Re: 10GHz World Record
Marcustoggle quoted messageShow quoted text
Thank you for the information.
The last time I tried contacting EA8 on 1296MHz was indeed during the opening of the 3rd Sept 2013 as reported in Radcom.
On 144 and 432MHz I was running 400 watts at the antenna with 15.0 and 18.4dBd of antenna gain respectively. On 1296MHz at that time I was running about 300 watts at the antenna with 18.8dBd of antenna gain, so the three stations were quite similar in terms of erp.
I am afraid I did not take notes as to the equipment at the other end however I do remember the stations were running a lot less power on 1296MHz so I was expecting a possible one way contact using 70cms for talk back but it did not happen. The reports on 432MHz were in the 4.2 to 5.5 range so quite weak. So it could just be that the 1296MHz signals were below the threshold because of poor coupling into the duct as you said.
I am indeed at 60metres ASL and with the ground rising to 160metres 3Kms away on the bearing of 203 deg to EA8. So far from an ideal take off at this end probably causing significant extra loss.
My general observation is that the sea paths to EA8 or NW mainland Spain do tend to show a marked frequency dependence in contrast to the tropo path to HB9 where I can often move up band by band to 1296MHz with similar reports on each band.
Recent examples being 30/12/2014 and 5/1/2015 when I had 13 QSOs on 144 and 432MHz over 1000Kms to SW France and Northern Spain but no successful QSYs up to 1296MHz.
This is just anecdotal evidence and what is needed is a systematic study of beacon strengths across the different band over a long period.
With the advent SDR receivers it should be possible to monitor multiple beacon frequencies logging the signal to noise ratio against time. Has anybody tried this or know of any software to do it?
On 14/01/2015 20:06, "marcuswalden@... [ukmicrowaves]" <ukmicrowaves@...> wrote: