Hi Dennis and top band interested folks, The very first amps I made for myself were using an external power wire. Using external power required some pretty heavy choking on each end of that added wir
Hi Ed, I knew about the 2N3866 and 2N5109 disappearing so I bought a bunch of 2N3866 while they were still in stock. Same transistor die only with a lower Ft of 800MHz instead of 1500 MHz. I have use
Hmmm, Nick, I beg to differ with you. I dont care about scores or countries, zones worked but I do care about 160 meter receiving antennas. In my opinion your statement is dead wrong. Not looking for
Hello Csaba, I approach this problem this way your impedance ratio is 745/50 ohms or 14.9 . To get turns ratio use the square root of that which is 3.86 . So round that up to 4 as a good turns ratio.
Hi Mike, Assuming that you did not miss that this was a tapped winding and not separate windings as Csaba mentioned. I see on reflection that he measured 1:1.16 on one of his tests. In reality it won
Hi Don, Regardless of the transformer whether its a tapped or separate. I gave him the tools that should make whatever he does correct. Personally I keep my Beverage when I make one at 450 ohms which
Sorry Guys, I miss interpreted Csabas transformer problem. My email program truncated the URLs and most of the information past that point. What I did get I misread as a result so now I am curious al
I looked at the headers in that email and one IP address was reported as a shop in Fremont Ca. The other IP addresses in the email did not report any information except the lookup was denied due to e
Hi Low Band people, Nice presentation Steve. I would like to point out that Beverage users or even other phased antenna users should not use paralleling two 75 ohm coaxes and then matching them back
Hi All, Rick I have to agree with you up to a point. Your 9 circle and other 8 circle receiving arrays except mine are on wide footprints and only use 4 active antennas at a time. All of my antennas
No its not a valid message. Note the extra underscore in the .com/_ of the URL. DO NOT CLICK anything on that message. Lee K7TJR OR Is this a valid message? Regards, Pat - KZ5J You have received an i
Hi John, What did you use as the P3 bandwidth for your noise measurement? And conversion to 1Hz equivalent. The P3 has its own bandwidth and is not affected by setting the receiver bandwidth. Lee K7T
Drew, A simple search for "humming bird deaths due to colored fence insulators" brought hundreds of hits including university studies. All of these reference this in electric fence use however in my
Congratulations Steve, Your passion shows up in the voluminous amount of information on many aspects of Top-Band and others you have shared with the world. Well deserved! Lee Strahan K7TJR __________
Greetings All, For the Hi-Z arrays any additional common mode choking for most all installations would not be needed. You are correct at K3LR there are added common mode chokes in the element feedlin
According to Roy Lewallens Eznec site there are no more expensive versions of his Eznec software. He is retiring and is leaving a last version for free download. Take a look at Eznec.com for details.
Rick's point is well made. Take a look at these measurements from about 10 years ago. https://www.k7tjr.com/coaxial_tests.htm Lee K7TJR OR --Original Message-- From: Topband <topband-bounces+k7tjr=ms
Hello Ash, It depends on how complex an array you want to build as to whether these amps would work OK. Two or three elements might work fine. There are several things that concern me about these amp
I first met Bob in Visalia when the topband guys were meeting in a restaurant or pizza place which must have been before your time running the Topband dinner Steve. Bob was the very first guy I helpe
And don't forget to discharge the element to ground before connecting to your measuring device. Static is NOT your friend in this case. Lee K7TJR If that were all I could add, I'd switch them to 40 3