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560am WIND / 910am WGTO

P

polenta3

Any ideas why I would be receiving both stations at the same time when my car radio is tuned to 910am? I just installed an antenna booster in my car.

I now get way better reception, even in HD. I did hear both the stations specifically state the call letters and freq. The signal was so clear, I thought that it was one station that was simply playing two programs at the same time in error. Listening in Crete, IL

http://www.jcwhitney.com/garage-pro-universal-antenna-booster/p3045267.jcwx?filterid=u0j1
 
polenta3 said:
Any ideas why I would be receiving both stations at the same time when my car radio is tuned to 910am? I just installed an antenna booster in my car.

I now get way better reception, even in HD. I did hear both the stations specifically state the call letters and freq. The signal was so clear, I thought that it was one station that was simply playing two programs at the same time in error. Listening in Crete, IL

http://www.jcwhitney.com/garage-pro-universal-antenna-booster/p3045267.jcwx?filterid=u0j1
Click to expand...

What you are hearing most likely are the mixing products of the combination of 560khz, 910khz, and 1470khz in CHICAGO HEIGHTS IL.
The math works out like this: (560+910=1470, 1470-910=560 etc etc)

In Dallas we have a similar situation in certain parts of the metroplex with the combination of 620khz 1190khz 570khz. In the Dallas example we are able to pick up mixing products of each of these stations on each frequency as you've described in your post. In your situation it's more than likely a case of receiver front end overload caused by the recent addition of your new RF preamplifier.

Jay Walker
 
WOW! that's interesting. Make sense though. I'd never heard of such a thing.

I was trying to revise my post, actually. After listening a bit longer I realized that it was access radio, 1470am. Not 910 GTO....so it is exactly what your saying 560/1470 on 910am.

wierd stuff. So is it really advisable to such an P-amp? Thus far, it seems to have help with picking up chicago HD stations in my area. Also, I am able to get 90.9 WDCB much clearer now.
 
polenta3 said:
WOW! that's interesting. Make sense though. I'd never heard of such a thing.

I was trying to revise my post, actually. After listening a bit longer I realized that it was access radio, 1470am. Not 910 GTO....so it is exactly what your saying 560/1470 on 910am.

wierd stuff. So is it really advisable to such an P-amp? Thus far, it seems to have help with picking up chicago HD stations in my area. Also, I am able to get 90.9 WDCB much clearer now.
Click to expand...

Well, you've discovered the disadvantage of a pre-amp. A better solution is a variable gain pre-amp to cut down on the front-end overload, but finding one for your specific application off the shelve could be problematic. Your other option while running the pre-amp is "less" antenna. It's a trade-off either way.
 
What you are hearing is an image of 1470 if it is on 560. If your preamp has a good tuned radio frequency stage, it will eliminate the image when tuned to 560. I built Tom Kneitel's one transistor AM preamp from "103 Simple Transistor Projects" and eliminated the problem many years ago from WFNT (WKMF) 1470 to WRDT (WQTE/WHND) 560 quite easily. Just the tuned radio frequency circuit with an antenna and ground inductively coupled to the ferrite rod inside the radio will do the trick. It more than likely wasn't caused by WGTO.

The 910 could be the difference. Both would have to be very strong though.
 
How close do you live to the 1470 tower site? Did you hear 1470 on any other frequencies?

WCFJ 1470 is licensed to Chi. Heights, their tower site is located in Crete however. It could be the simple fact that you live very close to the site and may be located to the northeast of the site, where the bulk of the signal is directed to protect AM 1470 in Peoria.

I'm not dismissing what the others said about the equations, they are all correct, I'm just putting out another possibility.

When I read your post, I read it as you were listening on an hd radio, was that correct?

If so, the hd should not be affecting those stations, as none of them run hd, they only broadcast in analog.

I should explain that a little more, this is not meant to talk down to you if you know this already. I have had friends who thought that they were receiving hd radio on their regular radio because the station had an hd in their name or ID.

I also had friends that thought if you bought an hd reciever that all AM stations would be in hd. That is not the case, the station has to broacast an hd signal to recieve it.

In Crete you may be able to pick up 1390 or 1690 in hd, or at least detect the signal in your display, if the signal is not strong enough to listen in HD.

I am not sure if they would be strong enough to hear the hd in Crete. You could try 670 or 780 which may decode in hd because they are powerful, but with hd your only getting about 500 watts digital, 50,000 watts is for the analog signal.

890 WLS would have probably been your best hd catch, they stopped using hd a while back.
 
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