[Premium-Rx] IF conversion unit - help requested

[GandalfG8 at aol.com]

In a message dated 02/02/2009 18:11:22 GMT Standard Time,  
michaelob666 at ntlworld.com writes:

Inside  is a HC-6U crystal on 3550 kHz, a ferrite potted inductor resembling
a mini  "Vinkor", a MCL SRA-3H quad mixer package, quite a few BC107
transistors  (difficult to read).  Two of the transistors are enclosed in a
small  heatsink made up of a solid lump of metal and a third has the usual
wriggly  circular slip-over heatsink.   I guess these are for LO  injection.
There are also the following chips

SN 54132J
SN  54175J
5474J (Texas Instruments).

According to my old Mini-Circuits  catalogue the SRA-3 requires a +7dBm LO
injection and covers the range 25  kHz to 200 MHz.  The LO to IF and LO to RF
isolation is about  60dB.



----------------
 
Hi Michael
 
I can't help with any specific info about the unit itself but think you  
might find the SRA-3H requires +17dBm drive.
Use of the "H" suffix to denote this drive level is common with  MCL mixer 
part numbers.
 
regards
 
Nigel
GM8PZR

 
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