Hello All!!
I made test with the item...
I disasemble the CMU200 and then before installation the SA keep working.. no trace in screen..
It appears that the TXRX board is not settle in place.. Then It worked again
So I put out the screening and Put the connector in place, only worked in the place that says Brainbox.
I put the BNC Bulkhead connector in the front plate in the Audio output conector. Then I put the Bulkhead of the audio signal in the rear panel of the unit.. No problems so far..
I put 12V at board and connect the board with little microwave sma cable.. I put 3dB pad after TG generator and adjust to obtain flat response. You can see in the photos...
Then I take a 10.7MHz crystal filter 25KHz BW i cannot remember...
You can measure about 20KHz BW..
It works a treat..
You can compare the trace with a Rigol TG.. The response is practically identical.
At 100 Hz the noise floor of the R&S is about -100 dBm..
The interface of the R&S is poorer than RIGOL, but it works..
P.D: I try to use 1916.2 MHz with the second internal generator to use the first generator at 100MHz with an input mixer and to sweep from 0 to 1.2GHz... To test 455KHz Ceramic Filters...
BUT, It doesn't work because the BG7TBL design is using a filter post mixer that have a high frequency passband above 10MHz and the signal below 10MHz is greatly attenuated, so it doesn't appear in the screen....
I think also the mixer cannot work at these low frequency..
I would use a two mixer configuration to translate to 0 MHz..
Regards
Manuel