Re: Topband: AM broadcast multiplexing

On 4/22/2023 10:02 AM, Rob Atkinson wrote: I am always amazed at the hams who will buy a home within sight of a broadcast tower. Or this church, on a lot that borders a 50KW rig on 1160 kHz. I used this photo in a talk about RFI in church sound systems. At the time, many microphones and the m

Re: Topband: AM broadcast multiplexing

I am always amazed at the hams who will buy a home within sight of a broadcast tower. Rule no. 1 when looking for a new QTH is to find where all the AM and FM plants are and avoid them; especially QRO AMs vis a vis 160 and HF. I remember looking around the 670 site in Glendale Heights IL around 1

Re: Topband: AM broadcast multiplexing

Some years ago I had a severe AM BC imd problem -first thing I found was I needed a conductor tying the top and bottom of my T2X rotor together.(Hint was - I noted one night as I cycled the brake the imod would change or go away) But it still existed ,not as bad, but there -I found the ne

Re: Topband: AM broadcast multiplexing

59:50 PM Subject: Re: Topband: AM broadcast multiplexing Eric, I mentioned in my post that I have a filter inline. I have tried a number of different configurations, different receivers, filters and attenuators. I can see the signals on my spectrum analyzer with the BCB filter and a healthy amount

Re: Topband: AM broadcast multiplexing

Eric, I mentioned in my post that I have a filter inline. I have tried a number of different configurations, different receivers, filters and attenuators. I can see the signals on my spectrum analyzer with the BCB filter and a healthy amount of attenuation also. The spurs exist at my antenna(s

Re: Topband: AM broadcast multiplexing

Just attenuate the signals. A few resistors is way cheaper than 195 bucks. Or a 2k pot. ;-) 73 Mike W0BTU On Fri, Apr 21, 2023, 11:56 AM Eric Scace K3NA wrote: > Being so close to the transmitter site. it's quite possible that you are > experiencing receiver front end overload, and your receiv

Re: Topband: AM broadcast multiplexing

Being so close to the transmitter site. it's quite possible that you are experiencing receiver front end overload, and your receiver is generating some of these signals. You might wish to try the AM “brickwall” filter

Re: Topband: AM broadcast multiplexing

Eric, I live about 3/4 mile from the multiplexed stations KKMS/WWTC (980 & 1280) here in MN and they are all over the ham bands in my receivers. https://www.radioworld.com/tech-and-gear/tech-tips/wwtc-moves-in-with-kkms Luckily it isn't such a problem on 160m, just the 2nd harmonic of 980 at 19

Topband: AM broadcast multiplexing

I found the 4-station site: Tri-County in Sauk Rapids MN: 7 towers, 4 stations, all with different day/night patterns. A report is here with photos. _ Searchable Archives: http://www.contesting.com/_topb