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Trouble getting PBS near Berryville, VA

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Old 12-05-2018, 04:35 PM   #16  
OTA only way to go...
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Join Date: Sep 2006
Location: Berryville, VA
Posts: 21
Default Success with the Channel Master 1160A

I had some time today to play with the Channel Master 1160A and I was very impressed. I used it just as I got it with the included PreAMP, the Power Supply and some new COAX.

Very first scan I got 53 channels which included WHUT 32.1 and MPT 67.1 both PBS stations, which made me happy.

I only had the antenna about 9 feet in the air and I really did not point it precisely.

I now think this antenna is going on the roof with the rotor to replace the separate UHF and VHF antennas.

Some PIX
Attached Images
File Type: jpg CM-1160A-Table.jpg (146.1 KB, 32 views)
File Type: jpg CM-1160A-PreAMP.jpg (81.6 KB, 36 views)
File Type: jpg 53-Channels-Scan.jpg (59.9 KB, 26 views)
File Type: jpg MPT-067.jpg (61.9 KB, 23 views)
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Old 12-08-2018, 06:54 PM   #17  
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Join Date: Sep 2006
Location: Berryville, VA
Posts: 21
Default Finally getting PBS

It was a nice day today - just a bit cold - so I put the Channel Master 1160A and the Rotor up on the roof. Completely removed the XG91, the VHF antenna and the original CM-7778.

This was most definitely an upgrade from the old setup. For example, I now get all four VHF channels being broadcast from DC and Baltimore with 7 - 9 - 11 all have signal strengths in the 70's and 13 has a signal strengthen the 50's. This is to be expected considering the size of the antenna which is almost 16 feet long.

Most of the UHF channels also have higher strength than before with two exceptions. WTTG 5-1 went from signal strength of 67 on the XG91 to 58 on the 1160A.

BTW, all signal strengths came from the Signal Strength Meter on a TIVO 4.

However the best thing about this new setup is that I now get PBS on channels 67-1 thru 67-4 (WMPB) broadcast out of Annapolis, MD. Signal Strength is about 56. Still cannot get even a hint of WETA - but most likely will when they increase power sometime next year.

I did install the Rotor but it is not completely wired yet - I will do that another day.

Very Happy that I was fortunate enough to find this antenna in such good condition and that every thing works including the PreAMP and Power Suppy and Rotor. I'm not sure but when this setup was originally installed it was most likely around the mid to late 70's or early 80's.

Thanks for everyone's help on this project!
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Old 12-11-2018, 04:23 PM   #18  
OTA only way to go...
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Join Date: Sep 2006
Location: Berryville, VA
Posts: 21
Default Anyone else using a CM-116x as primary antenna?

I was just curious if anyone else here is still using a Channel Master-116x-A as their primary antenna?

What I find interesting is that several forums folks said the included PreAMP has a high noise figure. However, I don't know how I would measure the noise figure of the PreAMP without some special electronics to do so. It also makes me wonder if the original CM-7778 which I had up with the separate antennas might be better for amplification?

How might I measure the Noise figure for the older PreAMP that I'm using right now? And does it compare with the original CM-7778?

I thought the below article about the Channel Master 1160A is very interesting, especially reference to how it was developed.

http://www.rfcafe.com/references/pop...ember-1972.htm
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Old 12-13-2018, 02:12 PM   #19  
OTA only way to go...
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Join Date: Sep 2006
Location: Berryville, VA
Posts: 21
Default Got the answer - sort of

I talked to my brother about the Noise Figure on the PreAMP. He is an EE.

He gave some good advice:

1. First he asked are you getting the channels you want? - YES
2. Adding the CM-7778 will require at least one BALUN where the current setup does not require a BALUN. As I understand - a BALUN would cause some loss just by inserting it into the mix.
3. Because of the age of the Antenna - the PreAMP could be easily broken if removed.
4. If it ain't broke - - don't fix it.

Therefore, I decided not to mess with it - - with the exception of finishing the Rotor wiring so I can turn the antenna if need be.

Last edited by chapelrun; 12-13-2018 at 03:17 PM..
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Old 12-13-2018, 05:23 PM   #20  
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Default

2. Your current amp has a balun, it's visible in the photo you supplied. You just haven't recognized it for what it is.

#1, 3, & 4 are spot on. If it's doing what you want, go watch TV and leave the antenna alone.

Come back in the spring when the leaves come back out. This is the "easy" season for reception.
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