The QRPer Board

and since you'll be here in EU, check this

https://reflector.sota.org.uk/t/2b2c-li ... tory/32984

I've been playing around with some EFHW antennas in the backyard. 1/2 W radiator and counterpoise straight to BNC binding post on the KX3. I'll probably wind myself a 9:1xformer. Also bringing 25' of RG316. A note, for an EFHW you'll need at least a 49:1, the 9:1 ratio is ok for an EFRW, the idea i...

If memory serves me correctly, the battery is a "carry on", but it should be removed from the rig and kept inside a sealed bag As for the remainder of your questions, I suggest you to carry a "random" wire antenna with a 9:1 and a counterpoise, plus a run of (say) 33 ft or so coa...

Here's a "crazy" idea, use a tape measure as your antenna :D You connect your feedline (ok the transformer) to the end of the tape, extend the tape to the desired length lock the measure to that and hang up the spool :D then you may also run some tests "at home" to find out the l...

Here's an idea, maybe a crazy one, but I think it may be worth discussing, let's say we have a telescoping support (or a fishing rod) we want to use to support our vertical antenna, now, we need something to support it, and this "something" should be portable and easy to deploy in differen...

Brian, maybe I was unclear, for portable QRP use, lacking a counterpoise and using the coax as a counterpoise is acceptable and by the way, in such a case, willing to use a choke (e.g. to prevent issues due to RF aka CMC), the latter should be placed near the transceiver end of the coax and not near...

Thanks Andrew, Well explained. If I may, just one more question...at what approximate power level does the choke make a significant difference? In my limited experience, it seems like QRP power levels (~5W) just don't need a choke? Does the choke help at QRP power levels? 73...Mike Mike, you're loo...

What is the ultimate purpose of a counterpoise in a EFRW setup? Forgot this one, for an antenna to radiate, a current must flow on it, for a current to flow, an equal and opposite current must flow "elsewhere", now this "elsewhere" is some path with the lowest impedance to the R...

I'll try the choke, but since the QCX mini is a single bander, I just want a simple resonant antenna (so I won't need to carry a tuner with me). Whoops, I overlooked the rig, forgive me ! Well, yes, an EFHW will fit, but contrary to what some people says, give it a bit of counterpoise, 6.5ft or les...

regarding chokes, as I wrote, my reference design is the one from Rick (DJ0IP) https://www.dj0ip.de/rf-cmc-chokes/different-kinds-of-chokes/d2-guanella-choke/ but that's for QRO and uses a quite heavy toroid (FT240...) which adds some weight to a portable kit, for QRP a 140 should suffice, going fo...