[OZAPRS] How much power do you use while HF mobile?

[OE3MZC Mike]

Damien,
in this case I would suspect that you are slightly OFF frequency!
Which is the most common error that reduces reliability of HF-APRS,
Because almost all I-Gates in VK use a modem that would require signal to be
tuned within 30Hz tolerance....
Only VK6UZ-4 in Perth uses a 800Hz wide-band decoding Hf-Gate.(at least to
my knowledge)
You can use his dF-Beacon to measure your QRG-offset.
See http://aprs.fi/?c=raw&call=VK6UZ-4

2011-06-10 10:23:52 UTC: VK6UZ-4>APRS,TCPIP*,qAC,DB0ANF-JS:>dF (Hz):
VK5ATN-15 +50, VK5LY-15 0, VK4KWI-15 +75, VK2AJ-15 +50
2011-06-10 10:23:53 UTC: VK6UZ-4>APRS,TCPIP*,qAC,DB0ANF-JS:>dF (Hz): KF7EU-6
+25, ZS6SS-3 +62, VK2TV-4 +87, VK3DHI-15 +59
2011-06-10 10:23:53 UTC: VK6UZ-4>APRS,TCPIP*,qAC,DB0ANF-JS:>dF (Hz): VP8DEU
+37, VK2DQC-15 +75, VK4DMI-4 +68, VK4HW-15 +43
2011-06-10 10:23:53 UTC: VK6UZ-4>APRS,TCPIP*,qAC,DB0ANF-JS:>dF (Hz):
VK4VP-15 +25, DL8RCB-3 +100, IW2GOB-10 +100, VK4KMR-15 +46
2011-06-10 10:23:53 UTC: VK6UZ-4>APRS,TCPIP*,qAC,DB0ANF-JS:>dF (Hz): F5LDS-4
+103, VK2SX-15 +50, LA4FPA-15 +87, VK7DIK-4 +46
2011-06-10 10:23:53 UTC: VK6UZ-4>APRS,TCPIP*,qAC,DB0ANF-JS:>dF (Hz): VK3MY-4
+71, VK3BZQ-9 +37, VK5LY-4 +34, VK4UN-15 +31
2011-06-10 10:23:53 UTC: VK6UZ-4>APRS,TCPIP*,qAC,DB0ANF-JS:>dF (Hz): VK8LM
+50, VK5LY-6 +37, VK3BDG-9 -18, VK5LY-5 +75
2011-06-10 10:23:53 UTC: VK6UZ-4>APRS,TCPIP*,qAC,DB0ANF-JS:>dF (Hz):
IW4EGP-4 +109, VK4HW-4 +28, DG9HR +93, DF8HL-1 +75

If you see your own call in the list and +93 next to it, then you should
tune +93Hz higher IF you use USB....
But always compare to the numbers next to the main hf-gate you want to
use...
Vy 73 de Mike
OE3MZC


-----Original Message-----
From: ozaprs-bounces at aprs.net.au [mailto:ozaprs-bounces at aprs.net.au] On
Behalf Of Damien Gardner Jnr
Sent: Freitag, 10. Juni 2011 12:28
To: Australian APRS Users
Subject: Re: [OZAPRS] How much power do you use while HF mobile?

True I think - having pulled into Nowra, and (temporarily) fixed my antenna,
with it lightly raining, and very overcast, I can't get a packet out even on
100W!  I even sat there for five mins turning the OT1+ on and off every 30
seconds, so it would keep sending posit packets, but not a brass razoo ended
up on the APRS network!

--DG

On 10/06/2011, at 8:06 PM, Gordon VK4VP wrote:

> Damien,
> 	I usually run about 70W mobile, but there are certainly locations 
> where it doesn't make much difference how much power you run, you have 
> trouble getting in.  The band conditions are what makes the difference 
> I think.
> 
> 
> 
> Regards,
> Gordo VK4VP
> 
> -----Original Message-----
> From: ozaprs-bounces at aprs.net.au [mailto:ozaprs-bounces at aprs.net.au] 
> On Behalf Of Damien Gardner Jnr
> Sent: Friday, 10 June 2011 18:35
> To: Australian APRS Users
> Subject: [OZAPRS] How much power do you use while HF mobile?
> 
> Hi Folks,
> 
> So I dug out a spare welding rod, and made a new tip for the 30 metre 
> whip on the the car, so I could run HF as well as VHF while we're away 
> this long weekend.  Didn't last long, it disappeared somewhere through 
> kangaroo valley, but we did get excellent coverage all the way down 
> till then :) Will go hunting around nowra tomorrow and see if I can 
> find a source of 3mm welding rods, or (haha not a chance) 3mm 
> stainless rod, but for now I picked up a $4 fold-out mosquito net 
> thingo from the camping section at kmart, for putting over a plate..  
> That had about 1mm rods in it, cut it to the 152mm I usually cut to, 
> but it was centered about 300khz too far up the band..  cut a new one 
> 3cm longer, and bingo, 1.1 swr on 10.1mhz :)  Gotta say having the LCD 
> backlight set to go from blue to red on SWR during transmit is absolutely
fantastic - you know straight away if something's wrong!
> 
> Anyway, my question - While i was giving the car a test-drive with the 
> antenna on, on thursday morning, I had my HF SSID appear on my D710 - 
> seems it was picked up somewhere and gated around about and ended up 
> out on VHF via an igate...  What did surprise me, was I still had the 
> 857 set to 5w, from tuning in the antenna!  Now I usually run 50w on 
> HF, but having done lots of playing with PSK31 and the like recently, 
> I'm realising that power really doesn't make a whole lot of difference 
> on HF, and having landed in noosa on 5w, I'm wondering if I need to be
running 50W..
> 
> Sooo - what power do folks usually run on HF APRS? :)
> 
> Cheers,
> 
> Damien
> 
> VK2TDG
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