An SWR Thingy


100w 50 ohm resistors, overkill i know. HAHA. For such a simple circuit that an swr bridge is, i really do not understand its operation. Yeah i get the diode rectifies AC to DC and we twiddle the knobs till we get an output voltage that suits the meters or ADC we are using. Its the bit above that which does not make much sense to me, like how does the transformer separate out forward and reverse powers. That is beyond my level of comprehension. And it seems none of my books know either and seem to take it on faith that it works.


Transmit Receive Antenna Switching

Circuit Schematic

Front Face

Back Face.

Kind of obvious how it all works, pulling the BNC to ground changes over the amp relays from receive to transmit. 12v to the antenna relays to turn on the appropriate antenna port.

I will be controlling the antenna ports from a micro controller that is also changing over relays on the low pass filter board, which is also what I intend on building next.


Bodge Wires

When big black wires start to replace your beautiful traces, YOU FUCKED UP! HAHAHA

Other than the wiring error and the wrong footprint for the RCA jack, I think this amp tx/rx switching with 3 antenna ports should do the trick. Its been designed to handle 400w plus, but will get mated to a revision of the 100w amp I designed. I probably won’t even respin the board with fixes on it, I am only ever going to build 1 of these I do not need more amps than that HAHAHA


Digital QSL Cards

I know that there are a lot of purists out there who will rage and wet the bed about receiving QSL cards in the email, but I do not mind it. I know they count for nothing in most awards, but awards are not the be all and end all of ham radio. Just knowing that the other person took the time and effort to download some software and use it is good enough for me and more than enough confirmation I need.

The biggest problem I have is that I have confirmations on QRZ, Eqsl, LOTW and Cards and quite often someone will confirm on only one and not the others. While it would be nice to have all the confirmations in one place like LOTW, its just not the way of things and so I have changed my definition of dxcc to suit this reality. When I have 100 confirmations across all platforms that is my dxcc even if no one else will accept it. Lets face it, I am not paying the arrl $100 to get a bit of toilet paper printed in an inkjet mailed to me to hang on my wall and wank over like its the greatest thing ever. So why should I bother with using it as my count for 100 contacts confirmed.

This means I am currently sitting at 90 confirmed on 40m and I just need 10 more. I am closer to 3 band dxcc than I think. The hardest part is tracking things across 4 different platforms, luckily I do not have many cards I need to count in and QRZ tracks both its confirmations and LOTW’s so its just adding in the few others only on Eqsl.

And as for the above emailed card, this is the only station I have worked from Albania. Its as confirmed as I need and care for, though he should eventually also confirm on lotw. Now to send him a reply.



Come on, piss down you bastard. Man we needed this rain. Is been so dry and finally we are getting a real good soaking. Looks like I wont be driving into town to haul water for the vege patch today and our tanks are getting some sorely needed water in them. Will just need some followup rain in a months time and we should be good though to winter.


Teeny tiny hail.