Mod to disable AGC in FT-847
Hi,
A couple of times over the years, there have been requests for a way to disable the AGC in the FT-847 for things like noise measurements. I came across a modification here http://www.frenning.dk/OZ1PIF_HOMEPAGE/FT-847%20AGC-Off%20Mod.htm which is reported to do that.
Alan WA4SCA
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Alan P. Biddle expunged ([email protected]):
Hi,
A couple of times over the years, there have been requests for a way to disable the AGC in the FT-847 for things like noise measurements. I came across a modification here http://www.frenning.dk/OZ1PIF_HOMEPAGE/FT-847%20AGC-Off%20Mod.htm which is reported to do that.
The pictures provided there also show how the crystal INRAD filters should be installed. I literally just came back from the post office with a box of INRAD filters for the 847 :)
Thanks!
-Steve N1JFU
AND it looks like he has the crystal heater on it, too. Jim KQ6EA
--- Steve Meuse [email protected] wrote:
Alan P. Biddle expunged ([email protected]):
Hi,
A couple of times over the years, there have been
requests for a way to
disable the AGC in the FT-847 for things like
noise measurements. I came
across a modification here
http://www.frenning.dk/OZ1PIF_HOMEPAGE/FT-847%20AGC-Off%20Mod.htm
which is
reported to do that.
The pictures provided there also show how the crystal INRAD filters should be installed. I literally just came back from the post office with a box of INRAD filters for the 847 :)
Thanks!
-Steve N1JFU
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
...into the document I read that the resistor is 560 Ohms, but onto the foto seems to be... 56 Ohm (green-blue-black)!!! Illusion?
Just keep in mind...
73, Mak SV1BSX
--- Jim Jerzycke [email protected] wrote:
AND it looks like he has the crystal heater on it, too. Jim KQ6EA
--- Steve Meuse [email protected] wrote:
Alan P. Biddle expunged ([email protected]):
Hi,
A couple of times over the years, there have
been
requests for a way to
disable the AGC in the FT-847 for things like
noise measurements. I came
across a modification here
http://www.frenning.dk/OZ1PIF_HOMEPAGE/FT-847%20AGC-Off%20Mod.htm
which is
reported to do that.
The pictures provided there also show how the crystal INRAD filters should be installed. I literally just came back from the post office with
a
box of INRAD filters for the 847 :)
Thanks!
-Steve N1JFU
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
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As Mark points out, in two places he writes 56Ohms, which judging from the picture should be 56 Ohms.
The top of this is actually http://www.frenning.dk/oz1pif.htm which has some other interesting references, and the e-mail for OZ1PIF should you have questions. I got the idea to bring out separate RX lines from Peter years ago.
Alan WA4SCA
participants (5)
-
Alan P. Biddle -
Alan P. Biddle -
Jim Jerzycke -
Steve Meuse -
SV1BSX