[OZAPRS] allowing for cable..10.147 MHz antenna

Glen English VK1XX glenlist at pacificmedia.com.au
Mon Dec 11 11:09:11 AEDT 2017


4m down coax , assumign RG58 Vc=0.67

length = 5.97m electrical or 73 degrees or 0.2 wavelengths

actual antenna Z = 37-j2.5

which is good, really, R down where I'd hope it was.



On 10/12/2017 6:23 PM, Peter Dodd wrote:
> Hi,
>
> measured down approx 4m coax using rigexpert AA-520.
>
> Didn't get a Site Master as retirement/VR gift
>
> Regards
>
> Peter
> ----- Original Message ----- From: "Glen English VK1XX" 
> <glenlist at pacificmedia.com.au>
> To: <ozaprs at aprs.net.au>
> Sent: Sunday, December 10, 2017 5:47 PM
> Subject: Re: [OZAPRS] 10.147 MHz antenna
>
>
>> Hi Peter
>>
>> Good numbers !
>>
>> was the feedpoint short-open-load compensated, or is this measured 
>> down some coax, if so , how long approx ?
>>
>>
>> On 10/12/2017 4:05 PM, Peter Dodd wrote:
>>> Hi Andrew,
>>> 1.34:1 at 10.147 MHz
>>> R= 57 Ohms
>>> X=13.7 Ohms
>>> Dip in X is a bit higher in frequency but can't shorten antenna 
>>> without cutting.
>>> A bit more work on earthing connections required
>>> Peter
>>>
>>>     ----- Original Message -----
>>>     *From:* Andrew Rich <mailto:vk4tec at tech-software.net>
>>>     *To:* Australian APRS Users <mailto:ozaprs at aprs.net.au>
>>>     *Sent:* Saturday, December 09, 2017 9:49 AM
>>>     *Subject:* Re: [OZAPRS] 10.147 MHz antenna
>>>
>>>     Is your antenna grounded
>>>
>>>     Have you done vswr sweeps
>>>
>>>     Sent from my iPhone
>>>
>>>     On 9 Dec 2017, at 8:21 am, Peter Dodd <dodd.pc at bigpond.com
>>>     <mailto:dodd.pc at bigpond.com>> wrote:
>>>
>>>>     Hi,
>>>>     Diamond HF30FX mounted on Rhino Rack on canopy of my DMax.
>>>>     With 30W tx heard by VK2ZZM and and VK2OL-5 this morning at about
>>>>     900 km
>>>>     Ignore mycall report that is my rx and multipsk software.
>>>>     $65000 and counting for mobile antenna mount
>>>>     Regards
>>>>     Peter VK7KPC-15
>>>>
>>>>         ----- Original Message -----
>>>>         *From:* vk4tec at tech-software.net
>>>>         <mailto:vk4tec at tech-software.net>
>>>>         *To:* 'Australian APRS Users' <mailto:ozaprs at aprs.net.au>
>>>>         *Sent:* Friday, December 08, 2017 8:36 PM
>>>>         *Subject:* [OZAPRS] 10.147 MHz antenna
>>>>
>>>>         Hello
>>>>
>>>>         I can go up but not out
>>>>
>>>>         Looking for suggestion for HF vertical for 10 MHz please
>>>>
>>>>         Andrew
>>>>
>>>> ------------------------------------------------------------------------ 
>>>>
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>>>
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>>
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>
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