Exactly! All true and Tom is right on point! You have removed a lot of series reactance with that "gamma cage", Carl -as indicated by the required tuning C changing.from 160 pF ot over 400 pF. OF COU
I'm impressed, too! I believe Carl has it whipped!! Should be a really good transmit antenna for Topband!!b Changing to that multi-wire "gamma cage" really eliminated a lot of series reactance and lo
Good morning, JC Well, in its present configuration, Carl's antenna is not really a folded monopole, although it did start our as one when he had his gamma match connected at full height of 90'. At p
Good morning, Mac Please let me know if you see further repeats of any of my posts to the reflector. No one else had told me about that, so I appreciate your letting me know. After your e-mail, I did
Thanks, Harold! Well, I would have thought I'd see repeats here also. I think that what might have thrown Mac, was that there I have had a lengthy exchange, over several days, with Carl Braun, AG6X (
Thanks, Carl Well, I received this e-mail from you 2X - because you addressed it to me and also to "topband". I often do the same if I want to communicate something to you, that I think might be wort
Yikes! Let me see how I addressed those last couple e-mails, Carl! Then I may need to do some more malware, spyware, and ati-virus scans! Thanks for the info! I'll continue to look into it. Sounds li
No, I don't believe 240' is too high - especially if the tower has a base insulator! It would be so close to 1/2 wave on 160, that it could be fed very well as a 1/2 wave radiator on 160, either via
Good point! --Original Message-- From: Topband [mailto:topband-bounces@contesting.com] On Behalf Of Ashton Lee Sent: Tuesday, February 25, 2014 4:03 PM To: DALE LONG Cc: topband@contesting.com Subjec
Well, he's talking about going in November - maybe in time for CQWW CW -but probably not. 73, ... Joe, W4TV _________________ Topband Reflector Archives - http://www.contesting.com/_topband _________
That's not so surprising Gary !! te Way the Beverages and similar slow-wave antennas work is that they depend on the lossy GND underneath for their operation, so a salt marsh would not be a very bene
Perhaps so - but Dale is gong down there to put in a 240' broadcast tower. 73, Charlie, K4OTV I agree with Herb. Also Haiti is on an earthquake fault. The quarter wave tower would have a better chanc
True!! Check out the prices of the Cal kits for the Agilent VNAs! 73, Charlie, K4OTV I'm a VERY happy owner of the 3E model VNWA. I've made measurements on my 160M antennas with no difficulty, but I'
Those should surely be accurate enough, but what kind of connectors? Charlie, K4OT V Can HP microwave loads be used? I have a set good to 24 GHz and another to 50 GHz. Carl KM1H _________________ Top
Well, SMA is probably the most generally useful. With the adaptors in place, we just have to make sure that we include the adaptors in our calibrations. When it gets to be really "witchy" is when we
What the hell is the need for wideband data in the amateur radio bands? Is it just a ploy to usurp the amateur bands for commercial purposes? And there's a heck of a lot more band width available at
No, Price! Way above Topband in frequency, but the principles of Vector Network Analysis and calibrating out the cables to move the measurement plane to the end of the cable are the same at 1.8 MHz a
Well, of course we don't, Mike. That was just a comment about the challenges of calibrating tiny transmission lines for use with a VNA. No microscopes needed for RG-8 or even RG-58! :-) 73, Charie, K
Well, I might be willing to use a VNA that attaches to a computer in my Lab, if I could get away with much lower cost than one of the Agilent or Rhode and Schwarz VNAs. I'd like to have the capabilit
Thanks, Jim! That's good information, I'll look into it! Thanks! Most of my VNA work in recent years was in the design, tuning and matching of embedded antennas for 900 MHz, 1.4 GHz and 2.5 GHz for e