That is a very misleading statement typical of all revisions and corrections to that book. Any loss before the first active device will degrade the MDS, noise figure, SNR, or whatever else you wish t
Deliberate QRM and other bad behavior has been on 160 ever since it was opened to all frequencies, 1500W (and a lot more by some), and 160 included on every rig and amp. There are very few who operat
Why not one rod and just switch the antenna wire between the resistor and transformer primary? The relay would be a SPDT at the antenna side. Whichever end is floating shouldnt have any effect. Place
Id expect the lower RF resistance of 2X more wire would help also. My only cage experience were a pair of 1/4 wave verticals for 80 that were also fed as half waves on 40 at a prior QTH here in the s
All coils have loss so its a decision as to which one do you want? If the coax loss is minimal and the amp loads into it thats the one Id take and then add radials until there is no further meaningfu
That might have been me as Ive been a bit vocal about it. A typical balun is wound as an autotransformer with all leads having a common DC point and wound together which provides little to no isolati
A common mode choke, made by winding many turns of the coax around a ferrite core, would help. The best core to use is Fair-Rite mix #31, and you want at least 14 turns through a 2.4-inch outer diame
See what the lastest rigs are using to switch front end bandpass filters. In the 80's my job involved using PIN's in RF modems as low as 5MHz. Considering their measured performance I modified my TS-
Im running 250' of shielded CAT5 from house to equipment trailer where the router resides and then another 120' up the tower to the 5.8GHz link. Its bundled with the hardline feedlines, rotor and rel
Im well aware of that but the only noise generator in that system was the router switching PS and I replaced that with a linear one. Over the years Ive spent days or weeks eliminating noise sources g
Ive seen a few that use copper tubing wrapped around a 55 gallon plastic drum and a 30-40' vertical element! Im running a top loaded T supported off the side of the 180' tower and elevated radials. C
The broadcasters also dont fall for the resonance bit either; very few radiators plus radials have anything to do with an actual resonance. All of this was explained back in the 30's. Carl KM1H _____
. That was the birth of EME, not a resurgance. Sam, W1FZJ, made the first EME contact just a few years before moving from MA to PR. I was one of his antenna "apes" in MA as his favorite saying was "i
W1BU was the club call for the Rhododendron Swamp VHF Society in Medfield, MA and never left there until it expired and was reissued years later. Sams son Pat, W1HIV, still lives there. Carl KM1H ___
Several are working well over 500 miles at night and 300 daytime with under 100W into similar antennas and that is with regular CW. ERP is often under 10W mainly due to a small radial field. Carl KM1
Somewhere, somebody managed to get a TS-940 to transmit down there at around the 10 milliwatt level out of the transverter port. Ive been looking for that info but no luck yet. Carl KM1H -- Original
FWIW I get well over 20dB side nulls from a 2el Cushcraft clone and about 15-20dB off the rear which varies by arrival angles. With a pair stacked the rejection is often better and beinng able to upp
I suspect it will become a battle between traditional CW and the digi modes in such a small assignment. Building a transverter to go with any xcvr would likely be easier than a scratch built CW rig.
I recently talked to Ken Gordon, W7EKB, who owns 600mrg@w7ekb.com, the 600M experimental group forum about opening it up to hams that are interested in learning more about the new 630M band before it
This may be of interest to a few as applied to either band. Fritz was the force behind getting the first experimental license and after a few years of lobbying getting the ARRL to get behind it. http