|From: David Woodward [email@example.com] Sent: 07
March 1999 17:32
To: Peter Day, G3PHO Cc: firstname.lastname@example.org
Subject: 47GHz Tests
Today (Sunday 7 March 1999) Martin G7MRF, Paul G0HNW and myself,
David G0IVA ,(assisted by Vinny G7OKU) ventured out to have a go on 47
GHz. The weather at our respective homes before setting out was not very
Paul set up at Bradwell Moor, near Castleton, IO93CH (SK143794) and Martin and I set up near Merryton Low, IO93AD (SK040613). Paul has not finished his 47 GHz transverter yet but is able to generate a signal using his 24 GHz gear and a multiplier at the dish feed. Martin and myself both had complete transverters (DB6NT - Martin's using 1296 MHz IF) - with a best dx so far of about 50 feet!
After using 24 GHz for alignment, 'MRF and 'IVA were both able to receive 'HNW's signal at 59+. Paul was able to transmit NBFM and crossband 144/47GHz QSOs were completed easily at approx 21 km.
G0IVA then relocated next to G0HNW on Bradwell moor ('MRF staying at
Merryton Low) and and after using HNW's signal to net onto, 'MRF and 'IVA
were able to complete on 47GHz two way with 57 signals (SSB and NBFM
One interesting thing noted was the back scatter from the snow/sleet when 'IVA was listening to 'HNW's signal. The two dishes were beaming the same way, but spaced about 70 feet apart. The backscattered signal was a similar note to rainscatter signals on 10 GHz but with relatively light snow/sleet at the time. Shielding the main beam of the dish killed the backscatter signal but I could then just hear nice note from 'HNW direct. This initially caused some concern as I thought my LO had suddenly become very rough!!
No further tests were made as the weather was very poor and some of the higher roads were closed due to snow.
We will have another go soon to try and extend the distance a bit -preferably in better weather!
Design and Construction Article: DUBUS TECHNIK IV pages 359 to 365
Purchase of Kits and/or assembled modules:
Europe - http://web.aurecvideo.fr/infracom/db6nt.html
USA - http://www.ssbusa.com/
Worldwide - Email
DB6NT for his excellent microwave catalogue and order form. He now
accepts Visa and
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