[OZAPRS] Proposed digi for Mt Nardi

Steve Sharp sharpst at gmail.com
Tue Aug 10 09:27:12 EST 2010


The tech got back to me with the following:

"Antenna Gain is going to be 3db to start with but then unity when we get
around to putting the 2m repeater up there ,  HAAT not
sure what it means but antenna hight is 83m above ground or 883m above sea
level"

Sound about right?

Steve VK2POO

On 10 August 2010 07:48, Ray Wells <vk2tv at exemail.com.au> wrote:

> Hi Steve,
>
> From SPLAT!, the pgrogram that produced the plots, HAAT is 2073.38 ft. I
> guessed an antenna height of 300 ft when I did the plots. Take the
> difference between 300 and the "real" antenna height and add/subtract from
> 2073 and you'll have your figure.
>
>
> Typical antennas gains are
> 1. dipole - probably 1dB in some direction, depending on distance from
> support mast
> 2. 2 x dipole - 3dB
> 3. 4 x dipole - 6dB
> 4. double extended Zepp (each dipole half = 5/8) 3dB
> 5. 3 halfwaves in phase = 3dB
>
> An error of 1-2dB in your "guess" will be mostly insignificant on the
> radius of the resulting coverage circle.
>
> Cheers ... Ray
>
>
>         --==[ SPLAT! v1.2.1 Site Analysis Report For: Nardi ]==--
>
> ---------------------------------------------------------------------------
>
> Site location: 28.5447 South / 206.7138 West (-28� 32' 40" S / 206� 42' 49"
> W)
> Ground elevation: 2608.27 feet AMSL
> Antenna height: 300.00 feet AGL / 2908.27 feet AMSL
> Antenna height above average terrain: 2073.38 feet
>
> Average terrain at   0 degrees azimuth: 689.75 feet AMSL
> Average terrain at  45 degrees azimuth: 756.54 feet AMSL
> Average terrain at  90 degrees azimuth: 1060.91 feet AMSL
> Average terrain at 135 degrees azimuth: 1151.16 feet AMSL
> Average terrain at 180 degrees azimuth: 686.42 feet AMSL
> Average terrain at 225 degrees azimuth: 585.24 feet AMSL
> Average terrain at 270 degrees azimuth: 919.58 feet AMSL
> Average terrain at 315 degrees azimuth: 829.48 feet AMSL
>
> ---------------------------------------------------------------------------
>
>
>
>
>  On 09/08/10 18:28, Steve Sharp wrote:
>
> G'day Ray - project is on the move again - the GM300 has been repaired and
> aligned and I have taken a look at the digi_ned link you sent regarding PHG
> and I'm sure we can add it as soon as the tech tells me the HAAT and gain of
> the antenna.
>  At this stage I have to program up the Foxdigi witht he site info and
> post it away to the installer who will get it up on Nardi next time he is
> workign at the site.
>
> Hopefully this'll kick interest along and we'll get some others up in the
> months to follow.....
>
> 73 de Steve VK2POO
> On 23 July 2010 13:36, Ray Wells <vk2tv at exemail.com.au> wrote:
>
>> Hi Steve,
>>
>> PHG is (P)ower, (H)eight, (G)ain and is sent in a beacon as in this UIDigi
>> example from VK2RMC-1. Software that handles PHG will display a coverage
>> circle around the digi site based of the information transmitted by the
>> digi.
>>
>> Beacon1Text            =       !3056.77SS15243.92E#PHG5513/ Kempsey, NSW
>>
>> Beacon2Text            =       !3056.77SS15243.92E#PHG5513/ Kempsey, NSW
>>
>> Beacon3Text            =       :146.875- *111111z3048.00S/15255.00Er R50k
>>
>>
>> The 5513 says
>> 5     25W
>> 5     antenna 320 feet above average terrain
>> 1    1dB antenna gain
>> 3    pattern offset towards 135 degrees.
>>
>> Take a look here for further explanation
>>
>> http://digined.pe1mew.nl/?How_to:Calculate_PHG_information
>>
>> The extra S after Latitude causes a green star with the letter S to be
>> displayed as the digi icon.
>>
>> Beacons 1 and 2 are identical except for the path. Beacon 1 has no path
>> set so it is not transmitted beyond the local digi. Beacons 2 and 3 have a
>> path of WIDE2-2 so that the beacon will be digied over two hops.
>>
>> Beacon 3 is reporting the frequency and offset (146.875-), time, location
>> and range of the local voice repeater. The series of 1's indicates that time
>> is not set
>>
>> Howzat?
>>
>> Ray vk2tv
>>
>>
>> On 23/07/10 12:53, Steve Sharp wrote:
>>
>> G'day Ray - Ok, I said I was new, so what is PHG apart from a TLA?
>>
>> Steve
>>
>> On 23 July 2010 12:45, Ray Wells <vk2tv at exemail.com.au> wrote:
>>
>>> Steve,
>>>
>>> Wow! Nardi is a great site and will provide good coverage of northern
>>> vk2.
>>>
>>> Just a suggestion, can you include PHG in your beacon for PHG circle
>>> display?
>>>
>>> Well done.
>>>
>>> Regards, Ray
>>>
>>>
>>>
>>> On 23/07/10 12:12, Steve Sharp wrote:
>>>
>>>  I'm building up a digi for the Summerland club who are going to place
>>> it on Mt Nardi. http://tinyurl.com/Mt-Nardi
>>>
>>> Now I'm the first to put my hand up and say I'll have a go - but sadly my
>>> skill set is a little light so I thought it best to get some feedback from
>>> people who have more experience in this field and hopefully get it right the
>>> first time;-)
>>>
>>> I'm using a foxdigi and seem to be getting the desired effect and it is
>>> repeating (most) of the packets it receives from VK4RGC-3.
>>>
>>> I have configured it thus, but not sure that I have the optimum
>>> settings yet....(obviously MYCALL and the BTEXT location will be changed for
>>> it's installation site)
>>>
>>> ECHO ON
>>> TXDELAY 64
>>> GPS $GPGGA
>>> TRace OFF
>>> MONitor ALL
>>> DIGIpeater ON
>>> BEACON On EVERY 30
>>> UNPROTO WIDE1-1 V WIDE2-2
>>> MYCALL VK2POO-3
>>> MYALIAS WIDE2-1
>>> BTEXT !2814.23s/15330.09e#/FoxDigi Testing for SARC
>>>
>>> Any tweaks?
>>>
>>> 73 Steve VK2POO
>>>
>>>
>>>
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>>>
>>>
>>>
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>>>
>>
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