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

[Bill Hurlock <bill@xxxxxxxxxxx>]

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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