What kind or rotator controller ? Is it doing some kind of PWM (pulse width modulation) when it starts and stops the rotator, that is inducing EM fields in the MFJ voice keyer ? How close is the rota
Sure...the rivets can be drilled out and you can fix it...But why ? After the digital TV switchover on February 17, 2009, there will be very few TV stations occupying the Low VHF (Channels 2-6) part
If you're just looking for a 2x2 switch, and don't need remote operation, the B&W 594 is a lot simpler and cheaper. They seem to turn up at hamfests for < $10. For 2x6 switching, and other variation
Without passing judgment on the usefulness of HFTA, let me tell you my story... I live on a hilltop, with a net dropoff of 400 feet in the first quarter mile, in every direction except west. The drop
An interesting discussion. I strongly recommend reading the article "Feeding Stacked Dissimilar Yagis", by N4GG, in the March/April 2009 issue of the National Contest Journal. 73, Steve, N2IC _______
I have had the lightweight version of the 40M4LLDD for a little over a year. It's been rock solid, mechanically. We get lots of wind here, but no ice. K1TTT has had numerous ice issues with his 40M4L
Sounds like you're making an assumption that the inter-station interference has something to do with the TopTen 6-way box. What makes you believe that ? Have you tried bypassing the 6-way box and con
I am moving a TIC 1022E from a Rohn 45 tower to a Rohn 25 tower. I'm having trouble fitting the frame to Rohn 25. Am I missing some kind of bracket needed for Rohn 25 ? If anyone has a close-up pictu
Really ? I have a KT-34XA, a KT-36XA and a KT-34A. All elements are insulated from the boom. You can get surprising interactions. For example, I have a 2 element wire beam on 80 meters, supported fr
I recently acquired some NOS (new-old-stock) Phillystran. Based on its weight and diameter, it's HPTG 11200. How can I tell whether it is old Philly, that requires potting, or new Philly, that uses B
100 MPH is 40 lb/ft2 . That would make his 300#/100 MPH load 7.5 ft2 . 73, Steve, N2IC _______________________________________________ _______________________________________________ TowerTalk maili
I am planning on taking two lengths of 75 ohm coax, running them parallel to each other, and connecting the shields together, to create a 150 ohm parallel line from the two center conductors. Is ther
It may be another thread, but some reality needs to go into your decision. Just because a nearby antenna is non-resonant does not mean that it will not interact with other antennas. Every ARRL Antenn
I have replaced the magnetic reed switch in the OR 2800. It is important to get the right spacing between the reed switch and the motor. I forget exactly what it should be, but the M2 technical suppo
As a first-order approximation, Jim is correct. However, the low-band VHF channels have not been totally abandoned. There are even new applications for use of these channels. W9WI's web site has a we
The companion spreadsheet used to be on the ARRL web site, before the conversion to the new ARRL web site. Since it is copyright protected by W6NL and ARRL, I hesitate to post it myself. Maybe someon
If your transmitter site has a PC, you could always use a wattmeter that has a PC display, such as the ArraySolutions PowerMaster II, and remote desktop software to display the desktop anywhere. 73,
I have had a 40M4LLDD up for over 5 1/2 years. No problems, mechanically. I live in a windy location (20 MPH every day, and up to 75 MPH every year), but no ice. One interesting issue is the SWR beha
Jonathan, Before you conclude that your D240 doesn't have much pattern, run some more tests on DX signals. From your QTH in Colorado, I would recommend listening around your sunrise for signals from
You could put the insulated guys up the 'stinger' about 15 feet above the tower top. That should work. Often, this does not work. Let's say that the stinger is guyed half-way up (22'). The wind blows