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The Official AVS Antenna and Related Hardware Topic! - Page 273

post #8161 of 16113
Quote:
Originally Posted by holl_ands View Post

Which stripline coupler are you using and how much did it cost?
The Lindsay couplers seem to have disappeared in the last corporate reorg...

MAXHD has a source that will custom make them for a reasonable price. I saw a pic of one and it looks very similar to the Lindsays.
post #8162 of 16113
Combiner pic:
LL
post #8163 of 16113
Quote:
Originally Posted by Falcon_77 View Post

How about the new CM offering?

http://www.channelmasterintl.com/2016.html

This looks very basic. I have to wonder how effective sweeping the VHF elements forward is in this case.

I continue to question the value of putting out new designs for UHF 69. Sacrificing performance under 37 doesn't seem like a good idea in the long run.

Does that pick up FM radio as well?

Thanks
post #8164 of 16113
The FM radio band is between TV channels 6 and 7, so while the CM is not designed for FM, it doesn't take much antenna to pick up strong signals. For weak and distant FM, you would do better with a dedicated FM antenna, or a VHF/FM antenna.
post #8165 of 16113
Quote:
Originally Posted by cpcat View Post

MAXHD has a source that will custom make them for a reasonable price. I saw a pic of one and it looks very similar to the Lindsays.

Thanks for posting the pic I sent you.Ole Dave says he can make a dual or quad combiner in any frequency range you want.If I get this new tower in the air the next couple of days,I'll try it out and see how it works.

http://www.hamtv.com/oal.html

Gregb@etczone.com
post #8166 of 16113
Quote:
Originally Posted by holl_ands View Post

A VHF/UHF Splitter/Combiner will have less than 0.5 dB loss,
while all-band Splitter/Combiners, as well as standard (cable)
RF Splitter/Combiners have about 3.5-4.0+ dB loss.

You need the low-loss VHF/UHF Combiner that has twin screws for both VHF and UHF:
http://www.summitsource.com/antenna-...06-p-5303.html
http://www.amazon.com/Philips-PH6100...1573821&sr=8-1
This one has coax output, which is preferred for downlead.

You'll need a 75-ohm to 300-ohm transformer balun to adapt to twin-lead output.

They used to make devices with twin-lead output, but I haven't found any.

Hello, these type of UVSJ also; http://www.summitsource.com/uhfvhf-b...1fdbd68e4a3d67
and, http://www.solidsignal.com/prod_disp...PROD=HLSJ#MORE
Baluns are no problem, Menards has them for $1.98 ea.
post #8167 of 16113
Can some one tell me how to contact midwest dxer (max hd) i want to purchase the psp 1922 antenna.After reading many posts i am going with this set up.
uhf 91xg,vhf psp1922,winegard 269 preamp,and pico usjv combiner.
I live in laporte,in. 53 mi. ota to chicago sears tower.Hope to pick up after 2/11/09 all or most chicago dtv channels. am i on the right track with my selections?
Thanks-1edmon
post #8168 of 16113
Quote:
Originally Posted by 1edmon View Post

Can some one tell me how to contact midwest dxer (max hd) i want to purchase the psp 1922 antenna.After reading many posts i am going with this set up.
uhf 91xg,vhf psp1922,winegard 269 preamp,and pico usjv combiner.
I live in laporte,in. 53 mi. ota to chicago sears tower.Hope to pick up after 2/11/09 all or most chicago dtv channels. am i on the right track with my selections?
Thanks-1edmon

Scroll up a few posts and drop him a PM.

Consider pre-filtering the psp1922 by using the hi port of a hlsj in addition to using the uvsj to combine the uhf/vhf sections. That way, low band and FM are more completely filtered before amplification.
http://www.picomacom.com/specs/pico/C/C24.pdf

For some reason, I thought I remembered Chicago had a low band digital?
post #8169 of 16113
Thanks cpcat,post 2/11 wbbm will be vhf 7,so i'll be o.k. I kown this sounds stupid but i don't know what pm means.Do you know if max hd has a website?
post #8170 of 16113
I tried the email link but the email was unsucessful.
post #8171 of 16113
Sorry cpcat the light blub just lit up ,i sen max hd a pm(private message)
thanks again
post #8172 of 16113
Quote:
Originally Posted by 1edmon View Post

Thanks cpcat,post 2/11 wbbm will be vhf 7,so i'll be o.k. I kown this sounds stupid but i don't know what pm means.Do you know if max hd has a website?

Actually, WBBM-DT 3 is moving to channel 12 and WLS-DT 52 is moving to its analog channel 7.

Steve
post #8173 of 16113
You are correct steve,that's why i'm hoping to get the psp 1922 for vhf 7-12.I have a PM for max hd and am waiting to here from him.I have a question for you ,as per tv fool the recommened height for wbbm is 45' all other dtv channels are from 20 to 30 ', i plan to go 30' do you think i would be out of luck for wbbm (2.1)?I'm going to use the winegard hdp 269 preamp.My set up will be 91xg uhf,psp1922 vhf,pico uvsj combiner.
Thanks-Ed
post #8174 of 16113
I think you'll pro'ly be fine but you just never really know 'til you try.
post #8175 of 16113
"More than half of over-the-air (OTA) TV viewers nationwide
live in areas where reception of DTV signals will be
challenging, according to new research from Centris."

http://broadcastengineering.com/hdtv...0411/?cid=top5

http://www.centris.com/pages/ViewNew...ID=34&SiteID=9
post #8176 of 16113
The Centris study was debunked back in February, which it first came out:
http://www.avsforum.com/avs-vb/showt...php?p=13133695

Results are bogus, since Centris used antennaweb.org to predict reception, which
many posters on this thread have found seriously UNDERPREDICTS reception.

andy.s.lee conducted a much more believable study:
http://www.tvfool.com/index.php?opti...ask=view&id=50
post #8177 of 16113
We talked about the Centris study a bunch when it came out. There are systematic issues with it's sampling methodology that make its predictions questionable. You can't use it for any positive purpose here.
Frank
post #8178 of 16113
I have an old antenna on my roof which has 2 pairs of 300 ohm attachments. Which I believe is VHF and UHF. My TV of course take only a single 75 ohm source. How should I combine the 300 ohms signals?
post #8179 of 16113
See post #7322.
post #8180 of 16113
Thanks. Is it suitable for out door use? What is inside the box?

My twin-lead wires are kind of old and I am concerned about interference. I want to replace them with a coax. Does it make sense for me to combine the twin-leads together and connect them into this?

http://www.summitsource.com/outdoor-...09-p-4847.html
post #8181 of 16113
Sure you could scrap the twin lead.
Get 2 baluns run the coax inside use a combiner or combine outside and run one coax to the set.
post #8182 of 16113
Quote:
Originally Posted by pixelation View Post

I have an old antenna on my roof which has 2 pairs of 300 ohm attachments. Which I believe is VHF and UHF. My TV of course take only a single 75 ohm source. How should I combine the 300 ohms signals?

Use a pair of 300-ohm to 75-ohm Balun Transformers...one for VHF and one for UHF.
A pair of coax runs connect to UVSJ low-loss VHF/UHF Combiner and then coax downlead:
http://www.solidsignal.com/prod_display.asp?PROD=UVSJ
http://www.summitsource.com/uhfvhf-b...sj-p-6976.html

Be sure to use waterproof sealer on all connections.

Alternatively, if you don't have any "nearby" towers, use a Preamp with separate
UHF and VHF inputs instead. Choice of preamp depends on distance to towers...

====================================
PS: Solution for jcs444 (post #7322) was for ATTIC use, presuming coax or twin-lead output.
post #8183 of 16113
I don't want to sound like a jerk. Can it be made simpler?

What I am trying to minimize is the number of connections and cables. If I go with the above plan, I would need 2 Balun Transformers, 3 segments of coax cables and a water proof VHF/UHF combiner.

The transformer and (twin-lead) combiner cost just $0.69 and $0.49 respectively. Whats inside them?
post #8184 of 16113
Quote:
Originally Posted by holl_ands View Post

The Centris study was debunked back in February, which it first came out:
http://www.avsforum.com/avs-vb/showt...php?p=13133695

Results are bogus, since Centris used antennaweb.org to predict reception, which
many posters on this thread have found seriously UNDERPREDICTS reception.

andy.s.lee conducted a much more believable study:
http://www.tvfool.com/index.php?opti...ask=view&id=50

And even the TVFool data seems to be too conservative in my particular case. I recently aimed a 91XG with no amplification and about 125' of RG-6 into a tower farm in Austin, 60 miles away. The TVFool info reports the digital signals from these six stations as ranging from -102 to -111 dBm at an antenna elevation of 13' AGL. Five of these six stations come in with a very strong, clear signal -- better than the compressed signal I get from D* -- and the last station (the one at -111) occasionally stutters and pixelates a little but is also usually a better picture than the D* feed.

Based on the TVFool info, I was being told not to get my hopes up much, but what I'm getting blows my mind.
post #8185 of 16113
Quote:


The TVFool info reports the digital signals from these six stations as ranging from -102 to -111 dBm at an antenna elevation of 13' AGL. Five of these six stations come in with a very strong, clear signal -- better than the compressed signal I get from D* -- and the last station (the one at -111) occasionally stutters and pixelates a little but is also usually a better picture than the D* feed.

Yep, just about the same thing for me. I also have stations in an antenna farm 60.8 miles away, ranging from -81.1dBm to -115dBm. All better than -106.0dBm come in strong and consistant. The lone -115dBm station only rarely locks on. (It will be -100.2dBm after 2/19/09 so no problem). This is with my non-amp DBGH with 300ohm downlead and balun on the end.
post #8186 of 16113
Quote:
Originally Posted by pixelation View Post

I don't want to sound like a jerk. Can it be made simpler?

What I am trying to minimize is the number of connections and cables. If I go with the above plan, I would need 2 Balun Transformers, 3 segments of coax cables and a water proof VHF/UHF combiner.

The transformer and (twin-lead) combiner cost just $0.69 and $0.49 respectively. Whats inside them?

A VHF/UHF Combiner would have inductors and capacitors inside,
which can degrade/change frequency if they get moist.

I haven't seen any claims re whether Philips PH-61006 (aka CV72) is intended
for outdoor use. Perhaps you can check the bubble pack when you find one.

FYI: Radio Shack makes a similar unit:
http://www.radioshack.com/sm-300-ohm...i-2062060.html
Since they don't mark it for outdoor use, it's probably indoor only.

What I described above using OUTDOOR components will survive the elements
through multiple seasons....a cheap indoor alternative could rapidly degrade...
The UVSJ actually has low insertion loss SPECS....the first sign of a quality product.
post #8187 of 16113
Quote:
Originally Posted by Blackduck View Post

After a week or so, how do you feel about your new system in comparison to your old VU-190? Walter

Unfortunately, I haven't had a chance to study normal reception since I wrote my original posting because I left on a trip a couple days afterward. I'm on the road right now, so further reports will have to wait until after I return home.

I can add that the night before I left, a storm front moved through which greatly enhanced propagation from the northeast for several hours. All the Charlotte-area stations came in unusually strongly, and I was able to watch four stations from the Greensboro NC area (about 150 miles) whose digital signals I had never seen before: WGHP, WXLV, WCWG, and one whose call letters I've forgotten. I managed to record snippets of them, so eventually I'll create a DX section on my Web page (referenced below) and put screenshots there.
post #8188 of 16113
I would appreciate some advice and input on how best to install these two antennas.Top antenna is a xg91uhf (8' boom), uderneath a funke psp1922 vhf
(13' boom)I realy can't afford a tower so I need some advice on how best to do it.I am attaching some pictures of my house(i hope) The peak to ground is approx.20'.The chimney is approx.the same.So it's ether side of house or chimney.Thanks -Ed
LL
LL
LL
post #8189 of 16113
South Bend should be ENE from Laporte. I'm assuming the satellite dish is on the South side, but it's not clear if the other two pictures show the East side of the house.

With these antennas, you probably will want to DX? So perhaps the side of the house doesn't matter anyway.
post #8190 of 16113
Ed,

I would check around and see if you can locate some used tower. In today's age, I have found it pretty easy to find it.

As for a new tower, I would call around and get some prices. Not many people are purchasing towers with unemployment at record levels (OH, MI), that installers are willing to shave a couple of bucks of their rate. However, the materials are expensive (tower).

Let us know what you think...

Quote:
Originally Posted by 1edmon View Post

I would appreciate some advice and input on how best to install these two antennas.Top antenna is a xg91uhf (8' boom), uderneath a funke psp1922 vhf
(13' boom)I realy can't afford a tower so I need some advice on how best to do it.I am attaching some pictures of my house(i hope) The peak to ground is approx.20'.The chimney is approx.the same.So it's ether side of house or chimney.Thanks -Ed
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