heath robbinson panadaptor idea

[p.larner]

I have a cheap chineese sdr reciever like this one https://www.aliexpress.com/item/1005003954483936.html?spm=a2g0o.productlist.main.1.25b2290aNK2I7n&algo_pvid=160734b4-a329-47e2-9279-f9e7246bfcf0&algo_exp_id=160734b4-a329-47e2-9279-f9e7246bfcf0-0&pdp_npi=4%40dis%21GBP%2114.66%2114.66%21%21%2117.94%21%21%402103890917018769376058822e5da7%2112000034890967339%21sea%21UK%212308464272%21&curPageLogUid=ZLK588cpURc8
i also have an old yaesu ft 707 txcr,can i tap the if and feed it into the sdr antenna and use it with sdruno as a bandscope/panadaptor?
the sdr is a RSP1 Msi2500 Msi001 SDR Reciver 10kHz-1GHz /10kHz-2GHz

[Andy Chee]

Yes, it is possible to tap the IF and feed it into your SDR. 

For example: https://swling.com/blog/2015/12/how-to-use-the-sdrplay-rsp-as-a-panadapter/

[p.larner]

it says this in the service manual: The RF signal is fed to the Schottky barrier diode
ring module, Q1008 (ND487C2-3 R), where the RF
signal is mixed with a local signal delivered from
- -- --·------ --- -·-
91012 ( 2SC2407 ) ,
_
resulting in a first IF of 8.9 875
MHz. The input and output of the diode ring are
protected by 50 ohm attenuators, which stabilize
the input and output terminations for optimum
intercept characteristics. The IF signal is then
amplified by mixer post-amp Q1009 ( 2SC2407) and
fed to pin 5 of J 1 0'01 for delivery to the IF Unit.
so do i pick off the if sig from pin 5 of j1001 then?

[Andy Chee]

Remember to use a high impedance buffer on your IF tap.

For example: https://hamwaves.com/sdr/doc/z10000b-u.v1r02.manual.pdf

[Hamelec]

..or a resistive power splitter.