No beacons here for a couple of hours at least. The satellite appears to be fully functional though.
73 Dave
No beacons here for a couple of hours at least. The satellite appears to be fully functional though.
73 Dave
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I just want to renew and pay online.
Dave
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I sincerely appreciate all the hard work done by AMSAT-DL and last year subscribed and paid 120EUR gladly.
I have by post received a renewal form. I am sorry but I cannot read German and of course Google Translate won't work on paper documents.
Is it possible to resubscribe on line in English please ?
Thanks
Dave G4IUG
Or just buy a 0.1ppm TCXO ?
Or a frequency counter; counting its own reference ?
I would have thought that almost any TX chain would be stable enough ? YMMV
Why would you need to do that ?
OK, that looks good. More of the same but better and an L Band repeater ??
Thanks
Dave
I hear there is a new Paypload of Ham Radio equipment for the ISS ?
Does anyone have any info on this ?
73
Dave
I like it just as it is. Can't think of anything else to say apart from well done chaps !!
73 Dave G4IUG
Wow ! What is it ?
Guys
My receiver Narrow Band IF is 145Mhz with an Icom transceiver. What I would like is a fixed Waterfall Display with a moving cursor from the Icom radio. So that I can look at the whole band on the SDR and tune to anything with the Icom.
Is this possible with a Raspberry Pi ?
Thanks
Dave
There is so much miss-information and confusion here.
Dave
the ebay picture shows even 5dB, whatever this number means).
That is not its loss.
Dave
It is not because it is a square wave. You need to look at the source on an analiser and on the input and output of the on-chip oscillator gate.
73's
Dave
well almost as they don't radiate towards the horizon but from about 20 degrees and up. The concept remains and not seeing the horizon is often good for noise rejection.
Mike
But that is exactly what the OP did not want, and worse than my QFH suggestion ??
Perhaps you should consider an Isoflux antenna?
Do these go 180 degrees and down to the horizon maintaining their circularity ?
OK, if you look into the design of QFH's you can optimise them. On our 137Mhz weather satellite version we deliberately cut off the first and last 10 degrees to kill terrestrial man-made noise. This gave us maximum s/n over the majority of the pass which is what we wanted.
It is going to be a challenge to get horizon to horizon gain and circularity. There are antenna design books somewhere here, I'll try to look them out ?
BTW I remember UoSAT well, we had a license from James Miller G3RUH for his data correlator and we supplied complete receivers to the Surrey Ground Station. Those were the days ! And unexpectedly I met James at the RSGB Convention a couple of weeks ago, the first time since 35 years....................
I have the experience, but not the ability to read German. My company Timestep, once made one of the most expensive QFH's for Super Yachts and low cost crossed dipoles for amateurs.
Most antennas of all these types do not work properly.
A QHF with the correct phasing does work and has no nulls or polarisation changes. However most home brew QFH's do not work due to construction issues.
Peter, what exactly is your question and application ?
Regards Dave