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ZL3AI > APRDIG 21.12.03 10:41l 264 Lines 9698 Bytes #999 (0) @ WW
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To : APRDIG@WW
TAPR APRS Special Interest Group Digest for Thursday, December 18, 2003.
1. Re: Help: KPC3+ Schematic or PTT transistor #
2. Re: Holiday Traveling = 144.39 CTCSS 100
3. Re: Holiday Traveling = 144.39 CTCSS 100
4. Re: Help: KPC3+ Schematic or PTT transistor #
5. Re: Holiday Traveling = 144.39 CTCSS 100
6. Re: Holiday Traveling = 144.39 CTCSS 100
7. PCsat ops going well
8. Re: Holiday Traveling = 144.39 CTCSS 100
9. Re: Help: KPC3+ Schematic or PTT transistor #
10. NWS Testing Today
11. Re: Help: KPC3+ Schematic or PTT transistor #
12. Satellite Users Filter on APRS-IS
13. Pathing - "APRS...", "GPS..." ??
14. Re: Help: KPC3+ Schematic or PTT transistor #
15. SmartBeaconing and corner pegging
16. APRS programs for a Dell Axim
17. Ultimeter and long cables
18. Re: APRS programs for a Dell Axim
19. Re: AHubSAT....
20. Re: Holiday Traveling = 144.39 CTCSS 100
21. Re: Holiday Traveling = 144.39 CTCSS 100
22. Re: SPLIT pl TONES
23. Re: APRS programs for a Dell Axim
24. RE: Satellite Users Filter on APRS-IS
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Subject: Re: Help: KPC3+ Schematic or PTT transistor #
From: Bob Bruninga <bruninga@usna.edu>
Date: Thu, 18 Dec 2003 08:28:17 -0500 (EST)
X-Message-Number: 1
It is an FET if I remember correctly, but I replaced mine with a 2n2222
with say a 5k resistor in series with the base. This was on a KPC-9612+
but I assume the circuit is the same... but since the layout is
different, I cant tell you where the transistor is. Just trace it from
the bottom of the board. The PTT lead goes directly to the transistor
(FET?)...
Bob
de WB4APR@amsat.org, Bob
PCsat WEB page http://www.ew.usna.edu/~bruninga/pcsat.html
ISS-APRS FAQ: http://www.ew.usna.edu/~bruninga/iss-faq.html
CUBESAT Designs http://www.ew.usna.edu/~bruninga/cubesat.html
APRS LIVE pages http://www.ew.usna.edu/~bruninga/aprs.html
APRS SATELLITES http://www.ew.usna.edu/~bruninga/astars.html
MIM/Mic-E/Mic-Lite http://ssdl.stanford.edu/mims/
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Subject: Re: Holiday Traveling = 144.39 CTCSS 100
From: Bob Bruninga <bruninga@usna.edu>
Date: Thu, 18 Dec 2003 08:30:52 -0500 (EST)
X-Message-Number: 2
You are absolutely correct! People who set PL 100 on home stations are
like people who call 911 to ask what time it is...
On Wed, 17 Dec 2003, Herb Gerhardt wrote:
>I have been hearing several HOME STATIONS on my D700.
>
>Folks, the 100 CTCS tone is intended to be broadcasted by MOBILE STATIONS
>only, not home stations. So, if you transmit a tone of 100 on your home
>stationary stations, please turn it off.
But it is trivial to see who they are because their calls FLASH on the
screen when you hear the packet... GO educate them....
Bob
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Subject: Re: Holiday Traveling = 144.39 CTCSS 100
From: Bob Bruninga <bruninga@usna.edu>
Date: Thu, 18 Dec 2003 08:41:57 -0500 (EST)
X-Message-Number: 3
On Wed, 17 Dec 2003, Herb Gerhardt wrote:
>... I have been hearing several HOME STATIONS on my D700.
These unthinking individuals probably simply wanted to hear when any APRS
mobile drove by. A laudable interest, but TOTALLY VIOLATES the concept!
Voice ALERT (CTCSS 100) on 144.39 means ONE AND ONLY ONE THING:
1) I am MOBILE
2) I am LIVE and LISTENING
3) I am LOOKING for a QSO
4) My VOLUME IS UP and I WILL hear you.
THe correlary is that at the instant ANY of the above conditions are not
met, then you must turn CTCSS 100 off.
I too would like to monitor at home on CTCSS-100 in the shack to pick up
any passers'by, BUT you cannot do this with a PACKET RIG!!!!!!!!!! because
all radios when set to CTCSS 100 also set PL to 100. THus you are
transmitting PL-100 on your packets and you do not meet the criteria
above.
If you want to monitor Voice Alert at home, you MUST use a voice-only
radio that won't QRM the area with your PL-100 packets.
As with anything, common sense should previal...
YOu might be able to do it by operating the D700 or D7 CROSS-BAND with
144.39 in BOTH sides of the radio. Set the RX side to CTCSS-100 and set
the TX side to NO PL... That is the only way to monitor with CTCSS and
not transmit with PL...
de WB4APR, Bob
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Subject: Re: Help: KPC3+ Schematic or PTT transistor #
From: Bob Bruninga <bruninga@usna.edu>
Date: Thu, 18 Dec 2003 08:48:48 -0500 (EST)
X-Message-Number: 4
If you use a NPN transistor in stead of the FET, Put a resistor (5k or so)
in series with the base lead or you will smoke the TNC CPU...
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Subject: Re: Holiday Traveling = 144.39 CTCSS 100
From: wes@johnston.net
Date: Thu, 18 Dec 2003 09:15:46 -0500 (EST)
X-Message-Number: 5
I don't object to a home user running a 100hz pl tone....
1)so long as he's actually in the shack
2)so long as he's NOT a digipeater (relay or otherwise)
The "radar ping" concept of voice alert is a great one.... it doesn't have
to represent only a mobile user... it means that there is a live operator
sitting at the computer. (Let's hope that all cars have a live operator,
for now I'll assume if they are moving they do).
Of course this sounds great in theory until the home station guy walks out
of his shack and forgets to flip the PL tone off - and that's very likely.
Wes
ham callsign: kd4rdb
find me: http://wesvan.zapto.org
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Subject: Re: Holiday Traveling = 144.39 CTCSS 100
From: "Rich Garcia" <k4gps@bellsouth.net>
Date: Thu, 18 Dec 2003 09:57:53 -0500
X-Message-Number: 6
Let's add willing to talk to that requirement!
-----Original Message-----
From: bounce-aprssig-19959@lists.tapr.org
[mailto:bounce-aprssig-19959@lists.tapr.org]On Behalf Of
wes@johnston.net
Sent: Thursday, December 18, 2003 9:16 AM
To: TAPR APRS Special Interest Group
Cc: aprssig@lists.tapr.org; aprssig@lists.tapr.org; nwaprssig@nwaprs.org
Subject: [aprssig] Re: Holiday Traveling = 144.39 CTCSS 100
I don't object to a home user running a 100hz pl tone....
1)so long as he's actually in the shack
2)so long as he's NOT a digipeater (relay or otherwise)
The "radar ping" concept of voice alert is a great one.... it doesn't have
to represent only a mobile user... it means that there is a live operator
sitting at the computer. (Let's hope that all cars have a live operator,
for now I'll assume if they are moving they do).
Of course this sounds great in theory until the home station guy walks out
of his shack and forgets to flip the PL tone off - and that's very likely.
Wes
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Subject: PCsat ops going well
From: Bob Bruninga <bruninga@usna.edu>
Date: Thu, 18 Dec 2003 10:20:10 -0500 (EST)
X-Message-Number: 7
PCsat is doing fine and will continue in good Sun through New Years Eve.
Seeing about 50 users per day and 30 per pass over the USA. Any packet
station can copy her, just tune 145.825 and watch (1200 baud normal AX.25
packet).
To transmit though her, just set your unproto to UNPROTO APRS VIA WIDE, go
to CONVERSE and type something to somone else you see. This is the same
path as APRS users use terrestrially. (RELAY, PCSAT-1 and W3ADO-1 also
work)... .
See also all captured packets on the downlink on http://pcsat.aprs.org
Passes occur in the mornings and evenings your LOCAL time as shown below:
Sats 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 00
---- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
SO50 *********** *
ISS ***************************
NO44 & 45 ************ *************
Sapphire (45) is 10 minutes behind PCsat in the same orbit. Her uplink is
145.945 and very weak downlink is on 437.095 +/- Doppler. Her digi
callsign is VIA KE6QMD. ISS is not doing packet these days, but we can
hope... so I included it in the list. THese times are for mid N
latitudes.
During travels, set your mobile to 145.825. When you hear one PCSAT pass,
the next one is exactly 100 minutes later and the NEXT day the same pass
is 30 minutes earlier. (And Sapphire is 10 minutes behind it but takes a
UHF beam to hear it on 437.095, though it is easy to hit on 145.945..)
de WB4APR, Bob
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Subject: Re: Holiday Traveling = 144.39 CTCSS 100
From: Keith Allen <kallen2@bellsouth.net>
Date: Thu, 18 Dec 2003 09:24:59 -0600
X-Message-Number: 8
I like that comparison <grin>.
Bob Bruninga wrote:
>You are absolutely correct! People who set PL 100 on home stations are
>like people who call 911 to ask what time it is...
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Subject: Re: Help: KPC3+ Schematic or PTT transistor #
From: David VanHorn <dvanhorn@cedar.net>
Date: Thu, 18 Dec 2003 10:54:27 -0500
X-Message-Number: 9
At 08:48 AM 12/18/2003 -0500, Bob Bruninga wrote:
>If you use a NPN transistor in stead of the FET, Put a resistor (5k or so)
>in series with the base lead or you will smoke the TNC CPU...
The pins won't output enough current to hurt them, but you will not have a
guaranteed turnoff without a pair of resistors, and a look at the datasheet
to set the values.
Very few uP output pins can't withstand a short to VCC or GND indefinitely.
The output stages are usually FETs, which act as small resistors whose
value raises as they get hot.
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