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 Motorhome antenna

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Speidy
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Speidy


Call Sign : 26CT2192
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Join date : 2020-04-05
QTH or Location : Bedfordshire
Equipment Used : SSB, FM
Age : 58

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PostSubject: Motorhome antenna   Motorhome antenna Icon_minitimeSun Sep 29, 2024 12:15 pm

Hello. A little advice please....
Taken my magmount from car and put it on van roof. Van roof is aluminium, so I have screwed a steel square plate to roof an attached magmount. Swr on car was great through all channels 27ukfm and great on 555 usb also.
On van the best I can get is swr of 2.5 on ch 1 & 40 and 1.5 on ch20 on 27ukfm. Not tried the multi band radio as too scared. 
Contact between aluminium and steel is good. 
Tried different antennas and just as bad if not worse.
This is a trial to see if it works well before making a hole in roof.
Any help appreciated.
Thanks
Gary
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VanRougeT4
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PostSubject: Re: Motorhome antenna   Motorhome antenna Icon_minitimeSun Sep 29, 2024 1:04 pm

It could be that your magmount on the car wasn't electrically connected to the roof, but was achieving a low swr by means of capacitance.

Deb
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Speidy
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PostSubject: Re: Motorhome antenna   Motorhome antenna Icon_minitimeSun Sep 29, 2024 6:20 pm

Thanks for reply. The antenna on the car works a treat. Thinking outside the box, would the fact it's going from steel to aluminium make any difference? Thanks
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VanRougeT4
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VanRougeT4


Call Sign : G1DBS - F4WEY
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PostSubject: Re: Motorhome antenna   Motorhome antenna Icon_minitimeMon Sep 30, 2024 12:55 am

Speidy wrote:
Thanks for reply. The antenna on the car works a treat.  Thinking outside the box, would the fact it's going from steel to aluminium make any difference? Thanks

Probably not, but other reasons for a different match might be that the vehicle is the ground plane, the van roof is probably bigger than the car. If the antenna isn't electrically connected to the roof, then the way the coax is routed will also have an effect. To be honest, I'd forget about how the antenna worked on the car and adjust for lowest swr on the van. If you can't get a low swr on the van try grounding the rig to the van body. If all else fails, you could use an antenna analyser to see where the antenna is resonant. Also, check the coax, if it's been jammed in a door, it might be damaged.

Deb
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Speidy
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PostSubject: Re: Motorhome antenna   Motorhome antenna Icon_minitimeMon Sep 30, 2024 5:55 pm

Many thanks for advice. Will try what you suggested. Thanks again.

VanRougeT4 likes this post

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