9cm Weeknight activity

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G4FRE
Posts: 197
Joined: Fri May 26, 2017 6:57 am

9cm Weeknight activity

Post by G4FRE » Wed Mar 23, 2022 4:12 pm

On 21 march I ran some DATV tests on 9cm with G4XAT/P at IO92GD. The path plotter prediction showed that it was not quite LOS but worth a try. I was running 4W of DATV from my Portslang4 acting as an IF for a DB6NT transverter with the under-run 15W Toshiba amp. The antenna was a 15dBi steel horn

Gareth's signals were huge. The best MER seen at 333kS was 30.8dB (while a plane took off from his end of the path) but were normally 28dB. 2MS had a MER of 20dB but allowed good quality moving pictures
Path Profile
Path Profile
gareth_plot.jpg (45.08 KiB) Viewed 3736 times
Indoor setup (pointing East)
Indoor setup (pointing East)
antenna.jpg (492.04 KiB) Viewed 3736 times
333ks 27.9db MER
333ks 27.9db MER
snap45.jpg (81.21 KiB) Viewed 3736 times
Nice clean received Spectrum
Nice clean received Spectrum
snap17.jpg (111.34 KiB) Viewed 3736 times
2MS 20 dB MER
2MS 20 dB MER
snap57.jpg (70.87 KiB) Viewed 3736 times
We also tried narrowband. 2 way nbfm was easy!

Thanks to Gareth for going out and enduring the cold

After working Gareth I had a 2nd QSO on 9cm DATV , this time with G4NZV. More callsigns worked on a weeknight on 9cm than in the whole IARU contest!

radiogareth
Posts: 1215
Joined: Wed Jan 06, 2016 9:46 am

Re: 9cm Weeknight activity

Post by radiogareth » Sat Mar 26, 2022 2:19 pm

A great late afternoon/evening with very pleasing results too. Everything worked as planned, the Toshiba amp did great service sending RF in exchange for about 19A/Hr from my leisure battery. Thanks for posting the signals etc. I was amazed to see your NB peak at over 5/9+40dB! 2K SR both ways was virtually instant lock too. Both my Portsdown 4's/Pluto/Mini-Tiouners were faultless all evening too, not a single re-boot needed.
I'll be going back to the Warwick area on the weekend of our next activity weekend, if anyone knows of a good site for car based /P on top of the Chilterns (not too far off the M40 is possible) I can head there Saturday late afternoon/early evening again, with 70cms, 23cms and 3.4GHz. Sunday I plan to be at Burton Dassett again all day, assuming others will be around to play. Can also load in 5.7GHz as that is all compact stuff too.

Open to offers...

Gareth

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