I have a Drake MN2700 so I can at least get the amp to work above 1870Khz during contests. The tuner used some fixed flat 150pf 5KV capacitors to switch in from the front selector as increased capaci
A fat fan dipole is really the way to go for simplicity if you are only interested in 3.5 to 3.8 with a VSWR less than 1.5 to 1 Herb, KV4FZ On 10/21/2013 2:58 PM, Jim Brown wrote: On 10/21/2013 11:46
A classic Delta Loop fed in the corner and tuned for 3.6 Mhz does a very good job at 3.8 if the antenna is at least suspended 10 feet away from the top of the tower in an attempt to minimize interact
If I can rephrase Richard's remark that says "Amp that can't handle that has no place in my shack." or Amp that has tubes without handles has no place in my shack. Herb, KV4FZ On 10/26/2013 4:05 PM,
Tennadyne/Cubex is still in business as I ordered some new replacement quad wire via e amail and they responded quickly. When the wire arrived it was all pre-cut and marked for each band and element
Hector, Go to the W8JI.com website where Tom has the detailed performance done on the various types of coax chokes and how the stack up with voltage and current baluns. 73 Herb Schoenbohm, KV4FZ I wi
I am looking to build a beam for the WARC bands to replace the wire antennas I currently use on 10/18/24 Mhz. I think I have sufficiency learned my lesson in recent seemingly unending pile ups that t
Magnus, I had the same problem here on my VHF antenna rotated by the GX-450 and found loose contacts at the crimp portion where the cable is terminated in at the control box plug was what caused it.
Maybe using a many layer sandwich of Lexan or of Teflon sheets between the base plate and foundation and large insulated washers might be cheaper but the capacity of that plate to ground and any volt
Oddly enough after 50 years of struggle in learning how to put on coax connectors I finally found a new Chinese coax connector on Ebay that can be obtained for 213, RG-8A and LMR-400. It comes with w
I am trying to get my RCS-12C Ameritron antenna switch interface working with a DX-Engineering 8-Port Antenna Switch in a 1-8 configuration. However the Ameritron box outputs switching voltage on mor
Joe, You are always so very helpful in solving problems....but in this case I must have read and re-read the skimpy Ameritron manual 10 or more times. The jumpers are in the right setting per the man
I looks like a design problem since the voltage on any unused port should be zero and not enough to trigger another relay on the DX-engineering switch. I have, however, come up with a fix and that is
Some time ago I posted a problem I had with the RSC12 8 position Antenna switch controller sending out phantom voltages to the switch causing the extra relays to close by accident. Measuring voltages
Depending on the top diameter of the pole a top section of a Rohn 25 can fit over the top and be securely bolted or lagged in place This makes the antenna mounting and rotor plate easier to work with
Depending on the top diameter of the pole a top section of a Rohn 25 can fit over the top and be securely bolted or lagged in place This makes the antenna mounting and rotor plate easier to work with
*but any good dipole has a null off the end, so you really need two at right angles to work both S and W. With dipoles, the only thing that really matters is the nulls off the ends.** * ** **73, Jim
This B&W Antenna sort of reminds me of the infamous MaxCom antenna feed which gave a VSWR of less that 2:1 from 1.8 to 30 Mhz sold for a while in the 70's and 80's. After scamming thousands of hams w
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I have suspended a T antenna from two 50' foot tress or poles and a 50'drop wire...adjust the T to give a good match on 1.8 against ground. (A few radials will do. Them with two additional drop wires