My understanding was the width of the reflector plate was equivalent to the width of a normal reflector element and its height was a free-space 1/4 wavelength.

Have you considered a schrader valve, giving it a (very) gentle pump of air with a bike pump and then looking for where the bubbles are getting in? I suspect it may be a thermal cycling issue ... heat

Ah, yes, that makes sense. Should I find ten minutes to unbox mine again from its nice home up the mast, I may give that a go!

Was the stripline still the original length?

You could try removing a little capacitance from the "hot" end by trimming off the pad area "north" of the capacitor mounting hole ...

I had exactly this ... well, actually, I had two issues, first when "peaked" my crystal was LF, so I needed the optional 10pF capacitor in series with the crystal. If I had read Sam's excellent notes

I have can hear a bit of "fizz" in some directions, but overall, not bad. I have a very poor setup on 13cm though ... the transverter has a poor noise figure and I can't really turn the PA up very muc

I suspect if you look with an analyser you will discover the problem is out-of-band, but still very strong. Filtering as others have said will solve this. A good interdigitial filter will work wonders

Hi John, Just a 20dB horn at the moment, I'll pan it around your way ... I'll see if I can get a bit more two core wire and poke the mast up a bit. PM you when I've managed it. I should at some point

Right then, after a stupidly busy 10 days of work (finally finishing at 10pm last night ... ) I've actually managed to get back to the shack for a few hours this morning. Having solved the issue with

I was just reading the SCAM12 document from Clark ... and ... https://wiki.london.hackspace.org.uk/w/images/c/ca/SCAM_12_User%27s_Handbook.pdf

What I have intended (but failed so far ... ) to do to mine is fit an "inverted bucket" to the top section, so it completely covers the tops when the mast is in the down position, preventing the secti

I've always used silicon spray ... and I have trace heating tape wrapped around it, with a frost stat .. my biggest worry is it freezing with water in it and distorting the tubes ...

Glad to hear it. I tend to use an Android tablet when out portable, and find that most useful as it saves the added clutter of a laptop, tethering to a data source etc. I'll PM you regarding the other

Hi Dave, I'll contact you via PM for some more info, I have tried this stuff on desktop mac with High Sierra OS, which is quite old, so I had hoped the newer ones would work. it can be quite difficult

I think £50 is a reasonable value to put on a piece of broken electronics that probably only costs double that to manufacture in the first place. I've not insured an outbound parcel in 20 years ... UP

Hi David, not currently. You could of course open two "tabs" in your browser, one for each band. Others have mentioned the "two bands" thing, I'll consider it, I am keen to keep the display simple and

As some of you may have heard, the author of KST2ME, Bo, has said that no more license keys will be issued, once your current key expires, it is dead. If anyone has any specific features of KST2ME tha

Hi John, I've been blogging various bits of "stuff" at https://g1yfg.blogspot.com/ but nothing really complete yet. I hope to complete the final verison of the 13cm LNA at some point which may then ma

I could turn you some up in brass ... sadly I can no longer silver plate as the fish tank full of cyanide has been deemed to be one the "you're not bringing that thing in the car" items that didn't ma