[OZAPRS] Need a hand

[Peter Wicklein]

Andrew,



I have found mag mounts not to work to well, as they often do it earth well. Try an angle mount and attack to the pont were the side fender bolts the engine wall. Usually a 10mm socket to undo.. I get a 1:1 match on a base loaded diamond whip. If you  used a centre loaded version, you wouldn't have earthing issues, but they are not a physically strong.



Regards

Pete



Sent from my Windows 10 phone



________________________________
From: OZAPRS <ozaprs-bounces at aprs.net.au> on behalf of Andrew Rich <vk4tec at tech-software.net>
Sent: Sunday, December 3, 2017 8:22:19 PM
To: Australian APRS Users
Subject: Re: [OZAPRS] Need a hand

Both a bonnet mount and maggy mount in center of roof

Diamond 30 meter vertical

Radio is only connected via cigarette lighter

Getting 6:1 and 9:1

Vna dips but vswr is 6:1

Might try my vhf whip on vna

Not sure car and antenna base are grounded

Like something is floating

I need to measure ohms to chassis

Rg58 only 4 Meters

Radio ground only by power lead

Vna is floating

Not tried any ground straps yet

A


Sent from my iPhon

> On 3 Dec 2017, at 5:56 pm, Glen English VK1XX <glenlist at pacificmedia.com.au> wrote:
>
> hi Andrew
>
> Please do ya best to answer the following barrage of questions and I may be able to assist :
>
> but all questions need to be answered to solve the crossword...
>
> 1) what is the whip.
>
> 2) where is it located, precisely
>
> 3) does the ground on the base of the whi[ measure 0 ohms to the chassis ?
>
> 4) how long RG58 lead in ?
>
> 5) Is the radio grounded via a local ground short strap/thick wire to earth bolt or only its negative power lead ?
>
> 6) does it dip below 2:1 VSWR anywhere when you sweep it with a VNA ?
>
> 7) With the VNA, is the VNA grounded, or floating on the end of the  coax?
>
> 8) With the VNA, if floating, does the VNA indicated sweep/match change if you ground the outer of the VNA coax connector to a local ground like ground bolt ona  door hinge etc
>
>
>
>
>> On 3/12/2017 6:42 PM, Andrew Rich wrote:
>> I bought a 30 m whip for the car
>>
>> Can’t get better than vswr 6:1
>>
>> I was told I need to ground the base
>>
>> Also cigarette lighter maybe not enough current ?
>>
>> 10.147 MHz
>>
>> Andrew
>>
>> Sent from my iPhone
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