Callsigns: GW3TKH/P & GW4HQX/P Locator: IO81LS19 Cefn Y Galchen Bands: ('TKH) 24GHz 0.5W 45cm dish, 47GHz 50mW 30cm dish, 76GHz ?uW 34dBi lens horn + G8CUB beacon tx. Bands: ('HQX) 47GHz 100uW 30cm

Is SEE off again ?

AMSAT-NA have already announced plans to launch a 5 GHz to 10 GHz amateur transponder payload into a Geosynchronous orbit https://amsat-uk.org/satellites/geosynchronous/na-gso-sat/ In addition they

With the last of the millimetre cumulatives contests this weekend. It has fallen on me to compile a list htis time. Please send details of your planned operation in the following format: Callsign:

I would argue that COFDM is not a way to improve weak signal performance. COFDM and all the related modulations have as a prime aim to optimise bandwidth usage in defined channels and make the best

Hi agn , the Constant amplitude ssb modulation system did not raised comments it looks: http://www.ve6aqo.com/images/roel030406_beacon/PAoJTA%20PLL%20SSB.jpg It can be done in software in a sdr

fully agree to this statement, as the number of active Microwavers steadily increase, we must pay more attention to the signal purity of LO`s and PA`s on our microwave gear. 73, Wolfgang, OE4WOG

Hi agn , yes , I think it's never a good idea to say : let's go dirty , it would'nt hurt anyone. The exemple I took with RS can be extended to tropo as well. The activity level on 3cm

FWIW, I accept that running an SSB transmitter well PA into compression isn't likely to cause the world to stop turning! However, I prefer to try to run my SSB transmitters linearly, rather than waste

Of course when RS signals are that strong who can tell what the SSB sounds like anyway? Time to go CW.......narrower. Or go FM? 😊 73 de Sam, G4DDK

Hi , looks like we don't live in the same galaxy, I can tell U we care , during a RS opening there are something like 10 stations on the band and some with absolutely outstanding levels During a good

And do we really care about the sidebands on an SSB signal on 10GHz? Even in the biggest events from a hilltop site , you're unlikely to hear more than two stations simultaneously. Back in the

Hi all , what about constant amplitude ssb? It was promoted a long time ago , and was sadt to be very interesting too for high bands microwaves at it was possible to use a varactor multiplier with a

Hello Neil There is a third alternative to linearising PAs. It's quite possible touse an analogue lineariser to compensate for PA non-linearities. Itdoesn't work as well as adaptive linearisation, as

Sorry to report the beacon is off air at the moment while the batteries get recharged. We need some serious sunshine and/or wind! Will advise further. Graham

I am thinking in terms of milling a 5mm deep bathtub in a slab of copper, then using one of the small CNC mills to machine a simple PCB shape (have to embed it on a wax base or something),

(This email became truncated when sent via my webmail server. Better luck this time, I hope!) A couple of points regarding GaN devices and SM mounting of small power parts. Firstly, the saturation

Hi all, I'm QRV on 9cm again from JO02cg if anyone would like to try a QSO? Copying GB3MHZ, GB3OHM, GB3SCX and occasionally G3LPC beacons Running about 15Watts at a dual dipole feed, offset slightly

A couple of points regarding GaN devices and SM mounting of small power parts. Firstly, the saturation characteristic of the generation of devices including the TGA2760 is such that they do not

If you think these PAs have potential for the masses, it may be worth getting a PCB made to order and passing on teh rest to other people at cost. There are a number of low cost suppliers out there