[OZAPRS] Grounding of HF Antenna for APRS

vk4tec at tech-software.net vk4tec at tech-software.net
Mon Dec 4 11:58:24 AEDT 2017


I went to see an engineer mate 

He gave me some brass plate 

I am cutting out a plate that will have a braid strap coming off it 

That should do the trick - he said the VSWR should come down even further 

Nudge bars are $1000 

Andrew 

-----Original Message-----
From: OZAPRS [mailto:ozaprs-bounces at aprs.net.au] On Behalf Of Glen English VK1XX
Sent: Monday, 4 December 2017 7:35 AM
To: ozaprs at aprs.net.au
Subject: Re: [OZAPRS] Need a hand

yeah that will work. it would be out of the weather, and get covered with oil/grease and probably weather seal it.

being close to the feedpoint actually isnt that necessary, maybe no more than 1/20 of a wavelength, though , that is probably a good number. so max strap length 1.5m for that freq.


On 4/12/2017 8:27 AM, vk4tec at tech-software.net wrote:
> Glen
>
> I am thinking that maybe just a strap that fits in the gap between the bonnet and the side wall.
>
> I can sink a screw into the bonnet just inside
>
> That way it would be as close to the feed point as possible
>
> I would drill into the top side of the bonnet but that equals a 
> divorce LOL
>
> -----Original Message-----
> From: OZAPRS [mailto:ozaprs-bounces at aprs.net.au] On Behalf Of Glen 
> English VK1XX
> Sent: Monday, 4 December 2017 7:23 AM
> To: ozaprs at aprs.net.au
> Subject: Re: [OZAPRS] Need a hand
>
> In looking for a place to attach a ground strap, consider that ideally, you want the largest continous area of metal. That is probably the engine bay firewall (which would attach to the upper body, roof etc) , fender mounts,  or in the rear, hinge mounts of the rear hatch, etc.
>
> Anyone else have any input here  on where to connect on a modern vehicle to maximise surface area ?
>
> comeon. ???
>
> I am a bit out of tough on modern vehicles. (I have a 2005 XC90 which 
> if you pass a RG58 through a door seal will squash it flat and cause a 
> short... hence requiring coax entry through a bung in the spare tyre 
> well under the vehicle)
>
>
>
>
>
>
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