I wasn't aware that W2DU had developed the "center-tapped" approach, as opposed to the basic idea of the bead-type current balun. As explained on the lab notebook page, I tested with and without the
Inteesting. Are your assumptions changed by the presence of the amplifier at the base of the whip, which is designed to match to 75-ohm cable? I will give the beadless version a try. 73, Pete N4ZR __
In response to all the curiosity and commentary about the ON4UN choke arrangement, I have added some material quoted from his Low-Band Dxing, 4th edition, at the end of the writeup <http://wiki.conte
My shunt-fed tower requires an Omega match in order to get a good feedpoint SWR. My current Omega match has 3000-volt air variables in both positions. I understand the calculation for the voltage acr
That smells like a shorted connector and a long feedline to me. 73, Pete N4ZR New Articles Daily - the Contesting Compendium at http://wiki.contesting.com The World Contest Station Database, updated
Indeed ... I have a 500w watt local station on 1550 KHz about 5 miles from me, and my MFJ-259 was completely useless on 160. I hauled my TS-930 out to the base of the antenna and had the match adjust
A great article by K3NA and W2VJN has just been republished on the Contesting Compendium. See <http://wiki.contesting.com/index.php/VP6DX_receiving_antennas>. At first blush, you might wonder "what's
The DX Engineering unit designed by W8JI has been reported by many to work better than either MFJ. But don't all such units depend on there being single sources of noise? If you have multiple sources
I remember reading, somewhere on the net, a US Army contractor paper on the subject of using trees as radiators, by using such a solenoid to couple RF to the trunk. IIRC this was for special ops in t
I picked up a FAR Circuits kit for a complete K9AY loop system at Dayton, and am building it now. I have a separate ARR wideband preamp here, which I have used with K9AY loops in the past with some s
On the other hand, auroral activity is also trending up strongly, currently at 8. 73, Pete N4ZR Visit the Contesting Compendium at http://wiki.contesting.com The World Contest Station Database, updat
Readers should be aware of some complications -- the amqrp.org link is well out of date - like about 4 years. For a time, www.softrockradio.org was the place to go for information on the softrock ser
I'm setting up to do some analysis of the reasons for what seems like an excessive number of Skimmer mis-identifications of calling stations as CQers, particularly on the low bands. Alex has asked me
Further to my mea culpa yesterday - I had an e-mail from Tony, KB9YIG, saying that the reason that his web site isn't more enlightening is that things are moving too fast. He says he's averaging 160
Thanks to everyone for responding so quickly to my call - I have the sample I need now. -- 73, Pete N4ZR Visit the Contesting Compendium at http://wiki.contesting.com The World Contest Station Databa
Harking back to the message that started all this, I'm not sure there hasn't been a misunderstanding. Let's say hypothetically that it was TX3D that wouldn't make a dupe QSO - in the case of DXpediti
A couple of comments. The SDR-IQ has some available options so far as front-end and IF attenuators, which may be useful on Topband. It's frustrating how little information is published about the rece
I'm amazed that there hasn't yet been any discussion of N6LF's article. His tests appear to demolish a lot of fondly-held beliefs (certainly including my own), and to point the way to a better topban
Bandplans aside, the ITU Radio Regulations indicate that there are some pretty severe regulatory restrictions in Region 1 on the use of 160M by amateurs. I wonder how real the need for these is, part
I feed my 160m receiving antenna with about 300 feet of RG-6, which supplies power to an amplifier at the antenna. Recently, I started seeing an high-resistance short across the coax (~30-50 ohms). I