Dual Purpose Antenna - Escape Trailer Owners Community

Go Back   Escape Trailer Owners Community > Escape Tech > Escape Systems | Water, Waste, Charging & Propane
Click Here to Login
Reply
 
Thread Tools Display Modes
 
Old 05-02-2016, 10:29 AM   #1
Senior Member
 
thoer's Avatar
 
Join Date: Oct 2009
Location: Galesville, Wisconsin
Trailer: 2017 21 "Blue II" & 2017 Highlander XLE (previously 2010 17B "Blue" & 2008 Tacoma)
Posts: 3,955
Dual Purpose Antenna

After reading a bit about TV and FM/AM antennas, it seems to me that the same antenna on the roof of an Escape could serve for both a TV and a radio/stereo. I've been looking at this model :1byone Omni as it is lists all the required frequencies in its specs. It also comes with a 12V signal amp. My thinking is that the single coax would run from the antenna to its booster amp, then to a splitter. Then one regular coax to the TV and one adapter cable like this one: Adapter cable going to the automotive type radio's ETI uses. The gain of this antenna seems like it should be good, at least to my non-expert reading.

Do any of those of you with more radio/antenna expertise see potential problems I might be missing? I hate to put any extra holes in the beautiful fiberglass roof of our trailers and this seems like a way to use one hole for both systems.
__________________

__________________
Eric (and Mary who is in no way responsible for anything stupid I post)

SAE Towing Standard "Beware of false knowledge; it is more dangerous than ignorance." George Bernard Shaw
thoer is offline   Reply With Quote
Old 05-02-2016, 11:26 AM   #2
Senior Member
 
Join Date: Feb 2016
Location: Area 51, New Mexico
Trailer: pondering.....
Posts: 728
pretty similar to the Lava RVHD-2015
lavasat.com
lavasat.com/en/upload/proimg/RVHD-2015_Manual.pdf
there is a a wiring diagram there for that version and there appears to be several variations of this antenna on the web all coming from china.
have no idea how good they are....they all seem to be about 12vdc @ 50 ma which doesn't draw much battery power.
The booster amp is probably inside the antenna..the only real difference being the mounting variations, coaxial attachment, and the power injection interface.
__________________

freespirit is offline   Reply With Quote
Old 05-02-2016, 02:27 PM   #3
Senior Member
 
Join Date: Dec 2012
Location: Edmonton, Alberta
Trailer: 1979 Boler B1700
Posts: 9,036
Yes, FM radio runs in VHF Band II, which is right between the VHF Band I used for TV channels 1 through 6, and VHF Band III used for TV channels 7 through 13. That means any antenna suited for VHF TV channels is sized right for FM radio as well. There's more to antenna design than frequency, but FM radio and VHF TV are compatible.

Many antennas are sold for this combined use, so they're obviously suitable. You might find some antennas (particularly with amplifiers) which include filters to exclude the bands that are not wanted, so a dedicated TV antenna might not work properly for radio, or vice versa... but the description should say so if this is the case. The 1byone model linked is certainly suitable for both FM and TV.

I would be cautious about the claimed gain. A directional antenna has gain because it is "focused" in one direction, at the expense of all other directions, which is good. This is "omnidirectional", meaning not directional, so it doesn't have this sort of gain - it isn't pointed anywhere in particular, just at the horizon all the way around. They're listing the boost of the amplifier. Amplifying random noise doesn't create useful signal (despite what scriptwriters for TV shows apparently think), so that gain number doesn't say anything about how well the antenna works.

A proper splitter shares the signal strength between two outputs, so both radio and TV will get a weaker signal than if they were not sharing. A better approach is probably to use a separator/coupler, which essentially directs FM radio frequency signal to the radio output, and the rest to the TV output, so both are only slightly reduced from having their own antenna. An example is the Winegard CA8800 FM Band Separator/Coupler FM Tap (CA8800), but this particular product appears to have been discontinued a couple of years ago and so is likely not available: it is listed on Amazon.com, but shows as unavailable. It looks like there are alternatives, but they're hard to find...
1 Ghz TV/FM Isolator; Philmore # CS200
Brian B-P is offline   Reply With Quote
Old 05-02-2016, 04:56 PM   #4
Senior Member
 
thoer's Avatar
 
Join Date: Oct 2009
Location: Galesville, Wisconsin
Trailer: 2017 21 "Blue II" & 2017 Highlander XLE (previously 2010 17B "Blue" & 2008 Tacoma)
Posts: 3,955
Brian does an ordinary splitter halve the signal strength when only one, TV or radio, is powered on and operating; or always?

Also, with digital HD TV broadcast signals becoming more common, wouldn't a booster work better on a weak digital than an analog one? I'm not sure about Canada, but here in the US all the TV over the air signals are digital now.
__________________
Eric (and Mary who is in no way responsible for anything stupid I post)

SAE Towing Standard "Beware of false knowledge; it is more dangerous than ignorance." George Bernard Shaw
thoer is offline   Reply With Quote
Old 05-02-2016, 05:49 PM   #5
Senior Member
 
Join Date: Dec 2012
Location: Edmonton, Alberta
Trailer: 1979 Boler B1700
Posts: 9,036
Quote:
Originally Posted by thoer View Post
Brian does an ordinary splitter halve the signal strength when only one, TV or radio, is powered on and operating; or always?
Unfortunately, always. Each output is 4 dB lower than the input, which is half power... regardless of whether or not something is using the signal.

If you only want to use one at a time - and unless you are recording from one of them that makes sense - then you could use a switch instead of a splitter. With a switch, whatever is selected would get an undiminished signal. Some time ago these were common, intended as an antenna/cable switch to choose between sources for an analog TV, and you can still get them... but be sure it has the desired connectors (probably F-type) and is intended for the desired impedance (75 ohms as used with TV gear, not 50 ohms as used with most other radio gear).
Brian B-P is offline   Reply With Quote
Old 05-02-2016, 05:53 PM   #6
Senior Member
 
thoer's Avatar
 
Join Date: Oct 2009
Location: Galesville, Wisconsin
Trailer: 2017 21 "Blue II" & 2017 Highlander XLE (previously 2010 17B "Blue" & 2008 Tacoma)
Posts: 3,955
Thanks Brian - yep I remember those splitter switches, cause I'm old!
__________________
Eric (and Mary who is in no way responsible for anything stupid I post)

SAE Towing Standard "Beware of false knowledge; it is more dangerous than ignorance." George Bernard Shaw
thoer is offline   Reply With Quote
Old 05-02-2016, 08:32 PM   #7
Site Team
 
Donna D.'s Avatar
 
Join Date: Nov 2008
Location: Portland, Oregon
Trailer: 2014 Escape 5.0 TA
Posts: 6,821
Quote:
Originally Posted by thoer View Post
Thanks Brian - yep I remember those splitter switches, cause I'm old!
You mean... an A/B switch?
__________________
Donna D.
Ten Forward
2014 Escape 5.0TA
Donna D. is offline   Reply With Quote
Old 05-02-2016, 08:50 PM   #8
Senior Member
 
Mike Lewis's Avatar
 
Join Date: Feb 2013
Location: Santa Rosa County, Florida
Trailer: 2014 Escape 21
Posts: 1,372
I have an amplified home TV antenna, a Channel Master SmarTenna 3000A. It works okay, but it has an FM trap that attenuates (blocks) the FM radio band 88-108 MHz. So be careful when buying an antenna for both TV and FM radio use.
__________________
Mike Lewis
She don't lie, she don't lie, she don't lie-- Propane.
Mike Lewis is offline   Reply With Quote
Old 05-02-2016, 11:54 PM   #9
Senior Member
 
Join Date: Dec 2012
Location: Edmonton, Alberta
Trailer: 1979 Boler B1700
Posts: 9,036
Quote:
Originally Posted by Donna D. View Post
You mean... an A/B switch?
Yep, but the ones you can find at a reasonable price that are actually suitable (not an audio switch, for instance) are likely to say "cable/antenna".

Quote:
Originally Posted by Mike Lewis View Post
I have an amplified home TV antenna, a Channel Master SmarTenna 3000A. It works okay, but it has an FM trap that attenuates (blocks) the FM radio band 88-108 MHz. So be careful when buying an antenna for both TV and FM radio use.
I agree. That's what this was about:
Quote:
Originally Posted by Brian B-P View Post
You might find some antennas (particularly with amplifiers) which include filters to exclude the bands that are not wanted, so a dedicated TV antenna might not work properly for radio, or vice versa... but the description should say so if this is the case.
That Channel Master's Amazon listing doesn't say it won't work for FM radio, but at least it clearly says HDTV (which is just "TV", as far as an antenna is concerned). Channel Master's own page for the CM-3000HD (same antenna?) refers only to TV.
Brian B-P is offline   Reply With Quote
Old 05-03-2016, 10:00 AM   #10
Senior Member
 
thoer's Avatar
 
Join Date: Oct 2009
Location: Galesville, Wisconsin
Trailer: 2017 21 "Blue II" & 2017 Highlander XLE (previously 2010 17B "Blue" & 2008 Tacoma)
Posts: 3,955
The 1byone vender replied to me and sent along the attached pdf. It shows 2 cables coming from the antenna, one for radio and one for TV. They also include connectors and plates that allow a cable TV connection. With the external cable connection ETI offers, to my inexpert eyes, this appears to be an ideal solution to radio/over the air TV/cable TV connections for an Escape.

Currently the vendor only sells thru Amazon US, but I asked if they could make it available thru Amazon Canada so that I could have it shipped directly to ETI.
Attached Files
File Type: pdf OUS00-0812.pdf (233.3 KB, 21 views)
__________________

__________________
Eric (and Mary who is in no way responsible for anything stupid I post)

SAE Towing Standard "Beware of false knowledge; it is more dangerous than ignorance." George Bernard Shaw
thoer is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off






» Virginia Campgrounds

Reviews provided by



All times are GMT -5. The time now is 07:37 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Copyright 2012 Social Knowledge, LLC All Rights Reserved.