I think you're being overly picky. The 75-ohm cable would be at worst a 1.5:1 mismatch. Probably a fraction of a dB loss at most, particularly with foam type hard line. If you have a source of good,
The SWR on the line is still 1.5:1. SWR= Zr/Zo or Zo/Zr, whichever case gives a ratio greater than one. Zr is the load at the far end of the transmission line, and Zo is the characteristic impedan
That's a phrase I coined in response to the situation Tom described; maybe another term would be used in the textbooks. A quarter wavelength 75 ohm coax working into a 50 ohm load, transforms the
during bidding on a 500' spool of 7/8'' Navy surplus material. I'd like to use it with a pair of large blocks and a couple of eucalyptus trees. What oils or chemicals would be appropriate for the jo
I just finished replacing the top set of guys on my 127' 160m vertical. Big Grips were used with the strain insulators, replacing the cable clamps used on the old guys. Some of the information I glea
In that case, the perpetrators should be happy to cooperate in eliminating the interference, once they become aware that their operation is attracting attention over a wide area. Most potheads with
My 160m vertical tee has an extensive buried radial system that's probably at least 2× overkill. The ATU is located in a small wooden 'dog house' about 7 feet away from the base of the series-fed tow
Kind of a pulsating buzzing sound, centred around 1915, but audible down to slightly below 1900 and up to approximately 1925. At its centre frequency last night (Saturday), it was just as strong as a
More information on the nature of the signal can be found here: http://www.topbandhams.com/tech-page/30-washing-machine-daylight-recording-k3pgp I did not hear it at all last night (Tuesday). It was
That's correct. But the FCC has proposed to discontinue the radiolocation allocation in that frequency range, and return the entire band to amateurs as primary users, in an omnibus NPRM released two
LORAN was a system of radionavigation, not radiolocation. Not the same thing. Radionavigation is just what it says, a system used to help navigate a moving ship, plane or land vehicle. It was a usef
It was very strong, centred on 1915 kHz, around 0430 GMT, Monday 09 February 2014 (Sunday evening in N America). Don k4kyv _________________ Topband Reflector Archives - http://www.contesting.com/_to
My 160m antenna is unique in that I have never run into anyone else with anything exactly like it. It consists of 127' of Rohn 25, insulated at the base, with 120 buried radials each 133'6" long. Pro
NEVER use regular lead/tin solder if there is any possibility that it will come in direct contact with the soil. Minerals in the soil will quickly turn the solder to white powder. I once used leaded
What does it say about the state of amateur radio to-day, that the term "DQRM" has entered our jargon? _________________ Topband Reflector Archives - http://www.contesting.com/_topband
Yes, it has been with us a long time. Largely (but not entirely) a legacy of the 75m AM v. SSB wars of the early 1960s. But in numerous discussions of the K1N issue was the first time I have ever he
The FCC has raised the secondary Amateur Service allocation at 1900 to 2000 kHz to primary. Up until now, we were "secondary" users in that segment, with the Radiolocation service having priority. As
Money talks. Just like the lack of enforcement of Part 15 rules against spectrum pollution from power lines, plasma TVs, switching-type wall warts, etc. And now it is being proposed to severely cut
Money talks. Just like the lack of enforcement of Part 15 rules against spectrum pollution from power lines, plasma TVs, switching-type wall warts, etc. And now it is being proposed to severely cut
Re Docket 15-99 While most attention so far has focussed on the proposed new MF and LF allocations, there is also the issue of fish net beacons on 160m. The initial comment deadline is past due, but