Hi guys, I'm back
I've got a couple more Qs.
Here's some pics from my attic. Can anybody ID or give opinion?
(Note: My first time posting pics and making my webpage, plus I changed a handful of burned out light bulbs while I had the ladder out! You guys are slave drivers
Here's the UHF, looks like it's not a CM 4221 remember that it's from 1990.http://hometown.aol.com/newsgroupjohn/images/uhf.jpghttp://hometown.aol.com/newsgroupjohn/images/combo.jpg
VHF is good except chn 9 CBET from Windsor, Ontario eh?
It's in different direction and farther than others, but no hockey now http://hometown.aol.com/newsgroupjohn/images/vhf.jpghttp://hometown.aol.com/newsgroupjoh...s/vhfvjobs.jpg
These are combined in attic (no or minimal loses???)
I gave the UHF a twist based on compass. I went a long time w/o dropouts/freezes but lately some on chn 4 (45), WDIV @210deg. Didn't troubleshoot a lot, because I was watching another channel that was rock steady. Now, I have a plan to check analog UHF if possible when it acts up.
Have read in Detroit thread that when I had DOs, cable AND satellite also did. This had led me to wonder if problems may not be OTA reception
Also have noticed UHF analog appears to me to be more ghosty than snowy, even if ghosts are weak, stable and generally look "OK" although I've heard "static" in sound even when picture is quite good (analog). Does this imply MP or weakness, or does it depend?
If I knew I could use a 4228 to solve problems I think I'd try it. Might have to do some disassembly to get it thru opening and it would be a pain to add a rotor, I'm not sure what the consensus is w/ or w/o rotor. This would be under the assumption I could cut down MP, and still have strength, but maybe I'd be fooling myself.
I got a new Pio plasma and hooked it up to the attic antenna (condo) I had installed when it was built about 15 yrs ago. I don't know what it is and haven't been up there yet to look.
I get from the high 70s to low 90s on sig strength screen, which is not easy to monitor when watching. I've seen some dropouts or freezes for up to a few seconds which I think *may* be associated with rain or possibly wind or fog(!)? When conditions are right for this, the signal goes down to 40 or 50 briefly. (Is it likely that this is multipath?)
This is what antennaweb shows:
* red - uhf WWJ-DT 62.1 CBS DETROIT MI 200° 14.1 44
* red - uhf WTVS-DT 43.1 PBS DETROIT MI 200° 14.1 43
* red - uhf WXYZ-DT 7.1 ABC DETROIT MI 218° 14.1 41
* red - uhf WKBD-DT 50.1 UPN DETROIT MI 230° 15.3 14
* red - uhf WDWB-DT 20.1 WB DETROIT MI 200° 14.1 21
* red - uhf WJBK-DT 2.1 FOX DETROIT MI 210° 13.9 58
* red - uhf WDIV-DT 4.1 NBC DETROIT MI 210° 12.3 45
* red - uhf WADL-DT 39.1 IND MOUNT CLEMENS MI 126° 12.9 39
From what I've read here, I get the impression that:
1. Multipath may be my problem vs. signal "strength".
2. An amp may cause a problem instead of solve it.
I haven't seen much about how directional antennas are and I wonder if I don't have a highly directional one, would one be likely to solve my problem since these stations that I'm interested in are within 30 deg?
(Any recommendations, assuming I can fit it in.)
Is there any easy way to verify the coax and connectors are good? (With ohm meter etc?)
Would it be foolish to try a preamp halfway between the antenna and TV, where I have a coupling for the coax already?
1. Probably. But diagnosing reception problems with digital meters is never easy. If you have UHF analog stations broadcasting from the same towers at the same relative power (take digital and multiply by 5 for analog equivalent) then watching them can tell you what the problem is. Does the picture get very snowy? Or do you get moving ghosts? The answer to that question will tell you the answer to your problem. Snow = weak signals. Ghosts = multipath.
2. 30 degrees is not a directional antenna. A directional antenna should have an acceptance angle of less than 10 degrees. Examples include the Channel Master 4228 and the Antennas Direct 91XG. Either of these would probably require a rotor.
3. If you're getting signals that are routinely in the 70s+, your coax is most probably good. If you consistently had problems above or below a certain frequency, things would be different.
4. Foolish? If you've got snow on the analog test in answer #1 above, no. If you've got any ghosting now or when you have issues, yes.
You need to get up there and take a picture of the antenna and post it here. At your distance, a CM 4221 should work and has a beamwidth of around 60 degrees. If you're already using something equivalent though, you'll have to go bigger. Sometimes attics can really block the signals. If you can't get the pic at least desribe what it looks like.