[time-nuts] RF mixers for oscillator characterization, some questions

[Arnold Tibus]

Hej Magnus, 


On Mon, 20 Apr 2009 01:06:57 +0200, Magnus Danielson wrote:

>> 
>> Did somebody alredy look inside the metal case of the 10514A?

>You made me remember I needed too....

>>  Will it perhaps possible to reconnect the common ground connections
>> such a way that the mentioned loops can be opened?

>Yes. The grounds is separated on the PCB, so it is only on the front 
>plate that they actually interconnect when the BNCs screw tight.

>What's inside then?

>Well, there is 4 small torroid cores (as compared to the 10534A which 
>has only two cores). It also has 4 diodes (marked as HP 82) and 2 50 Ohm 
>resistors.

>The L and R ports have an isolational transformer each, with the 50 Ohm 
>resistor loading on the secondary side. A inner transformer then 
>follows, with two secondaries, hooked up like expected for a double 
>balanced mixer. Essentially this is a double balanced mixer with 
>additional isolational transformers and 50 Ohms terminations.

>This does not match the datasheet from MiniCircuit for ZP-10514:
>http://www.minicircuits.com/pdfs/ZP-10514.pdf

>Cheers,
>Magnus



thanks to your response the informations went deeper into very 
informative details, so I know what to do. 
I will take one of these relay metal cans and have a critical inside look... 
For the moment I am fully satisfied, 

thank you to  everybody,

Arnold