[OZAPRS] Grounding of HF Antenna for APRS

[vk4tec at tech-software.net]

Diamond HF30FX



-----Original Message-----
From: OZAPRS [mailto:ozaprs-bounces at aprs.net.au] On Behalf Of Glen English VK1XX
Sent: Monday, 4 December 2017 11:09 AM
To: ozaprs at aprs.net.au
Subject: Re: [OZAPRS] Grounding of HF Antenna for APRS

well, there are alot of assumptions for pre cut antennas on vehicles for HF.

So I wouldnt pay too much attention to SWR once it is below 2:1. What sort is it ? WHat model / URL ?


On 4/12/2017 11:58 AM, vk4tec at tech-software.net wrote:
> 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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