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Old Yesterday, 03:30 PM #2191
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Quote:
Originally Posted by ToolAA View Post
I was reading that if you mount to the bumper it effects the effective transmission pattern.

I would like a 1/4 wave 19” antenna on the roof angled backwards about 45° would be reasonably effective. I could position it right in the middle rear of the roof. I cannot find any discussion to support or refute my idea. If it works it would only stick up 13” above the roof.
Really, not sure it really matters much. Your car doesn't sit still. It's on the road travelling in different directions with multiple terrain considerations. Also, you mostly communicate through repeaters. I wouldn't overthink it too much. I have had very good results with it on the back hatch.

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Old Yesterday, 03:54 PM #2192
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Quote:
Originally Posted by ToolAA View Post
I was reading that if you mount to the bumper it effects the effective transmission pattern.

I would like a 1/4 wave 19” antenna on the roof angled backwards about 45° would be reasonably effective. I could position it right in the middle rear of the roof. I cannot find any discussion to support or refute my idea. If it works it would only stick up 13” above the roof.
I've gotten some NiTinol antennas for HTs and like them.

https://signalstuff.com/antennas/

I was looking for a mobile version and couldn't seem to find one for the consumer market but did find a company that makes one for public service.

They aren't cheap, but the company says they'll replace it if it breaks.

http://sti-co.com/public-safety/flexi-whip/

https://www.theantennafarm.com/catal...f-ft-niti-6442

I haven't bought one yet, but like you, I frequently have to use garages and I have a spring-base center loaded antenna which takes a beating in some garages, especially those in downtown Annapolis.

When it fails or I get a new vehicle I'm going to get one of these.
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Old Yesterday, 04:05 PM #2193
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Quote:
Originally Posted by K31 View Post
I've gotten some NiTinol antennas for HTs and like them.



https://signalstuff.com/antennas/



I was looking for a mobile version and couldn't seem to find one for the consumer market but did find a company that makes one for public service.



They aren't cheap, but the company says they'll replace it if it breaks.



http://sti-co.com/public-safety/flexi-whip/



https://www.theantennafarm.com/catal...f-ft-niti-6442



I haven't bought one yet, but like you, I frequently have to use garages and I have a spring-base center loaded antenna which takes a beating in some garages, especially those in downtown Annapolis.



When it fails or I get a new vehicle I'm going to get one of these.

Thats pretty cool and the cost may be worth it.

Their covert model looks exactly like what I was thinking.
http://sti-co.com/covert/
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Old Today, 08:09 PM #2194
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Question for you more experienced guys.

I got my homemade J-Pole antenna mounted up in my attic today at the peak of the roof. I got a really good shielded cable too.

So I’m picking up a lot of digital signals that were not evident with the little antennas that came with the RTL-SDR. So out of curiosity I started to try and find out what these signals are. Using the FCC database and Radio reference.com most of them are public and private trunk networks.

However I am getting a fairly strong periodic signal in Ellicott City on 152.1800 Mhz. I cannot find any registered license or transmitter info.

Shouldn’t all digital transmitters be FCC registered and easily found in the database?

Any other ideas on how to ID this transmitter?
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Old Today, 08:19 PM #2195
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At that frequency, probably multi use commercial or maybe a paging system....can you provide a screen shot of the signal?
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Old Today, 08:30 PM #2196
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Quote:
Originally Posted by ToolAA View Post
I was reading that if you mount to the bumper it effects the effective transmission pattern.

I would like a 1/4 wave 19” antenna on the roof angled backwards about 45° would be reasonably effective. I could position it right in the middle rear of the roof. I cannot find any discussion to support or refute my idea. If it works it would only stick up 13” above the roof.
It would work fine on two meters. Most of them are just thin spring steel whips so really no need to bend it back, if it hits something it will just spring back in to place
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Old Today, 08:32 PM #2197
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Quote:
Originally Posted by ToolAA View Post
Question for you more experienced guys.

I got my homemade J-Pole antenna mounted up in my attic today at the peak of the roof. I got a really good shielded cable too.

So I’m picking up a lot of digital signals that were not evident with the little antennas that came with the RTL-SDR. So out of curiosity I started to try and find out what these signals are. Using the FCC database and Radio reference.com most of them are public and private trunk networks.

However I am getting a fairly strong periodic signal in Ellicott City on 152.1800 Mhz. I cannot find any registered license or transmitter info.

Shouldn’t all digital transmitters be FCC registered and easily found in the database?

Any other ideas on how to ID this transmitter?
I think it's a paging transmitter frequency, might be on a Nationwide license so might be harder to search up
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Old Today, 08:50 PM #2198
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Quote:
Originally Posted by rpker View Post
At that frequency, probably multi use commercial or maybe a paging system....can you provide a screen shot of the signal?


Here is a short video.

https://youtu.be/bKxq1POjXco
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