[Moon-net] TS-950SDX and transverter problem

[David Anderson GM4JJJ]

On 17 Feb 2007, at 09:00, Carsten Esch wrote:
> a friend of mine is using his TS-950SDX with a DB6NT TR144H  
> transverter.
> When going to TX (CW or SSB) the transverter will put out 20W and  
> within
> seconds (3 to 4) the power will drop to 14W or so.
> When you release PTT power will start at 20W again and will drop  
> again ...
> It seems to me that IF output of the 950SDX is changing? Is someone  
> on this
> list also using an TS950?


Yes Carsten, I use the same transceiver as IF here and suffered from  
the same problem, it seems to be thermal drift in gain of the  
transmit driver stages when no ALC. I ended up building an external  
detector/amplifier to feed back ALC voltage to the TS950.

I also made some modifications to the 950 to stop the bias on the PA  
transistors when transverting.

The TS-950SDX transverter system is very poorly thought out IMO.


73
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David Anderson, GM4JJJ         E-mail: david at gm4jjj.co.uk
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