
From: Gary Coffman <ke4zv@bellsouth.net>
Subject: 2 meter APRS transmitter for rocket
On Thu, 25 Nov 1999 21:24:17 -0800, dchapman@postoffice.pacbell.net wrote:
>Steve Sampson wrote:
>>
>> you might try one of those FM mic types you see in popular science
>> magazine. You should be able to tune it to 140 MHz with a little coil
>> bending if you really have to have it in the ham band.
>
>It's got to be in the ham band because I'll need at least 4-5 watts for
>this one. This rocket is not a model or even what is commonly known as
>"high power". It's powered by a liquid fuel 300 pound thrust motor, and
>will be flown by the Pacific Rocket Society. Expected altitude around
>25,000 feet, landing zone within about 5 miles (hopefully).
You shouldn't need that much power. When we fly high altitude balloons
(up to 100,000 feet), we typically use no more than 100 mW for the beacon.
That can be heard more than 100 miles when at altitude. Standard DF
techniques should allow you to recover a payload emitting less than 100 mW.
You'll know roughly where it came down since you'll be tracking it on the way
down. When you drive to that area, you should be able to hear the beacon on
the ground.
You want to use the minimum power possible so that the batteries will
keep the beacon operating long enough to recover the payload. That can
take several hours (sometimes days if it comes down in an inaccessable
location), and a 5 watt transmitter would drain any reasonable size battery
much quicker than that. Besides, power and weight are at an extreme
premium in this sort of situation. You really can't afford to carry enough
battery capacity to operate at higher power.
>I'm looking for a 2meter kit with as much solid state components as
>possible. Coils have a way of changing their reactance when subjected
>to 50g's!
Pot it in epoxy. Note that potting also implies use of rather low power
because heat won't be able to efficiently escape from a potted circuit
and higher power transmitters get hot. Another tip, it gets bloody cold
at high altitudes, insulate the frequency determining components against
this, or the transmitter may quit, or drift very far off frequency. We use
styrofoam insulation for balloon payloads. Of course they stay up there
longer than your payload will, but the ride down on the parachute will
still take several minutes, and that's long enough to cause serious
temperature effects to an uninsulated payload.
Gary
Gary Coffman KE4ZV | You make it |mail to ke4zv@bellsouth.net
534 Shannon Way | We break it |
Lawrenceville, GA | Guaranteed |
>.
------------------------------
Date: Sat, 27 Nov 1999 22:46:51 -0800
From: Patricia Gibbons <wa6ube@ix.netcom.com>
Subject: anyone here using the new SCS PTC-IIE? or on Winlink??
W6RCecilA wrote:
>
> Patricia Gibbons wrote:
> >
> > I'm looking into getting the new
> > SCS PTC-IIE and getting active in
> > the winlink system..
> >
> > anyone else here active on winlink
> > and/or using the PTC-II or the new
> > PTC-IIE ??
>
> The world-wide list is in your email.
> --
> 73, Cecil, W6RCA http://www.mindspring.com/~w6rca
Thanx Cecil!! I appreciate it..
As far as Winlink and/or AirMail.. I am a real
newbie here :-(
Trish
--
Patricia E. Gibbons
Acting Chief Communications Technician
City of San Jose - ITD/communications
<http://www.qrz.com/callsign.html?callsign=wa6ube>
.......................................
My Public Key is available at:
<http://pgp5.ai.mit.edu:11371/pks/lookup?op=vindex&search=0xEDECB44F>
Key ID: 0xEDECB44F
This key is RSA, NOT Diffie-Hellman !!
>.
------------------------------
Date: Thu, 25 Nov 1999 09:53:03 -0500
From: "Rob" <NoEmail@NoWay.com>
Subject: Best Windows Terminal Program for WA8DED TNCS
Hi Roger,
I went to your web site and download WinPack 6.40 and the upgrade to 6.42.
I am very impressed with Winpack. You must have spent a lot of time
developing it. The docs are also excellent. A first class product!
After reading the docs, I noticed that Winpack in TF2.7b mode does not use
any handshaking (also ignores number of stop bits etc). Why is this?? I
always thought WA8DED host mode could use and normally did use handshaking.
Am I wrong??
Rob
"Roger Barker" <roger@peaksys.co.uk> wrote in message
news:J7oBQCAP0GP4EwDO@peaksys.co.uk...
> In article <84U_3.193227$5r2.446546@tor-nn1.netcom.ca>, Rob
> <NoEmail@NoWay.com> writes
> >Hi Roger,
> >
> >I am not that famiuliar with TF2.7b. But is it a KISS to WA8DED
emulator??
> >If so, I assume the TNC must be in KISS mode (ie the WA8DED host mode
> >supported by the TNC is not used)
>
> TF firmware is a super-set of WA8DED. WinPack in "TF2.7b" host mode will
> detect that it is in fact talking to WA8DED and modify its behaviour
> accordingly.
>
> --
> Roger Barker, G4IDE roger@peaksys.co.uk
> Boston, UK http://www.packetradio.org.uk
>.
------------------------------
Date: Wed, 24 Nov 1999 07:02:00 -0500
From: Robert Cook <captcook@mindspring.com>
Subject: Computer RF noise in HF SSB
To be continued in digest: hd_99_305B
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