A friend of mine in our local radio club sent me the following email "I'm 6/10's of a mile from an AM 910 KHz. transmitter. They operate with 5k daytime and 2k at night. They're S9+45db on 160 meters
Mark, I had the same problem - I live a mile from 760 AM at 50KW 24/7. I used a homebrew highpass filter and that helped but didn't quite reduce it enough. What I figured out was the signal was also
Normally - you would only put BCB filters in the receive line - so you don't need something that handles lots of power. I don't understand why anyone would be looking at transmit filters for this pro
Here is what I used when I had the same problem 50kw line of sight 4 miles 1MHz. Expensive, but worked very well. http://herostechnology.co.uk/pages/RF_Filters.html Having the filter between rig and
Hi, Some radios do not have a separate receive antenna connector. The 'friend' wants an out of the box solution. Without a sparate RX antenna connector it would be required to handle the transmitter
Had a similar problem at Field Day a few years ago with WJR (50,000 watt station). Noticed the problem was not present when antenna tuner was inline. Many modern rigs have broadband front ends which
Author: Julius G via Topband <topband@contesting.com>
Date: Mon, 29 Jul 2019 14:19:07 -0400
When I was in Guam I used a Dunestar 400hpf with good results Gus K4SXT _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
For signals reaching your equipment via coax shield: I found something that works very well to eliminate this is a pair of back to back baluns as close to the rcvr as possible. --Mike, WV2ZOW _______
If the S-Meter is close to accurate, the signal on 160 meters is better than -30 dBm. One cannot dismiss that the noise floor of the transmitter on 160 meters is stronger than atmospheric noise and c
I bought a DLW Associates FL1718 filter and have been completely happy with that choice. I got mine direct from Doug Williams because I wanted a custom filter with one of the notches centered right o
Thanks for all the replies. My friend is probably going to go with a DLW custom filter. I'm embarrassed that I forget about the common mode choke as I use them here on all bands especially 160M. I to
Yes, at 1 MHz, this would work well. Other hams would be advised that it is ineffective for QTH's with stations high in the BCB. The data sheet goes to a lot of trouble to obfuscate this. At my QTH,
Author: Larry via Topband <topband@contesting.com>
Date: Wed, 31 Jul 2019 02:34:07 +0000 (UTC)
There is a 50KW AM broadcast station line of sight to my top band antennas. Caused huge problems at greyline because they are dawn to dusk transmitting.I built the HPF in the ON4UN handbook. As desig