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

[OE3MZC Mike]

Hi Steve,
usually on a sailing boat on sea (salt) water you will have much better
efficiency of your "mobile" antenna,
which will give the gain you need to make 5W QRP work...
compared to a mobile antenna on a 4x4 in the dry dessert.

Single hop - I meant a single ionosphere hop, because of additional losses
on ground reflection with multi hop.
See info abt DSP-TNC at
http://www.scs-ptc.com/shop/products/modems/tracker-dsp-tnc 

Vy 73 de Mike, OE3MZC

-----Original Message-----
From: ozaprs-bounces at aprs.net.au [mailto:ozaprs-bounces at aprs.net.au] On
Behalf Of Steve
Sent: Freitag, 10. Juni 2011 13:23
To: Australian APRS Users
Subject: Re: [OZAPRS] How much power do you use while HF mobile?

Hello Mike,

Just curious as to why 5W is acceptable only for boats? Is it about noise?
If so, why is that important at the TX end?
What are calling a single hop - do you mean a single ionosphere hop, or a
single digital hop?

Completely agree on you frequency accuracy comments. I use an MFJ1270B, MixW
and Unix Soundmodem, and they all like the signals to be pretty accurate.
Some stations are off from the crowd by many tens of Hertz! I'd love to see
how one of those DSP modems go. I reckon they would be great.

Anyway, I love the QRP/QRO debate - Lacking an order of magnitude of
"acceptable" power has never stopped me from passing traffic!

Steve Z.



So my opinion: 5W hf-APRS only works on sailing boat within single hop
distance to gate.
vy 73 de OE3MZC/VK3FPF


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