How to change the frequency on one of these transmitter boxes.

[Maximus]

Did you get struck by lightning lol

Ooops...

Jel burned out 1.jpg

Jel burned out 2.jpg

Did you get struck by lightning lol

i am not 100% sure what happened as it was only given to me in a rig to take a look about 10 years ago or so but wasn't mine.

I've had crazy shit like that happen before. You can sit there and rattle your mind and never figure out what went wrong mate

[teckniqs]

and never figure out what went wrong mate

I might just message the person I got it from and see if I can find out, not spoken to him in a good few years so a perfect excuse to randomly get back in touch.
.
....I'll try and see what caused it and let you know if I do.

[EFR]

As I said, it is 95% sure it is flashover, that makes carbon path between two traces.

RF powers skineffect keeps it burning ans getting bigger, as we all know carbo cobducts electricity.

[teckniqs]

I spoke to him and he confirmed the rig was most likely from a site which had someone nasty go up there and cause late night problems
...so my guess is either coax cut or some kind of short (no one ever really "pins ya coax" haha)
But surprisingly to say it never popped the SD1407 it still worked and just caused all that other burnt out mess instead, it probably melted some connection away along the way as it started melting and it stopped it shorting (bit like a fuse but on the LPF stages and broke the circuit) so the SD probably just quickly went from shorting out to high SWR like with no aerial, but I'm just guessing.

[Albert H]

A certain "gentleman" from a well-known 80s station used to regularly insert drawing pins into the coax of rival station's. That was until he came up against my first MRF150-powered rig that didn't fail when he attacked the coax - and received a really nasty, painful RF burn for his trouble! He stopped his games after that incident, especially when he discovered (the hard way) that he had contracted Shigella as well!

[EFR]

Pins and cables likes each other, back in the day when I was doing my mandatory army service here in north east corner of EU, my friend and I did drive around training grounds just to look something to do or mess around.

So we did find one Coms team practising cable laying, just that old good twinlead around forest.

One told that their practice mission was to build 18km connection on the training grounds and then remove it after it works, quickly as possible.

So, we just did drive away, park that truck about 1km away and forest we went. After some searching, we did found not one fieldtelephone line, but two!

We used all sharp and tiny objects what we did find from that truck, and hammered them in with axe head. We did insert these like 500m-1km apart.

That was a very funny night to sit at campfire and listen local MIL coms with my Bearcat BC3000XLT.
One of cableteams didnt test after every roll of cable that they laid...

For coax tricks, If you know that rig has some real power (+500W), get an hoseclamp top of coax and turn it tight as possible. It wont work that fast as pin, but melting RG213 does look funny