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Diplexer for amp power injection?

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Old 01-11-2013, 02:06 AM   #1
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Default Diplexer for amp power injection?

although this TV fool does not show it I am in deep fringe,

http://www.tvfool.com/?option=com_wr...c84f2624447007

what makes it deep fringe is 40 miles of thick basically rain forest between me and the towers.

I have a channel master 4228 on a 15' mast, one antenna feeds one 50 foot line, passing through two ground blocks and then directly into my single TV no splitters.

I only get one station 9 NBC during the day and some nights I also get 5 the PBS station. once in a blue moon I get 28 CBS, I would like to get these two more reliably and hopefully pick up others, I think overcoming this cable loss would at least buy me PBS all day.


I have a salvaged SVI SV-A15PRS 15 DB "subscriber amplifier" i want to place directly at the antenna, it has a noise factor of 3.5db and is rated for outdoor use, I would like to try it out as an OTA amp, I have the AC power adapter for it but not the injector to send power does the COAX.

What I do have is a perfect vision PVDP3 diplexer, this diplexer is used in sat TV witch also carries DC current for power,

it has three ports

A: in/out
B: SAT
C: U/V ANT

there is a "DC pass" marking between the in/out and SAT ports.

what i think I can do is:

Antenna and amp to the A: in/out,
The power brick to the B: SAT
TV to the C: UV ANT

am I correct in thinking the 12v DC power will flow from the sat port out through the DC pass out to the amp and antenna and then signal will return through the "UV ant" port to my TV,

will this work? my TV be protected from the DC power if it is on the non DC pass portion of the diplexer?


is 50' of cheap RG6, 8 f connectors and a diplexor enough loss for 15db of amplification? i understand that I don't want to over amplify


while I am at it I actually have two 4228s, can I combine these two one over the other to increase reception? how exactly would they be wired together? coax or twin-lead?

Last edited by RavenTai; 01-14-2013 at 10:28 PM.
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Old 01-11-2013, 05:21 AM   #2
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Quote:
will this work? my TV be protected from the DC power if it is on the non DC pass portion of the diplexer?
Yes, it should.

Quote:
is 50' of cheap RG6, 8 f connectors and a diplexor enough loss for 15db of amplification?
15 dB amplification is more than enough.

Quote:
can I combine these two one over the other to increase reception? how exactly would they be wired together? coax or twin-lead?
Poke around at Ken Nist's www.hdtvprimer.com and find his "16-bay" article.
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Old 01-11-2013, 12:57 PM   #3
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3.5 is a lot of noise for the little amount of gain you will receive...

I would purchase a new amplifier with the amount of amplification you need to get the signal from the antenna to the television.
The 4228 will only receive UHF signals - and I did not decypher your web address for your situation.
Come back with a street address if you want help.
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Old 01-11-2013, 03:00 PM   #4
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There are no funds for a new amp, if this one shows improvement it may be replaced at a later date when funds allow. I am trying to do the best with what I have on hand.

The 4228 has sufficient upper VHF reception for my site, channel 9 (NBC) is my only VHF channel and it is my strongest channel coming out of this antenna currently without an amp, channel 9 is about 80% reliable, everything else that I want to get that i am not getting now is in the UHF band. channel 16 28 31 36 and 51


i would post a direct link to tv fool but this site will not allow me to post links.
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Old 01-11-2013, 04:44 PM   #5
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I would attack the situation for another perspective.

There is plenty of signal in the air above the trees.

How high would you have to go to get up there and get a breath of fresh RF radiation?

Not sure about your house construction, but a 50ft telescoping mast on top of the roof of the house would get you up there about 65ft. and might greatly improve your reception.
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Old 01-14-2013, 10:26 PM   #6
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Getting above the tree tops would certainly be the ticket, but the tree tops here are 75' to 100' Getting above them takes something like a Rohn tower far exceeding my budget.

I was hoping my home brew15' mast would help by at least getting above the roof lines of all the houses between me and the towers but it really has not helped at all,


I think all my usable signal is dropping in from local openings in the near by canopy instead of traveling horizontally over long distance as a typical TV signal is received. 40 miles of rain forest between me and the tower soaks up all the signal.

In fact the best location I have had here so far was just a foot off the ground facing a large mowed area, reception would slowly drop over a few weeks until i mowed again, I think there was some ground reflection helping me out.
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Old 01-17-2013, 05:53 PM   #7
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Got the amp in the mast and working, the diplexer worked just fine,

with the gain from the free scrounged amp:

9 went from most to always
5 went from sometimes at night to most of the time
28 went from 1 hour a month to most of the time
and I got a new station 20 abc working about 50%

I tried my mast at several locations thinking with the amp that I could get further away and possibly find a sweet spot, but it appears all area are low signal, some spots getting one station better but at the expense of others no one sweet spot of great reception, with this amp at least it appears that cable length is still an issue, shorter cable=better reception.

I moved my mast to right outside the TV wall reception is as good there as anywhere else with this mast, going to set a ground rod there so I can shorten the cable further and see what I get.
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