[hpsdr] Yaesu Amp

[Mike F]

Hi Steve

I was catching up on my HPSDR messages and saw your post about Yaesu 
power amp/Filter assemblies.  I have adapted the PA/Filter assembly from 
a FT900 for use with my HPSDR.  The adaption was extremely easy.  All 
that was necessary was one relay to perform the PPT function and two ICs 
to decode three lines of the programable control lines from Penelope for 
LP Filter control.  The TR switch is also part of the assembly.  In The 
FT900 the 9 volts required for transmit (PA) enable is actually 
generated in the PA, so no other voltages were required.

On the FT900 the top cover contains the above components, so packaging 
is basically done.

The 900 PA has outputs used by the auto tuner for forward and reverse 
power.  Penelope has inputs for these.  My next step is to measure what 
the voltage levels are from the PA and adjust as necessary for Penny to 
read and psdr to display.  I have considered trying to also adapt the 
auto tuner.  However, I have not yet tackled the problem of figuring out 
how much the FT900 main controller is involved in the auto tuning 
process.  There is also a auto tuner controller, but I haven't started 
figuring out the division of labor between the two.

My Penelope was one that was assembled with the output transformer 
reversed.  I believe it causes the PA not to be driven to full output on 
20 meters.  60-65 watts max.  However, it will more than drive to full 
output on 80 meters (I briefly saw about 150 watt from the 100 watt PA). 
  I plan on getting a new transformer and then trying to reverse the 
installed one without melting it.

Let me know if there is anything else I can do for you.  I have a rough 
schematic of my logic decoding circuit.

Thanks

Mike Fager, K7SR

On 3/28/2011 2:20 PM, hpsdr-request at lists.openhpsdr.org wrote:
> Message: 11
> Date: Mon, 28 Mar 2011 10:47:48 -0500
> From: "Steve Nance"<snance at charter.net>
> To:<hpsdr at openhpsdr.org>
> Subject: [hpsdr] Yaesu Amp
> Message-ID:<006001cbed5f$7d50bb70$77f23250$@net>
> Content-Type: text/plain; charset="us-ascii"
>
> Has anyone taken the amp and filters from a Yaesu and used them with HPSDR
> (Penelope/Mercury/Metis)? I searched the archives, but didn't get any hits.
>
>
>
> I have an old FT1K MK5 (200 watt) in storage just begging to be used for
> something useful.
>
>
>
> 73, Steve K5FR
>
>
>
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