Mark, you meant IO82QL82, but I guess that is not where he will be. Ken, IO82QL77 ////////////////////////// Mark GM4ISM 10:28am #66730 Robin, what is the locator (8 or 10 digits) from where you opera

I would not dispute your results, Richard, but when I tested something that fits the same description it must have been different composition because it had no effect. A piece of cardboard was more us

So Fawley 198m gone, Ironbridge power station chimney (206m) in September and Bilsdale TV mast,305m (many happy? hours spent up that one in 1982) a couple of weeks ago. https://youtu.be/46ExySn1m54

The Leicester PCB supplier could have been "PW circuits Ltd". They certainly stock specialist microwave materials, (I had some from them once) but I can't comment on prices v. Chinese.

You should also note in respect of the Wolfspeed device you mention, all the characteristics and specifications are based on pulsed operation with 10% duty cycle. So that 50W transistor has been desig

You could use odd multiples of 1/4 wave but I suspect the bandwidth would be reduced. If you want to make it longer, use steps or a taper and the bandwidth will be increased!

Colin, What you are looking for may just about be doable. A 3 cavity filter with 9 MHz bandwidth could give 20 db rejection at 3410 MHz. The passband loss would be about 3dB. A somewhat uncertain issu

Methinks you are specifying 40 dB rejection at a frequency that is within the specified passband. Does not compute. I do not have the abilities you search, but at least I read the message!

Hi Simon, In the absence of any other responses, I will answer your question. Yes, you need a relay to switch the antenna from Rx to Tx. At 2.3GHz it has to be a real coaxial relay designed for the jo

I suggest that the loops are mainly for decoration rather than function. A solid disc would work as a wideband antenna.

Here is one of the type you refer to: appears to have 6 attenuator sections, 5 pi and one T (for some reason!) 27 dB total attenuation, 10W, and works well up to 6GHz. The left end is marked "input".

That says AM14/45, so it is surely BBC designed equipment. Not UHF so probably 88-108 MHz

#amplifier

Colin You don't need a high power unit for the input at the ~1mW level! I think I can provide a small 3.7GHz 3dBcoupler (not connectorised) if required and/or an SMA phase adjuster. Ken

PP selling a lot of stuff from BBC Cardiff, Lots of tables and chairs etc. but in there is: Lot 2371 3x Xicom TWTA travelling wave tube amplifiers (spares or repair) No picture, no type No.! I think t

I would try a piece of bar, say 8mm thick with clearance hole, use the tap to line it up then clamp it and you have solved the "keeping it straight" part, probably better than by eye. I have some "Tre

But ..but.. you are my hero, I thought you knew everything there was to know about all such matters!

I have a 15W PA 3.7-4.2 GHz which had a (very neat) welded lid. I eventually decided it had to come off which proved to be quicker and easier that I expected on the mill. In fact it had a conventional

I noted that for some years Radiall connectors are available with "BBR" plating, a form of bronze. According to their publicity (of course) it is better than anything else considering cost, corrosion,

I have a few 4.1-9.5 connectors, (and a 6dB attenuator) if anybody has a use for them. They were in the 1970's Plisch TV amplifiers, a few of which made it into amateur service.

HP141 SA: If anybody takes this to use, all you need to do is replace the neon with an appropriate zener diode. I did years ago and it has never taken out the fuse since.