[BC] Closest-frequency AM diplexes

[ACN]

Steve, I think KJR went 50kw at the original KTAC 850 site in Tacoma.

Not happy with the coverage from Tacoma, one of the owners moved KJR to 
Vashon Island.

Someone else might have better details.

Tom
ACN Network

----- Original Message ----- 
From: Steve
To: Broadcast Radio Mailing List
Sent: Monday, January 02, 2006 6:39 PM
Subject: Re: [BC] Closest-frequency AM diplexes


Hi Dan:

I worked in Seattle in the 80's. I knew the chief of KJR at the time and I
recall it was a 2-tower array and ran 5Kw and added the second tower at
night. I guess this has changed? Correct me if I'm wrong. I won't be getting
into this one as it's not my forte. I just happen to see KJR's power and
thought I would ask.

Steve
Steve Walker Productions


----- Original Message ----- 
From: "Dan Strassberg" <dan.strassberg at att.net>
To: <am at nrcdxas.org>; <broadcast at radiolists.net>
Cc: "Peter Haas" <PeterH5322 at aol.com>; "Scott Fybush" <scott at fybush.com>;
"Grady Moates" <Grady.Moates at loudandclean.com>; "Rene F. Tetro"
<rtetro at pobox.com>; <rcarpen at erols.com>; "Craig Healy"
<craig at craighealy.com>
Sent: Monday, January 02, 2006 8:14 PM
Subject: [BC] Closest-frequency AM diplexes


> Rene's comment about 870 and 1090 in Kingsport-Johnson City being real
close
> in frequency (and using Kahn Powersides to increase the fequency
separation
> by an additional ~10 kHz) brought up this great AM-techno-Geek trivia
> question: What are the closest-frequency diplexed AMs that you know of?
For
> the uninitiated, "closest" is determined not just by the frequency
> difference but by the ratio of the frequency difference to the higher of
the
> two frequencies. So a hypothetical 1460/1600 (8.75%) would beat a
> hypothetical 550/620 (11.29%). I have a feeling that the winner will be in
> the Honolulu area, where triplexes are commonplace, quadriplexes are not
> unusual, and there may even be a quintaplex. OTOH, nearly all stations in
> Hawaii are ND. Answers should include not just the calls, frequences, and
> CoLs, but also powers and number of diplexed towers.
>
> I'll start the ball rolling with Wilmington DE, WTMC 1380 519W-D/15W-N ND
> and WILM 1450 1 kW-U ND, 1 tower, 4.82% (smallest frequency separation I
am
> aware of)
>
> and San Jose CA, KSJX 1500, 10 kW-D/5 kW-N DA-2 (three towers in each
> array--two shared by D and N arrays, four towers at site) and KZSF 1370, 5
> kW-U DA-1 (uses all four towers at the site), 8.67% (smallest frequency
> separation I am aware of for moderately high-power stations and more than
> three towers)
>
> Locally in the Boston area, we have (among others) WBIX 1060 Natick (days)
> 40 kW/22 kW-CH DA-2/D two towers at site, both used in both WBIX day
> patterns, plus WKOX 1200 Framingham 10 kW-D/1 kW-N DA-N (same two towers
as
> WBIX) 11.67%, and WSRO 650 Ashland 250W-D/9W-N ND-U 38.68% (with respect
to
> 1060) Grady Moates is CE of WBIX.
>
> And WBIX (nights) 2.5 kW five towers and WAMG 890 Dedham 25 kW-D/3.4 kW-N
> (five towers D and N, five towers at site) 16.04%. Note that Craig Healy
is
> CE of WAMG.
>
> Seattle has KGNW 820 50 kW-D/5 kW-N DA-2 (three towers; three towers at
> site) and KJR 950 50 kW-U DA-2 (uses all KGNW towers day and night)
> 13.68%.(smallest frequency separation I am aware of for two 50 kW
stations,
>
> although KJR was previously 50 kW DA-1 five towers and was diplexed with
> KHHO 850 Tacoma, 10 kW-D/1 kW-N DA-2 (two towers D/three towers N/four
> towers total; two towers shared with KJR by day, three by night--IIRC).
This
> was a separation of 10.53%.
>
> If anyone can relate any war stories involved in getting close-frequency
AM
> diplexes to work, that would just add to the fun.
>
> --
> Dan Strassberg, dan.strassberg at att.net
> eFax 707-215-6367
>
>
>
>
>
>
>
>
>
> _______________________________________________
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