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WDRC-FM on 101.7?

MarcB

MarcB

As I was sitting at a red light while exiting Shoprite Plaza on Queen Street in Southington I was manually tuning my radio from 102.1 down to 101.3 and was very surprised to hear WDRC-FM coming in very weakly and mixing with another station on 101.7FM. I didn't see how far I could hear WDRC-FM on 101.7, but it was still coming in very weak in the parking lot of the plaza where Bob's Furniture is. I know for a fact it was WDRC-FM as I heard the announcer say "102.9 DRC-FM." Plus I buttoned pushed to 102.9 and heard the same exact music.
 
KML-224 said:
Multipath coming off of West Peak in Meriden perhaps? :)
Click to expand...

Multipath won't create a new frequency.
It would seem to be intermod with WMRQ. It would be possible for this intermod to occur within the receiver. This 101.7 image would be expected to also have WMRQ audio.
 
Ive gone through I-684 listening to my Insignia HD portable radio and on 101.7, Ive heard multipath as I neared West Peak. Down here in New Jersey, we have local 94.7 WFME and 91.1 WFMU and on 98.3, you can hear multipath in spots within 6 miles of their towers. Whats interesting is the multipath can be so strong, it ID's the station!
 
It's intermodulation in your receiver. When the signals are very strong, the amplifier is driven into nonlinearity, in which the harmonics of the strong signals mix with the fundamentals. It's kind of like how your speakers sound distorted when you turn up the volume all the way. 2*102.9-104.1=101.7. Since 102.9's 2nd harmonic will be twice the modulation of the original, on 101.7 you will hear WDRC 3 dB louder than WMRQ on 101.7, but both stations' audio should be present. There might also be IBOC on 101.5 and 102.1 if you're really close to West Peak, but since intermodulation decreases exponentially with decreasing signal strength, it's rare to hear IBOC with intermodulation, and there never has been a case of HD reception on an intermodulation frequency. It is definitely possible to have RDS on the intermodulation product, especially if one station has RDS and the other doesn't. If both have RDS, the display will be a jumbled mess of the characters each individual station is transmitting.

94.9 is a mess near West Peak since there are 2 intermodulation products on that frequency. 2*93.7-92.5=2*95.7-96.5=94.9
 
KML-224 said:
How would WTIC-FM 96.5 figure into that equation? They don't transmit from West Peak. ???
Click to expand...
The 96.5 signal is still strong and it would mix with 95.7 near West Peak. There's also 104.1-102.9+93.7=94.9, making for 3 inter modulation products on 94.9. I've personally heard WTIC in the mix on 94.9.

I'm such a geek that I would do the math for intermodulation whenever I hear it. it's nice not hearing inter modulation on the newer DSP radios, but my 20 year old car radio gets a lot of inter modulation.
 
I'm still getting that mess on 94.9 FM here in New Britain's south end, close to Walnut Hill Park and the hospital.
 
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