HP8922B gsm test set

[mw0uzo]

Nabbed this on ebay for £100, untested.

HP8922 GSM Test Set
http://s18.postimg.org/evq395f85/SV203804.jpg (http://postimg.org/image/evq395f85/)

Spectrum of 14MHz carrier modulated with 2kHz sin wave
http://s18.postimg.org/f9w0mhoph/SV203807.jpg (http://postimg.org/image/f9w0mhoph/)

Its a spectrum analyser 5Mhz-1Ghz, RF generator 10Mhz-1Ghz, AF generator, power meter and signal analyser. It can do AM modulation and FM demodulation.

Thankfully it all works perfectly and seems to be well calibrated.

Its one downside is that its minimum center frequency is 10Mhz, and the analysis span is also 10Mhz. So you can analyse down to 5Mhz, but you start to lose resolution as you have to increase the span to get there.

It has a 30W maximum RF power input.

I need to make something to get the 0-10Mhz that is missing. Does anyone have any experience with very low distortion mixers suitable for doing this? The additional problem is maintaining a 30W input, so there would have to be an attenuator and a mixer calibrated to put a signal into the low power auxiliary input.

Any thoughts?

[X-Rated]

Toe tall E ki Kass.

Great find. DX will never hide or get away now.

[mw0uzo]

Toe tall E ki Kass.

Great find. DX will never hide or get away now.

Its been used to adjust BPFs on a friends qrp rig so far and look at the output of a few radios in my shack. Not used it to inspect the output of the eb104 yet though, not sure if I want to open that can of worms....! It's not straightforward as the input is limited to 30W. I'll probably take a tap off the internal dummy load and put through another attenuator, then I'll be able to view the output.

I attached the IF out of my ts850 to the analyser briefly, could see various signals, but the refresh rate is about 0.5s so not really suitable for viewing ssb.