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Need Help Identifying This Antenna !
- Thread starter EVAC810
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ka3jjz
Wiki Admin Emeritus
I'm betting KDT (keyed data terminal) of some kind...rather too large for a GPS Best Regards...Mike
W2NJS
Member
I run a similar UHF antenna on the roof of my Outback. Mine has a claimed 3db gain and works very well. I no longer hear the whip hitting the sprinkler pipes when I'm in a parking garage. Most of the commercial manufacturers make these units.
suriname
Member
W2NJS, got a source for us ? Tnx !!!
methusaleh
Member
Antenex and Maxrad make versions of that, along with many other companies I would imagine.
Personally I prefer the more "miniature soda can" shaped vertical, like the black one in the photo, for UHF. They too have claimed 3dB of gain.
An agency I worked for had the pancake style ones for UHF (analog voice) on some cruisers. When we got rid of them and went to good ol' simple 1/4 wave whips (like our 1990s-era cruisers had), there seemed to be unanimously much better signal strength. While this is my opinion based on my observations, I know I was not imagining it in some places that had been complete dead zones with the pancake style antenna.
Personally I prefer the more "miniature soda can" shaped vertical, like the black one in the photo, for UHF. They too have claimed 3dB of gain.
An agency I worked for had the pancake style ones for UHF (analog voice) on some cruisers. When we got rid of them and went to good ol' simple 1/4 wave whips (like our 1990s-era cruisers had), there seemed to be unanimously much better signal strength. While this is my opinion based on my observations, I know I was not imagining it in some places that had been complete dead zones with the pancake style antenna.
Tech792
Member
My agency uses a pancake antenna about that size. Its a dual band antenna that houses both GPS and cellular for the mobile computers.( If I remember correctly,its 1900 mhz and 890 mhz)
Too large for GPS/Cell; definitely a UHF model. Here's a link:
Larsen Mirage
Edited to add: Also, IMO, not worth a darn unless used at low power. We've seen too many burn out. Stick with the 1/4 waves if you need a small antenna.
Larsen Mirage
Edited to add: Also, IMO, not worth a darn unless used at low power. We've seen too many burn out. Stick with the 1/4 waves if you need a small antenna.
Last edited:
W2NJS
Member
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My source is Comtelco. The UHF units are about $35 on a factory-direct order, and claim a 3db gain. They mount on an NMO setup. Check the Comtelco catalog; you have to specify a UHF range when ordering.
http://comtelco.net/PDF/A2543B.PDF
W2NJS
Member
That Comtelco URL I posted doesn't work. The antenna is a Comtelco A2543B.
Good guesses, but I believe that is an AntennaPlus Navigator combo antenna (Cell/PCS/GPS/possibly WiFi as well)
Antennas | Cellular Antennas | GPS Antennas | PCS Antennas | WiFi Antennas | Radio Antennas
Antennas | Cellular Antennas | GPS Antennas | PCS Antennas | WiFi Antennas | Radio Antennas
mformby
Member
The center antenna is a 700/800 MHz antenna. The pancake is probably data and gps. The fiberglas antennas like the one in the center of the trunk have a small PC board in them which gives them a specific "electrical" frequency. They do not work as well as the equivalent quarter wave, even though they advertise a 3db gain. I called Antenna, Inc. and talked to an engineer. He said that was a 3db gain over isotropic, which means basically outer space. I tried the UHF version compared to a 6" quarter wave on our Trident UHF trunked radio system which requires a radio to be logged on to the system sorta like a cellular phone does. I drove to a marginal area, removed the quarter wave and replaced it with the so called 3db gain mobile and it never logged on. I removed it and reinstalled the quarter wave antenna and it logged on. Bottom line is the better at on third the price.
kayn1n32008
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Gonna go with a combo gps/cellular. Our city police service use somthing that resembles that.
Gonna go with a combo gps/cellular. Our city police service use somthing that resembles that.
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