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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[TowerTalk\]\s+AM\s+Broadcast\s+Harmonic\s+Interference\s+to\s+75\s+Meters\s*$/: 8 ]

Total 8 documents matching your query.

1. [TowerTalk] AM Broadcast Harmonic Interference to 75 Meters (score: 1)
Author: Byron Tatum <bjtatum1@att.net>
Date: Sat, 5 Dec 2020 16:14:53 +0000 (UTC)
Hello-   Can someone point me in the correct direction, in finding technical help and someone to make measurements, regarding a problem I have at my new QTH involving harmonic interference from a loc
/archives//html/Towertalk/2020-12/msg00009.html (8,079 bytes)

2. Re: [TowerTalk] AM Broadcast Harmonic Interference to 75 Meters (score: 1)
Author: <k1ttt.dave@gmail.com>
Date: Sat, 5 Dec 2020 12:15:44 -0500
You might want to query the rfi reflector... also consider something close to you, even a neighbor's house, that might be picking up the primary, rectifying it, and modulating it with a 10khz switche
/archives//html/Towertalk/2020-12/msg00010.html (9,696 bytes)

3. Re: [TowerTalk] AM Broadcast Harmonic Interference to 75 Meters (score: 1)
Author: "Jeff DePolo" <jd0@broadsci.com>
Date: Sat, 5 Dec 2020 13:34:22 -0500
Byron - You didn't say what the callsign of the station is, but it appears to be KAVY(AM). They are licensed for 2500 watts day, 178 watts night, both non-directional. That's about 11.5 dB differenc
/archives//html/Towertalk/2020-12/msg00011.html (11,348 bytes)

4. Re: [TowerTalk] AM Broadcast Harmonic Interference to 75 Meters (score: 1)
Author: amfone via TowerTalk <towertalk@contesting.com>
Date: Sat, 5 Dec 2020 18:54:41 +0000 (UTC)
An actual harmonic of a station on 1290 would fall at 2.580 with the third harmonic being at 3.870. Can you understand what is being broadcast on the transmitter, music, voices etc for positive ident
/archives//html/Towertalk/2020-12/msg00012.html (12,628 bytes)

5. Re: [TowerTalk] AM Broadcast Harmonic Interference to 75 Meters (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Sun, 6 Dec 2020 07:15:40 -0600
Are there other AM properties in your area? When you receive, is it with any kind of preamp on an unturned antenna or something like a coax fed dipole straight to your receiver or transceiver? I had
/archives//html/Towertalk/2020-12/msg00016.html (7,823 bytes)

6. Re: [TowerTalk] AM Broadcast Harmonic Interference to 75 Meters (score: 1)
Author: Earl Morse <n8ss2014@gmail.com>
Date: Tue, 8 Dec 2020 15:36:44 -0500
I think the previous posts have covered most of the possibilities. I would hazard to guess that the crud you are hearing is the main culprit and the 3rd harmonic of the AM station is getting the bad
/archives//html/Towertalk/2020-12/msg00029.html (11,459 bytes)

7. Re: [TowerTalk] AM Broadcast Harmonic Interference to 75 Meters (score: 1)
Author: "Gary Schafer" <garyschafer@largeriver.net>
Date: Tue, 8 Dec 2020 14:49:23 -0600
I had a similar problem with a Kenwood TS430. It has lots of relays in the front end to change filters etc. Sometimes just hitting the transmit button momentarily would make the products go away, oth
/archives//html/Towertalk/2020-12/msg00030.html (13,522 bytes)

8. Re: [TowerTalk] AM Broadcast Harmonic Interference to 75 Meters (score: 1)
Author: john@kk9a.com
Date: Tue, 08 Dec 2020 15:20:09 -0600
I concur. I had the same 80m broadband broadcast mix when I lived near Chicago. John KK9A I think the previous posts have covered most of the possibilities. I would hazard to guess that the crud you
/archives//html/Towertalk/2020-12/msg00031.html (9,505 bytes)


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