[OZAPRS] Yaesu VX8GR performance?

Thu Aug 2 19:32:43 EST 2012

FYI

Most of the VK3 APRS digis run MFJ1270 TNCs and FM-828 radios.

The Pre/Dephasis on these digis is by passed as we found through testing
(about 10 or so years ago) that this worked best for decoding most weak RF
transmissions. (It was also understood that the Kenwood APRS radios of the
day reduced or bypassed Pre/Dephasis for APRS)

I don't know how this would affect the decoding of the VX8GR transmissions
as they weren't around at the time.

Cheers
Richard
VK3JFK

-----Original Message-----
From: ozaprs-bounces at aprs.net.au [mailto:ozaprs-bounces at aprs.net.au] On
Behalf Of Andy Nguyen
Sent: Wednesday, 1 August 2012 5:16 PM
To: Tony Hunt; Australian APRS Users
Subject: Re: [OZAPRS] Yaesu VX8GR performance?

Thanks Tony,
That explains things a bit, I did some tests with my VX8DR and could not get
the beacons to the Digis in Melbourne, even with an external base antenna.
Could trigger my own software TNC though, with carefully adjusted levels on
the TNC side.
Will try the deviation and see how that goes.
Regards,
Andy

On 01/08/2012, at 2:03 PM, Tony Hunt wrote:

> Andrew. There is nothing wrong with the Format of the packets as such.
Thats like saying its not APRS standard compliant.
> 
> I have a VX8R here. The issue with the 8R is the lack of deviation. Some
Digis/TNC combos are not giving a reliable decode because of the lack of
Audio (tone level) reaching the TNCs discriminator input.
> I found with the VX8R that I could get into the service menu and bump up
the VHF deviation/audio level. This worked a treat and improved the decode
no end. The one drawback was that it also bumped up the level on voice. Its
a single adjustment. So the trick is a compromise between the two and to
remember not to yell into the microphone when using 2m voice. If your happy
with that then fine. Personally I find it a bit disappointing but at least
its possible to get something going as a work around with this problem.
> 
> It becomes a real pain if your travelling around the country and have it
all working and tested ok at home with your local network and you drive
interstate and find that your APRS really lacks and does not track very well
if at all. The deviation is that marginal and works ok in some situations
and in others it will refuse to work at all. Just bump up the deviation and
its all sorted.
> 
> Tony Hunt  VK5AH
> 
> - Original Message -----
>> From: Andrew Scott <mail at asphotos.com.au>
>> To: Australian APRS Users <ozaprs at aprs.net.au>
>> Subject: [OZAPRS] Yaesu VX8GR performance?
>> Message-ID: <07259806-28B0-4FDE-9065-0470B0C7C18B at asphotos.com.au>
>> Content-Type: text/plain; charset="us-ascii"
>> 
>> hello all
>> 
>> does anyone have a VX8gr, and how do they find it performs on aprs in oz?
ive read that some digipeaters do not like its format?? but haven't been
able to find anything specific?  see below.
>> 
>> **
>> 
>> VX-8GR APRS notes
>> 
>> We have found that some TNCs
>> won't work properly, or at all, with the VX-8GR when in APRS mode.
>> This is apparently due to the VX-8GR's format being different to other
Yaesu transceivers' format/s.
>> Fortunately, a customer recently told us his Tiny Track 4 TNC works
excellently with his VX-8GR.
>> Other similar format/design TNCs may work excellently, too.
>> 
>> **
>> 
>> looking for a new handheld, and this might achieve a couple of tasks in
one package.. as long as it plays nicely with australian aprs networks..
>> 
>> thanks
>> 
>> vk3bq
>> Andrew Scott
>> mail at asphotos.com.au
>> 0411101021
>> 
>> 
>> 
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>> Message: 2
>> Date: Wed, 1 Aug 2012 07:30:48 +1000
>> From: Tim <timlog at bigpond.com>
>> To: Australian APRS Users <ozaprs at aprs.net.au>
>> Subject: Re: [OZAPRS] Yaesu VX8GR performance?
>> Message-ID: <0C8E2915-2060-4D9B-B4AF-8773B3F271F4 at bigpond.com>
>> Content-Type: text/plain; charset="us-ascii"
>> 
>> Mine works ok Andrew around here thru our Tiny 2 based digis. Getting the
RF out is a bit of a problem, the factory antennas not real flash, but it
works.  I use it for hiking and cycling. I have used the D700 in the car as
a local crossband a couple of times to help me when away from the digi.
>> 
>> Sent from my iPad
>> 
>> On 01/08/2012, at 7:13 AM, Andrew Scott <mail at asphotos.com.au> wrote:
>> 
>>> hello all
>>> 
>>> does anyone have a VX8gr, and how do they find it performs on aprs in
oz? ive read that some digipeaters do not like its format?? but haven't been
able to find anything specific?  see below.
>>> 
>>> **
>>> 
>>> VX-8GR APRS notes
>>> 
>>> We have found that some TNCs
>>> won't work properly, or at all, with the VX-8GR when in APRS mode.
>>> This is apparently due to the VX-8GR's format being different to other
Yaesu transceivers' format/s.
>>> Fortunately, a customer recently told us his Tiny Track 4 TNC works
excellently with his VX-8GR.
>>> Other similar format/design TNCs may work excellently, too.
>>> 
>>> **
>>> 
>>> looking for a new handheld, and this might achieve a couple of tasks in
one package.. as long as it plays nicely with australian aprs networks..
>>> 
>>> thanks
>>> 
>>> vk3bq
>>> Andrew Scott
>>> mail at asphotos.com.au
>>> 0411101021
>>> 
>>> 
>>> 
>>> _______________________________________________
>>> OZAPRS mailing list
>>> OZAPRS at aprs.net.au
>>> http://lists.aprs.net.au/mailman/listinfo/ozaprs
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