Robin, I think that this is a rather muddily article. He seems not to have understood the subject. Time does not permit a fully reasoned reply at the moment but I hope to get back to it sometime. 73 P

Neglecting losses in the cable where does the reflected power go? Surely it will depend on the match between the source and the cable. If well matched at the relevant frequency it must be absorbed by

Hello Chris, Thinking about your comments and the fact that many surplus amplifiers have one or more circulators, I was wondering if the circulators will help tame the amplifiers. Circulators will usu

I wonder if anyone can help. I have heard demos of noise reduction devices and they seem to make moderately strong signals more pleasant for ragchewing but I have not heard a demo where a very weak si

Have you looked at this? https://www.ebay.com/itm/Spinner-754001-4-Way-RF-Microwave-Coaxial-Switch-24V-for-Satcom-Plasma-Generator/264706378085?_trkparms=aid%3D1110009%26algo%3DSPLICE.COMPLISTINGS%26a

I understand that hotplates are useful when soldering RF power devices to large lumps of copper heat sink. We have a a basic electric grill modified to fit a fan on the back and a "K" type thermocoupl

Hi Chris, Pity you are so far away (280km). I have a 24GHz system that needs repair - it has a lock issue. I trust you are keeping well. 73 Paul G8AQA

Thanks to everyone who replied. Most helpful. I now have the tower here and am at the drawing board sorting out the steel for the base plate etc. The plates will be laser cut as it is cheaper than buy

Thanks Conrad, People have been very helpful and I shouldn't need you to go and measure it. Didn't get very far in the contest as I have a couple of hills in your direction. One would be bad enough as

Thanks both for the warnings about the weight. Fortunately I am familiar with handling heavy lumps at home. The worst was unloading some roofing sheets which on a pallet weighed a tonne. The next door

Thanks Martin, Yes I have seen this but unfortunately it does not give dimensions for the bigger tower. Yes the Westower is very different with a 6 bolt mounting. 73 Paul

Can anyone help me with the dimensions of the baseplate for an 80' HD versatower. I need: Base widths and thickness, Triangular fillets (I think there are two sizes) long and short edges and thickness

Hi Robin, I made a pipecap filter for 3.6214 Ghz It was quite narrowband and had an approx 3dB loss. You can play with loss and bandwidth by adjusting the probes. I have a bag of 28mm pipecaps here if

Heather M0HMO has written KST helper which lists stations by distance and removes stations already worked. She has also written a mapping program which uses open street maps which is free. It zooms fr

Anyone want to make their own as long as is is smaller than 4.5m in one piece? https://www.ppauctions.com/assets/auctions/attachments/Flysheet_249077370.pdf Paul G8AQA

Hi Chris, It sounds like a plausible idea and with the apparently simpler processing it might gain some traction. I would note that tunnel diode logic was being tried in the late 60s at Martlesham. I

I am with Andy. JFDI and start talking about something interesting like radio. Paul G8AQA

I am currently coveting an Elad FDM Duo. G4DBN is a great fan. The display would be best on a computer. 73 Paul G8AQA

I trust you will look at the thermal calculations as you propose a board of double the thickness and half the conductivity of the .01" Rogers 4350. The heat has to pass through the plated through and

Hi Robin, Have you a supplier for the devices? What board material had you in mind? If you are thinking of mounting the board in a milled out channel I can supply screw in SMA connectors FOC. 73 Paul