The Blowtorch that is a struggle to get?

[cyberdad]

How close are you to WBBM's stick? I wonder if you could get an image/spur of WBBM's I-BLOCK on 690 and 650 and other frequencies from being too close to them? I can't think of what else would cause hash to be present on 650 and 690 other than maybe WLW

23 miles to my southeast. In an area with good ground conductivity. WGN and WSCR are also near where WBBM's stick is. All three of them are less than 25 miles from me. I used to get a harmonic from WBBM on 920....which destroyed semi-local WOKY. But that seems to have now disappeared.

 

[boombox]

I would like to catch sometimes is the Chicago 50kw AM's

But it's hard in where I am

You could try listening underneath some of the regional signals on the Chicago frequencies. It's the only way we Washingtonians can catch WSCR and WYLL. But it's been done.

 

[Schroedingers Cat]

How close are you to WBBM's stick? I wonder if you could get an image/spur of WBBM's I-BLOCK on 690 and 650 and other frequencies from being too close to them? I can't think of what else would cause hash to be present on 650 and 690 other than maybe WLW

23 miles to my southeast. In an area with good ground conductivity. WGN and WSCR are also near where WBBM's stick is. All three of them are less than 25 miles from me. I used to get a harmonic from WBBM on 920....which destroyed semi-local WOKY. But that seems to have now disappeared.

I wonder what would cause you to hear WBBM on 920. Can't think of any RITOIE type products that would cause that either. 23 miles seems like a long way to be getting blanketing interference. Did it come in on a good "old school" analog tuned radio?

 

[Cincinnati Kid]

I never could figure out why WCTT could be heard so often with all the 50 kW stations on the frequency. I can attribute KVIS/KGLC 910 being heard coast to coast with 1 kW to the pattern and gain, but I don't think WCTT has that kind of a major lobe. I think the other AM in Corbin, WYGO 1330 was one of the first stations to ever run AT40. Anyone else have that recollection? As I recall, back in the day WCTT was Country and WYGO Top 40.

I well remember WCTT when passing through Corbin, Ky. in August, 1963 and how they interupted a Reds' game broadcast for a fire (the station was on the Reds radio network). I've only heard them since when in the vicinity and not long range.

 

[cyberdad]

I wonder what would cause you to hear WBBM on 920. Can't think of any RITOIE type products that would cause that either. 23 miles seems like a long way to be getting blanketing interference. Did it come in on a good "old school" analog tuned radio?

It came in on several radios...including both digital and analog car radios. And it went on for years. It's probably been 5-7 years since I've heard it. I also get our local 850 (WAIT) on 1700, but that one is easily explainable.

 

[Icangelp]

I never could figure out why WCTT could be heard so often with all the 50 kW stations on the frequency. I can attribute KVIS/KGLC 910 being heard coast to coast with 1 kW to the pattern and gain, but I don't think WCTT has that kind of a major lobe. I think the other AM in Corbin, WYGO 1330 was one of the first stations to ever run AT40. Anyone else have that recollection? As I recall, back in the day WCTT was Country and WYGO Top 40.

I well remember WCTT when passing through Corbin, Ky. in August, 1963 and how they interupted a Reds' game broadcast for a fire (the station was on the Reds radio network). I've only heard them since when in the vicinity and not long range.

Here on the west side of your namesake city, I hear WCTT regularly. though I'm not big on their format and don't stay long.

 

[radioman148]

I wonder what would cause you to hear WBBM on 920. Can't think of any RITOIE type products that would cause that either. 23 miles seems like a long way to be getting blanketing interference. Did it come in on a good "old school" analog tuned radio?

It came in on several radios...including both digital and analog car radios. And it went on for years. It's probably been 5-7 years since I've heard it. I also get our local 850 (WAIT) on 1700, but that one is easily explainable.

I used to have a similar issue with WBBM & WGN coming in on 840 on most of my radios. Their towers are very close to each other, but they are about 18 miles from me. Neither station was strong, but they were there during the day. WHAS took them out at night.

 

[rfry]

I used to have a similar issue with WBBM & WGN coming in on 840 on most of my radios.

Probably the result of the 2nd harmonic of 780 mixing with the fundamental of 720 that was/is present in the output stage of the 780 transmitter (r-f radiated by 720 would be coupled into the 780 transmitter by the 780 antenna system, due to 720's proximity in frequency and transmit location).

2 x 780 - 720 = 840

The match of 780's antenna to the spur on 840 wouldn't be optimum, but probably the 780 antenna would radiate 840 to some extent, if it was present in the output spectrum of their transmitter. The 840 spur would contain the program modulation of both stations, to some extent.

If that 840 signal is gone now, maybe 780 added or improved a network to keep 720 out of the 780 transmitter, or to reject the 840 spur before they could radiate it.

Below is a list of these products possible from the combinations of 670, 720 and 780:

f1 f2 2f1-f2

670
720 620 (WTMJ would cover that)
780 560 (WIND would cover that)

720
670 770
780 660

780
670 890 (WLS would cover that)
720 840


R. Fry

 

[BobOnTheJob]

WHAS 840 takes a beating from WCCO's I-BLOCK starting just 30 miles north of Louisville. By the time you get 80 miles north of Louisville, it's once proud signal is unlistenable at night. I hope WCCO is getting some benefit out of using IBOC at night because they are sure making a mess out of AM reception in too many states to count.

 

[LKidd]

Back in the old days, WCCO was a bit of a problem to receive clearly at times in central Kansas because of a "squeeze play" between two other 1-A clear. (WHAS and WBAP)

 

[radioman148]

I used to have a similar issue with WBBM & WGN coming in on 840 on most of my radios.

Probably the result of the 2nd harmonic of 780 mixing with the fundamental of 720 that was/is present in the output stage of the 780 transmitter (r-f radiated by 720 would be coupled into the 780 transmitter by the 780 antenna system, due to 720's proximity in frequency and transmit location).

2 x 780 - 720 = 840

The match of 780's antenna to the spur on 840 wouldn't be optimum, but probably the 780 antenna would radiate 840 to some extent, if it was present in the output spectrum of their transmitter. The 840 spur would contain the program modulation of both stations, to some extent.

If that 840 signal is gone now, maybe 780 added or improved a network to keep 720 out of the 780 transmitter, or to reject the 840 spur before they could radiate it.

Below is a list of these products possible from the combinations of 670, 720 and 780:

f1 f2 2f1-f2

670
720 620 (WTMJ would cover that)
780 560 (WIND would cover that)

720
670 770
780 660

780
670 890 (WLS would cover that)
720 840


R. Fry

Thanks!

 

[BigDave]

I can't ever seem to get 830 WCCO from Minneapolis in Woodstock. WHAS on 840 covers it up

 

[1L6E6VHF]

CFZM 740 toronto (about 230 miles). Sometimes quite strong, but generally weak and with fading.

Maybe it sounds weaker than it is because I so want to LISTEN to it, not just DX it.

Seems to be best in the early evening. Perhaps KFQD 750 has I-BLOC and wipes out CFZM when the sun sets there?

WHO and WBZ engaged in mutually assured destruction when both were I-BLOC. Equally strong, both were strong and clear in the past. I think WHO has turned off I-BLOC, leaving WBZ audible (albeit with their own interference) and WHO whacked.

Like everyone else has noted, KDKA seems to be putting 49,500w into heating bad coax and 500w into the air!