FT-726 automatic Doppler control?
Anybody ever rig up automatic doppler tuning to a FT-726? Without a CI-V interface (or equivalent) the best idea I can think of is splicing a microcontroller in to push the up, down, and maybe the fast buttons on the microphone during a pass.
Then I'd just have to dial in the initial frequency before the pass starts.
73, Ryan KB1LKI AMSAT #37207
There used to be a way to Doppler tune freq's via the data/packet port? I vaguely remember something about being able to do this. Check the archives late 1990's....
73 Jeff kb2m
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Ryan Caron Sent: Wednesday, March 24, 2010 18:48 PM To: [email protected] Subject: [amsat-bb] FT-726 automatic Doppler control?
Anybody ever rig up automatic doppler tuning to a FT-726? Without a CI-V interface (or equivalent) the best idea I can think of is splicing a microcontroller in to push the up, down, and maybe the fast buttons on the microphone during a pass.
Then I'd just have to dial in the initial frequency before the pass starts.
73, Ryan KB1LKI AMSAT #37207 _______________________________________________ Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
Jeff, great memory, found a post dated 11/29/1999 from G3RWL (with the descriptive subject "Re: Inquiry"). It refers to the G3RUH auto-tune circuit that utilizes the mike click methods.
http://amsat.org/amsat/archive/amsat-bb/199911/msg00412.html
Alan, perhaps I can tap the VFO selector and switch back and forth between mike clicks? It's no CAT interface, but maybe it'll do.
By the way I noticed the archives only go back to 2/98. Is there another archive that goes back further, or is that the whole -bb?
On 3/24/10 4:12 PM, Jeff KB2M wrote:
There used to be a way to Doppler tune freq's via the data/packet port? I vaguely remember something about being able to do this. Check the archives late 1990's....
73 Jeff kb2m
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Ryan Caron Sent: Wednesday, March 24, 2010 18:48 PM To: [email protected] Subject: [amsat-bb] FT-726 automatic Doppler control?
Anybody ever rig up automatic doppler tuning to a FT-726? Without a CI-V interface (or equivalent) the best idea I can think of is splicing a microcontroller in to push the up, down, and maybe the fast buttons on the microphone during a pass.
Then I'd just have to dial in the initial frequency before the pass starts.
73, Ryan KB1LKI AMSAT #37207 _______________________________________________ Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
Ryan,
Remembering a loooong way back, but there is a RX-TX control which selects which the frequency and other controls effect. That include the mike steps. So you can use the mike click, but there is no good way to work with both TX and RX. The clicks get spread between them. Back in the packsat days, I set the uplink and left it alone. Then I switched to the RX and let the AMSAT-TAPR interface do the frequency tracking. The DSP-2232 would also work, though only for 1200 baud.
Alan WA4SCA
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Ryan Caron Sent: Wednesday, March 24, 2010 5:48 PM To: [email protected] Subject: [amsat-bb] FT-726 automatic Doppler control?
Anybody ever rig up automatic doppler tuning to a FT-726? Without a CI-V interface (or equivalent) the best idea I can think of is splicing a microcontroller in to push the up, down, and maybe the fast buttons on the microphone during a pass.
Then I'd just have to dial in the initial frequency before the pass starts.
73, Ryan KB1LKI AMSAT #37207 _______________________________________________ Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
I remember this now. You would wire it up to the MIC connector, using the MIC up/down switches to change frequency up/down. Also if I remember right, the s/w would track the 1200 baud tones?
73 Jeff kb2m
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Alan P. Biddle Sent: Wednesday, March 24, 2010 23:15 PM To: 'Ryan Caron'; [email protected] Subject: [amsat-bb] Re: FT-726 automatic Doppler control?
Ryan,
Remembering a loooong way back, but there is a RX-TX control which selects which the frequency and other controls effect. That include the mike steps. So you can use the mike click, but there is no good way to work with both TX and RX. The clicks get spread between them. Back in the packsat days, I set the uplink and left it alone. Then I switched to the RX and let the AMSAT-TAPR interface do the frequency tracking. The DSP-2232 would also work, though only for 1200 baud.
Alan WA4SCA
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Ryan Caron Sent: Wednesday, March 24, 2010 5:48 PM To: [email protected] Subject: [amsat-bb] FT-726 automatic Doppler control?
Anybody ever rig up automatic doppler tuning to a FT-726? Without a CI-V interface (or equivalent) the best idea I can think of is splicing a microcontroller in to push the up, down, and maybe the fast buttons on the microphone during a pass.
Then I'd just have to dial in the initial frequency before the pass starts.
73, Ryan KB1LKI AMSAT #37207 _______________________________________________ Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
_______________________________________________ Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
I've done this very thing! I published details in OSCAR News 184, December 2008, page
It uses a very cheap PICAXE 08M chip, which interfaces via the COM port on the main computer. The program on the PICAXE is trivial. The difficult part of the project was to interface the COM port with SatExploer tracking program. I've no idea what would be involved with other tracking programs.
A temporary package containing the source codes for both parts are on my website www.g3cwv.co.uk/doppler.htm
I can e-mail a copy of the original article & circuits if needed.
BTW I've got a related question about doppler tracking which I'll raise in a separate thread.
73 Clive G3CWV
Hitchin, North Hertfordshire, UK
Ryan Caron wrote:
Anybody ever rig up automatic doppler tuning to a FT-726? Without a CI-V interface (or equivalent) the best idea I can think of is splicing a microcontroller in to push the up, down, and maybe the fast buttons on the microphone during a pass.
Then I'd just have to dial in the initial frequency before the pass starts.
73, Ryan KB1LKI AMSAT #37207
participants (4)
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Alan P. Biddle -
Clive Wallis -
Jeff KB2M -
Ryan Caron