[OZAPRS] allowing for cable..10.147 MHz antenna

Peter Dodd dodd.pc at bigpond.com
Mon Dec 11 13:44:28 AEDT 2017


Hi Glen,

Thanks for calculations.

System seems to be working well into VK2 gates.

Off to VK5 in a couple of days, will see how it performs

Cheers

Peter VK7KPC-15

----- Original Message ----- 
From: "Glen English VK1XX" <glenlist at pacificmedia.com.au>
To: <ozaprs at aprs.net.au>
Sent: Monday, December 11, 2017 11:09 AM
Subject: [OZAPRS] allowing for cable..10.147 MHz antenna


> 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
>>>>>
>>>>> ------------------------------------------------------------------------
>>>>>
>>>>> _______________________________________________
>>>>> OZAPRS mailing list
>>>>> OZAPRS at aprs.net.au <mailto:OZAPRS at aprs.net.au>
>>>>> http://lists.aprs.net.au/mailman/listinfo/ozaprs
>>>>>
>>>>> _______________________________________________
>>>>> OZAPRS mailing list
>>>>> OZAPRS at aprs.net.au <mailto:OZAPRS at aprs.net.au>
>>>>> http://lists.aprs.net.au/mailman/listinfo/ozaprs
>>>>
>>>> ------------------------------------------------------------------------
>>>>
>>>> _______________________________________________
>>>> OZAPRS mailing list
>>>> OZAPRS at aprs.net.au
>>>> http://lists.aprs.net.au/mailman/listinfo/ozaprs
>>>>
>>>>
>>>>
>>>> _______________________________________________
>>>> OZAPRS mailing list
>>>> OZAPRS at aprs.net.au
>>>> http://lists.aprs.net.au/mailman/listinfo/ozaprs
>>>
>>>
>>> _______________________________________________
>>> OZAPRS mailing list
>>> OZAPRS at aprs.net.au
>>> http://lists.aprs.net.au/mailman/listinfo/ozaprs
>>>
>>
>> _______________________________________________
>> OZAPRS mailing list
>> OZAPRS at aprs.net.au
>> http://lists.aprs.net.au/mailman/listinfo/ozaprs
>
>
> _______________________________________________
> OZAPRS mailing list
> OZAPRS at aprs.net.au
> http://lists.aprs.net.au/mailman/listinfo/ozaprs
> 



More information about the OZAPRS mailing list