[BC] SX1 mystery

[Mike McCarthy]

On 12/15/2011 10:55 PM, Andy Soule wrote:
>There was no 1230 transmitter at the time, so that part of it was set up with an oscillator, and that will be rechecked and everything retweaked when he comes back in a couple weeks.  New transmitter is in place and happy and when 1400 was working last week we had them both on with no issues and all the measurements for the 302 came out fine.

I would try to check the whole system thing with a network analyzer or something which can give you a reasonable approximation of the match rotation and bandwidth. Then try to re-aquire the same rotation as before. If the bandwidth is tight (and it could be for a 1230 and 1400 depending on the design), rotation could be very important.

You say that only a vacuum variable was the network before...right?  Was it a shunt feed?  This has all the making of a bad match made good and now the TX needs to be tuned to the new load.  Hence the reason to check #20 and the phase match.

Tom's comment about R-26 is also salient.

MM