Shameless commercial plug follows - Topband types usually have large rx antennas, and when my beverages and rx 4-square coaxes started snapping at me when thunderstorms rolled over last year (they we
Phil, I built my own bidirectional, two-wire beverages (probably very like the DXE units) and, in my opinion polarity only matters if you are phasing two beverages. 73, geo - n4ua On Sun, Jul 31, 201
Or, if you don't want to do your own packaging, I have a large quantity of new Minicircuits ZSC-2-1-75 available (same two-transformer design, although smaller cores). <http://www.minicircuits.com/pd
Paul, The last two sets I built, I used Bud PN-1321 for the reflection transformer at the far end, and the slightly larger Bud PN-1323 for the input transformers and relays at the feed end (these wer
If anyone is interested in playing with some HF-rated PINs, I have a quantity of Microwave Associates MA-47266 available. They are 1.5 watt, axial leaded parts (about the size of a 1/4 watt resistor)
All, I guess it's time for me to put up my "common mode choke" test technique for all to shoot at. I have a HP 4815A Vector Z meter, a N2PK VNA, and a HP 8753C VNA. I have all the probe adapters for
Agreed. In all cases, I placed the unit under test on a wood workbench. In addition, after I had decided on the final balun design for each band, and packaged it in its final pvc enclosure, I attache
It may be worse than that - about half my Q's are not yet matched on LoTW (my two known good cw 160 ones are), but of the ones that are, the strangest is a 160 Q on 1851 kHz, on CW. That one is defin
All, This argument has been going on ever since I got out of Engineering school, and frankly, it's not going to stop until "my" generation is gone. I'm an EE and I work in my own machine shop in my (
It's a contest - I don't care if I miss KP4 and KP2 as long as everyone else does too! 73, geo - n4ua _______________________________________________ It is undesirable to believe a proposition when t
Anecdotal information to be sure, but back in the 60's there was a series of articles in, I think, 73 magazine, that detailed Gus, W4BPD's ham career. Part of the story described how he prepared for
I have used plastic coffee stirrers from the fast food joints; they start out smaller and they cost the same... ;-) 73, geo - n4ua _________________ Topband Reflector
Look at the Ohmite OX and OY series of resistors; they are pretty rugged under surge conditions and, as best I can measure, they are claimed to be non-inductive at HF. 73, geo - n4ua ________________
Pete, I recommend you stay with the F-connectors. BNCs are fine in a lab environment where cables must be disconnected often, but their convenience factor comes with a trade-off in reliability. If, h
Hi Charlie, This is one area where practice overrules theory. Yes, SS is not the conductor that copper is, but it's not bad, and since you're posting on the lowband forum, I presume you're interested
All, I apologize for briefly QRMing the FT5 this evening. Mistakes were made; buttons were pushed. I will try to pay attention in the future. 73, geo - n4ua _________________ Topband Reflector Archiv
The N2PK design is a well-regarded piece of kit, and I built one about 4 years ago. It compared very well with the HP 8753 VNA I had on my bench at work back before I retired. It has a very enthusias
Nothing original here, but I use a cheap 1.8432 packaged logic-level oscillator driving all the gates of a 74LS04 in parallel, followed by a switchable 20 dB pad, all packaged up in a small minibox.