[BC] Closest-frequency AM diplexes

[Steve]

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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