[OZAPRS] Some HF questions

[Andrew Rich]

Using AGWPE as a modem at the moment.

Considering an external TNC.

Suggestions ?

SCS have a nice DSP version.

Also, my friend ten years back swore by horizontal loop antenna, any good
?

-----------------------------------------
Andrew Rich
Amateur radio callsign VK4TEC
email: vk4tec at tech-software.net <mailto:vk4tec at tech-software.net> 
web: http://www.tech-software.net
Brisbane AUSTRALIA 



-----Original Message-----
From: Hamish Moffatt [mailto:hamish at cloud.net.au]
Sent: Monday, 9 April 2007 11:49 PM
To: ozaprs at aprs.net.au
Subject: Re: [OZAPRS] Some HF questions


On Mon, Apr 09, 2007 at 05:35:38PM +1000, Andrew Rich wrote:
> 1. I am running coax to a dipole for RX, should I need a 1:1 balun ?

It may reduce the SWR. Just roll up a few turns of coax near the
feedpoint; that will act as a balun. (More important for transmit that
receive really.)

> 2. Would a narrow(er) filter help on HF for packet rx ?

Narrow filters only help if you have strong signals within the audio
passband which cause the AGC to reduce the packet signal. Ie probably
not.

> 3. What help if any are DSP filters to HF packet ?

Unlikely to be any help. What are you using as the packet modem?

Hamish
-- 
Hamish Moffatt VK3SB <hamish at debian.org> <hamish at cloud.net.au>
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