Speech processing

Most rigs of the modern era have speech compressors. Early radios did not, and it was vital to make sure your signal was "punchy". I well remember an article in an early VHF Communications magazine that looked at this.

See https://worldradiohistory.com/Archive-DX/VHF-Communications/VHF-COMM.1971.1.pdf .

Help needed to find a circuit please

Back in the 1970s my first outings on 70cm were using a circuit I found in a VHF Communications magazine. I guess it would have been 1971-1974 sometime. I think the magazine came out quarterly.

The circuit used a varicap diode as a tripler on TX and as a mixer on RX. The IF was 2m and on 70cm it produced about 100mW as I recall. In those days most were crystal controlled AM and on RX we tuned "low to high", or similar, to get a QSO.

Do you recall this circuit?  If you have a copy of the article I would be most grateful for a copy. 

I have no intention of building it, but it would be nice for old time's sake. From an East Anglian "hill" (yes there are a few, HI) it worked as far as Yorkshire with a very small beam.

UPDATE 1341z: Found it!! Thanks Henry.

See https://worldradiohistory.com/VHF_Communications_DE.htm .

M0ZAE was a great help - thanks again. The edition was November 1971. The link takes you to all back numbers and is a great resource.

VHF Communications Magazine

Back in the 1970s, I think I subscribed to this A5 sized quarterly magazine. It was the English language version of the German magazine UKT Berichte.

It was very good, containing lots of circuit ideas for those keen on VHF, UHF and microwaves. It inspired several of my designs at the time including a 2m-70cm transverter using a varicap diode as a tripler and mixer. It was very simple, but got me active on 70cm. In those days people were mainly crystal controlled and "tuning low to high" for replies. In those days G8s in the UK (no morse test licencees) were not allowed on 2m, so activity was quite good on 70cm.

Although I think it is now longer published, back issues may be obtained.

See http://www.vhfcomm.co.