Re: [IRCA] WKDN 950 Philadelphia harmonics

[Russ Edmunds <wb2bjh@xxxxxxxxx>]

With a barefoot Sony 2010 here I have no harmonics of WKDN. It sounds like your receiver may be prone to overload 

and that the combination of the antenna and is such that you get the harmonics. Unless you have some reason to 

listen on one of those frequencies, I don't see that this means that you have any problems you need to fix.

 
Russ Edmunds
15 mi NNW of Philadelphia 
Grid FN20id
<wb2bjh@xxxxxxxxx>





________________________________
 From: Russ Edmunds <wb2bjh@xxxxxxxxx>
To: Mailing list for the International Radio Club of America <irca@xxxxxxxxxxxxxxxx> 
Sent: Saturday, September 7, 2013 7:42 PM
Subject: Re: [IRCA] WKDN 950 Philadelphia harmonics
 

I am not as close - I'm closer to their night site which they share with WWDB-860, but I'll try to check tomorrow.

But to answer your first question, yes it is very possible. It could be coming via the power lines, but just as easily not.

If you are in their main pattern, then you are likely seeing upwards of twice that in terms of effective power. And all of
that is indeed likely to be legal. I'm not familiar with your receiver, but your receiving system probably has too much 
gain to handle that kind of power.

Do you hear the harmonics on any other radios not using the Wellbrook ? That could answer the question as to where
the issue is.

I am about the same distance from KYW, and while I don't pay attention to whether or not anything has harmonics, because 
I don't care about those frequencies, I do get other spurious signals from them. For instance, I get a mix of 1060 and 560 on 
1620. I get a mix of 1060 and 610 on 1670. I also heard KYW on 1560 io=n the car when I'm near the transmitter. All of these 
are pure signal overload. If I aim whatever antenna I am using to null KYW, most of these disappear. 

 
Russ Edmunds
15 mi NNW of Philadelphia 
Grid FN20id
<wb2bjh@xxxxxxxxx>

AM:  Modified Sony ICF 2010's barefoot
FM: Yamaha T-80 & T-85, each w/ Conrad RDS Decoder; 
Onkyo T-450RDS; Tecsun PL-310 ( 2);
modified Sony ICF2010 w/APS9B @ 15'; 
Grundig G8 w/whip; modified Sony ICF2010 w/whip



________________________________
From: Aaron Kreider <aaron@xxxxxxxxxxxxxxxxxx>
To: irca@xxxxxxxxxxxxxxxx 
Sent: Saturday, September 7, 2013 6:29 PM
Subject: [IRCA] WKDN 950 Philadelphia harmonics


Should I be able to hear harmonics of local Philadelphia WKDN 950 during the day?

I live 3.5 miles from the station.  I'm in the path of their directional beam.  They use 43 kw.

I wrote the station engineer and he said they were following the law.   I can hear them on the 2, 3, 4, and 5 harmonics using my Wellbrook 1530S+ (active version - less amplification) and QS1R. They also mix in with 900 khz and a local RFI noise (probably a switching power supply).

Their strongest signal (950 khz) is only -13 dbm (loop pointed at the station).  On 1900 khz they are -75 dbm.  On 2850 khz they are -71 dbm.  I cannot null the harmonics.

My antenna is 10 feet from power lines (unfortunately there are power lines all over my property), so they are possibly being radiated by that.

Can anyone else near Philadelphia hear them?

Aaron
Philadelphia, PA



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