Hello, I heard GB3MCB several weeks ago twice from eastern Dartmoor from a high site once by snow scatter and on another occasion on troop. Will check again soon. 73, David G4GLT.

Hello All, I enclose a copy of the email I got from Gianni (I7PHH) of Prosistel Rotators which certainly clarifies their position regarding rotary encoders and the replacement of pots: Hi David, nice

Hi Dom and others, Thank you very much indeed for all your comments about the SPID. It makes the Prosistel sound positively good despite its problems! 73 David G4GLT

Hello Dom, Connected in series it would reduce the high current on switch on but connected in this way does it also reduce the interference? 73 Dave G4GLT I am thinking of getting a SPID for portable

VDR = Varistor I think David G4GLT

What exactly is a VDR? voltage dependent resistor? David G4GLT

Thanks Steve, that’s great. David G4GLT

Hello, I am keen to calculate a path loss for a particular path. I looked online and there were free programs. Which program would be recommended as easy to use? Many thanks, David G4GLT

Hello Keith, I have one of the same. It will work well with a 0.6 f/D ratio according to Chris in an email to me. 73, Dave G4GLT

As it happens I had a blue PCB Chinese adjustable voltage doubler with a voltage readout , an inductor and 1000uF of capacitance and this adjusted easily to 16v and switched the relay perfectly withou

For anyone who was curious how I got on with the waveguide relay. On inspection inside there were stops but they were not obviously adjustable. I got myself a variable power supply and on increasing i

Thank you John and Nick, Thank you for your input. The electronic compass makes a great deal of sense . Currently I use a hand compass all the time. I will look at the RFHamdesign website. 73, David G

I am debating which azimuth elevation system to have for portable work and though the Prosistel rotators are well used and liked this pot replacement problem seems inevitable. What other rotator make

Hi Paul, That is very helpful. I will take a look at the stop adjustments. 73 David.

Hello Rainer, Thank you for your suggestion. I will try to find some data on it, but the seller says it’s 12 volts so will check that out. 73, David G4GLT

Hello, I recently bought a Micronetics 11155 10ghz waveguide relay from a Seller in the US. On testing it today on 12volts the relay does switch but does not quite complete the movement leaving about

Looks like DB6NT still makes the 10-12ghz multiplier board , though you would have to get the circuit diagram and populate it with components. Dave G4GLT

I was given some WR137 (WG14)waveguide (int dia 34.5 x 15.5mm) which is stated as being for 5.85 - 8.2ghz. I have straight bits and some bends. These are free to anyone who is interested (carriage onl

Test only

Thank you Steve . Yes, I did see that feed horn from the Italian amateur but didn’t see his page on EBay. It will do the job so have bought one. All the best, Dave G4GLT