Re: [amsat-bb] IFD board and the FT-736R

[Roy Welch <rdwelch@xxxxxxxxxx>]

Bill, have you determined that the xtal in the IFD is indeed oscillating
and producing  a signal at the injection frequency.  Listen for it or a
second harmonic, etc. on a local suitable receiver.

Also, check to be sure the +DC supply to the IFD has a ground return from
the IFD board so that it is actually running.

Bill Hurlock wrote:
> 
> Would anyone that has installed a Symek IFD board in there FT-736R
> please comment on how the install went and if they found the board to
> perform according to the specs that came with the board. I have not had
> any luck installing the board and have returned it only to find that
> there was no problem found with it when it was checked out at Symek. My
> 736 is working OK and have no problems with it in normal operation. The
> install went as directed. When checking the the data output it is stated
> in the doc's that about 2vp-p of noise should be present. I am only
> observing about .2vp-p on a TEK scope. The only way I can ever get data
> to appear on the data output is by tweaking L44 and than it is very
> critical. I have also noted that where the 736 shows the signal is
> centered on the demod meter the IFD centers half a meter scale lower for
> its center signal. Voltages listed in the doc's do seem to agree closely
> with those measured on my board. Other things observed are the RSSI
> signal will not come close to the .1volt mentioned in the check out page
> in the doc's. When receiving a 38.4 signal I can't see any EYE signal at
> all and the percentage showing on WISP is only around 4% if that. I have
> been able to get higher %'s on 9.6 which I understand is lower on output
> because the IFD is setup for the higher data rates. The comments I have
> gotten so far suggest that tuning of the rig and of the IFD itself
> aren't that critical. I am connecting to one of the TNC_3S tnc's from
> Symek with a 9.6 and a 38.4 modem in it.
> 
> WA2TQI Bill
> 
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-- 
73, Roy

Internet: w0sl@amsat.org
Home Page: http://home.swbell.net/rdwelch
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