[hpsdr] <hpsdr> SB104A Power Amp

[hb9ajp]

Hi Jeff

thats exactly what I did: I modified my HW-104 in order to use Driver  
and PA with Penelope. I used antenna switch 5 to switch from internal  
to external exciter and used J12 (receiver antenna) to connect  
Penelope. So the output of Penelope is connected via a manual  
attenuator through J12 and switch 5 to the Driver Circuit Board J 2/3  
(RF in). As I do not use the ALC control I had to carefully adjust the  
output power of Penelope. The PTT switch of the HW-104 has been wired  
at the microphone connector. To switch the antennas I used the open  
drain FET on J6 pin 13 to control a T/R relay as already has been  
proposed. As my Mercury has not yet arrived I used the Flex-5000 as  
receiver. I made some qso's and the signal was reported to be nice.
As this configuration worked I tried another one: I connected the  
Penelope signal to J1 of the BPF board of the SDR-1000. This is quite  
simple as you only have to disconnect the little rf cable between RFE  
and BPF board and install a BNC jack to the "Rx 144 MHz" hole of the  
back plane. This worked also well and I will probably use this  
configuration with when I get Mercury.

73, Chris HB9AJP


> Date: Sat, 03 Jan 2009 22:53:11 -0500
> From: "jkelly" <jkelly at bellatlantic.net>
> Subject: [hpsdr] SB104A Power Amp
> To: <hpsdr at lists.hpsdr.org>
> Message-ID: <7B1DA3B8A2424708A410DAEAC7435DDE at JeffPC>
> Content-Type: text/plain; format=flowed; charset=iso-8859-1;
> 	reply-type=response
>
> I am intriqued by the idea of using an amp module from an older rig
> in storage in the shack for a HPSDR power amp.
>
> I have a working SB-104a laying around and taking a quick look at  
> the boards
> it looks like it might work out.
>
> Here is a top view photo:
> http://mysite.verizon.net/jkelly/ham/SB104-3.jpg
>
> This is a little out of my league but would appreciate any comments on
> whether this could work with Penny and any ideas to get started.
>
> thanks,
>
> Jeff
> KT2K
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