[opendtv] Re: 20050810 Wolfsson's Wednesday Words (Mark's Monday Memo)
- From: Mark Schubin <tvmark@xxxxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Fri, 12 Aug 2005 19:56:03 -0400
I haven't mentioned it, but in some of the tests we did use a variable
attenuator, and in Thursday's tests we put in and removed splitters,
which also had an attenuating effect (in larger jumps). In the recent
tests, we never had problems with stations with adjacent NTSC
transmissions (of which there are several), but we DID have a problem
with WABC-DT, which is adjacent to WNYW-DT.
Here's a short list of NY-market DTTs with adjacent-channel assignments
(not all are necessarily on the air):
Channel
18 - WMBC-DT (adjacent to Class A WEBR-CA on channel 17)
22 - WLIW-DT (adjacent to analong WLIW on channel 21 and WFTY-DT and
low-power WVVH-LP on channel 23)
24 - WNYE-DT (adjacent to analog WNYE-TV on channel 25 and WFTY-DT and
low-power WVVH-DT on channel 23)
27 - WTBY-DT (adjacent to WNBC-DT on channel 28)
28 - WNBC-DT (adjacent to WTBY-DT on channel 27 and WFME-DT on channel 29)
29 - WFME-DT (adjacent to WNBC-DT on channel 28 and WPXN-DT on channel 30)
30 - WPXN-DT (adjacent to WFME-DT on channel 29 and analog WPXN on
channel 31)
38 - WWOR-DT (co-channel with low-power WPXU-LP and adjacent to
low-power WNYN-LP on channel 39)
40 - WXTV-DT (adjacent to analog WXTV on channel 41 and low-power
WNYN-LP on channel 39)
44 - WNYW-DT (co-channel with W44AW and adjacent to WABC-DT on channel 45)
45 - WABC-DT (adjacent to WNYW-DT on channel 44)
48 - WRNN-DT (adjacent to analog WNJU on channel 47)
51 - WNJN-DT (adjacent to analog WNJN on channel 50)
53 - WFUT-DT (co-channel with low-power WKOB-LP and adjacent to analog
WTBY on channel 54)
56 - WCBS-DT (adjacent to WLNY-DT on channel 57 and analog WLNY on
channel 55)
57 - WLNY-DT (adjacent to WCBS-DT on channel 56 and analog WNJB on
channel 58)
61 - WNET-DT (adjacent to analog WRNN on channel 62 and W60AI on channel 60)
Not all of those pairs are co-located, but WNYW-DT on channel 44 (246
kW) and WABC-DT on channel 45 (182 kW) are both in midtown Manhattan.
TTFN,
Mark
Richard Hollandsworth wrote:
>It took awhile, but I think I've seen the results for all of the tests
>conducted in Mark Schubin's apt. Nowhere did I see any mention of trying a
>simple attenuator to reduce the signal.
>
>Since the strong signals (esp Analog stations) would be pushing both the tuner
>RF Front End and Mixer into the high intermod region, an RF Attenuator (e.g.
>R-S 15-678) would reduce the signal going into the tuner and thereby push it
>into a more favorable operating region with increased SFDR (Spurious Free
>Dynamic Range).
>
>
>
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