[time-nuts] cheap frequency extension for timepod

[Bob kb8tq]

Hi

I’m not quite sure I understand the "2 DIL 80 MHz-oscillators” part.

If you have the power divider, isn’t one oscillator going to do the job?

=====

Isolation between the two channels can turn into a bit of a nightmare …..

Bob


> On Oct 17, 2020, at 8:59 AM, Gerhard Hoffmann <ghf at hoffmann-hochfrequenz.de> wrote:
> 
> 
> 
> I'm trying to make a quick frequency extender for a timepod.
> 
> 
> MCL PSC2-1 power divider, 2* SRA-1  7 dBm ring mixer, 2 DIL 80 MHz-oscillators
> 
> The oscillators can drive the ring mixers with just a coupling capacitor and 50 Ohm
> 
> load limiting resistor. It is still a square wave at the LO port, but the diodes in the mixer
> 
> would square it up on their own.
> 
> 
> When there is no 5V-power, the oscillators are off and the LO inputs are connected
> 
> to SMA connectors via the normally closed contacts of two reed relays.
> 
> Then the whole thing is passive and needs two external synthesizers.
> 
> 
> Before I continue with the material I had in the junkbox, a quick question to those
> 
> of you who have done that already:
> 
> 
> Are 7 dBm mixers like SRA-1 good enough or is 17 dBm an advantage worth the
> 
> driver amplifiers? The usual signal generators max out at 13 dBm.
> 
> I have 2 17 dBm SRA1-WH, but it would require slaughtering something unimportant.
> 
> 
> How close must the oscillators be in frequency?
> 
> 
> Have a nice weekend,
> 
> Gerhard, DK4XP
> 
> 
> 
> 
> <stereo_downconverter.png>_______________________________________________
> time-nuts mailing list -- time-nuts at lists.febo.com
> To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
> and follow the instructions there.