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danielvi

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Dec 18, 2016
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11
Location
Norway
I didn't find any thread about GM so I'm making one.

If it's there allready, sorry, I'll erase this one.

The mast is 8,8 meters (28'), stuck in the soil and grounded. The base of antenna is about 3 meters (9') above a metal roof and the tip somewhere at 15 meters (49').

I wonder how the metal roof is affecting the radiation of antenna. (On CB band)

I'll apreciate any help.

Daniel
 

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jquittum

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Nov 7, 2004
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60
Mine arrives tomorrow. Still working on how to mount it.
I'd be interested to hear how yours is working.
 

danielvi

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Dec 18, 2016
Messages
11
Location
Norway
I've set up the GM 2 days ago, very easy to mount and nothing to tune, from the box SWR of 1,4 K40 and 1,5 K1. I could "pull" an 1,1 with an Z-11-PROII but I don't think it worth it.

I grounded the mast even the seller said I don't have to. (less noise maybe ?)

The test that I made was at 16-18 Km from GM with some hills and valleys between.

Before the GM I had a Moonraker GAP-F 5/8 in the same position, everything been the same the GM gave me at least 1 S more than GAP-F and on some places even 2 S.

I think a growth of 6 to12 dB compared with the Moonraker it's not bad.

I'll continue to test and I'll write more if you want.

Daniel
 

jquittum

Member
Joined
Nov 7, 2004
Messages
60
I do have a mast in place, but the upper portion is already occupied. I'll only be able to get the feedpoint of the GM about 8' above ground to start out. I'm hoping it will still work better than the broadbanded discone occupying the top of the mast.
I would certainly be interested in any more observations you make.
 

JayMojave

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Dec 13, 2007
Messages
668
Location
Mojave Ca
Hello Daniel: Your antenna installation looks good, the antenna is high enough that the metal roof probably doesn't have a hole lot of effect on the antenna.

Be advised: When a metal roof/building itself isn't grounded right or is grounded right, when static electricity is in the air, and charges the metal roof/building, a path of current can flow from the roof/building thru the antenna mast to ground. This causes a static noise in the receiver, that is difficult at best to identify.

A good friend went crazy trying to trouble shoot and fix this type of problem. Taking down the antenna and cleaning it, and double checking the antennas dimenations, and replaced the coax. All to no help.

What was found that the metal roof wasn't grounded and charged up with static electricity, then the static electricity current flowed from the metal roof down the mast into the ground causing this static electricity noise induced into the antenna and heard by the radio. The fix was to ground the metal roof, and insulate the antenna mast from the metal roof. This doesn't happen very often, but is possible. Hope you don't have such noise during heavy weather conditions.

I believe this type of noise is called snow noise.

See: https://www.youtube.com/watch?v=zgpnHgWswqc

Jay in the Great Mojave Desert
 
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