Hi David, Sent you a PM. I have some relays that should suit Mark GM4ISM

Hi all Just found a thing worth noting about JLCPCB There are some limits to the number of holes in a board you get for free! 100,000 per square meter.. that's only 1000 holes on a 10 x 10 cm PCB No p

Thanks John and Geoff It does look like the LO. The DC monitor points associated with each stage all indicate decreased current as the system warms up. A bunch of BFP196s are on order! haven't checked

Hi All My old G2 transverter has developed a fault From cold all is normal, about 150mW output (correct for my system). As it warms up (this is without being in continuous TX) the TX output power drop

differential GPS, it has 2 GPS antennas (admittedly not far apart)

Andy, all I don't have the bandwidth to help at the moment but what Mareck needs is quite practical 1W into a 14dBi antenna at 40km in 30MHz bandwidth LOS is about 29dB SNR. If he went digital there m

I use Kicad. Quite a steep learning curve but worth it. I always use a schematic, it transfers to the pcb layout program and ensures that everything that should be connected is and that there are no e

Hi David you could try the HP test equipment io group HP-Agilent-Keysight-equipment@groups.io On 02/07/2022 16:02, DAVID G4ASR via groups.io wrote:

I've only used JLC PCB but the quality and service have been outstanding. I have also taken advantage of the SMD assembly option and this is s real win IF they have the components in stock. Minimum is

Hi All I have a couple of Plisch '50W' analogue TV amplifiers available + spares tubes and accessories, free to a good home. It is reported that powers in excess of 300W can be achieved at 23cm with t

Another potential factor for amateur use is that the squat oval sky dishes that I have require an asymmetrical feed for optimum illumination. Mine has what can best be describes as cut-outs in the end

Hi Mike, all Others have posted the link to the SHF firsts Looks like I may have to claim some of those GD firsts from my visit last year! GD4ISM/P to G4CBW on 6cm I also worked GM4DIJ/A and G0HIK on

I thought it was being used for 1700MHz weather satellites? If it is ,I may have a suitable filter (but not small!) Filter after the 1st Rx amp would be best if it has a sufficiently robust demeanour

Its pretty straightforward to use excel web import on the beaconspot data you get an excel sheet with all the data in nice columns, per band You do have to log in If you want to know how to do this, c

Hi Mike Yes I have you down for an antenna I'm just collating info on the 2 types because there are not enough of the higher power ones for everyone. Some however may want the lower power units, the m

The chances of these working are very much reduced because the device body is floating rendering them very vulnerable to mechanical damage ( the connection spills are very fragile) and static electric

Hi All I have retrieved all the intact ex 5.8GHz link large 'WiFi' antennas and have just finished testing them. I got a couple of the smaller antennas to investigate too. Most of the large antennas w

My observation of rainscatter on 3 and 6cm is that they are similar during heavy rain but there is potentially another factor. Some years ago I did some tests to assess scattering on 3cm with differen

Gareth Quick and dirty paintshop sketch of my proposed use of this Mark GM4ISM

Looks like a simple starpoint to me.. In a starpoint diplexer, the split is nominally lossless at each of the Rx and Rx frequencies The stopband of each filter provides a near perfect reflection (of p