[OZAPRS] 145.175 MHz and 100Mb LAN interference

[Darryl Smith]

The other thing to watch is birdies from the TNC. Some TNC2's have a
trimcap
that can move the birdie. Others need a cap to move the birdie to another
frequency. The frequency is usually about 145.150 MHz or so... 

I just scanned that region here... I have about 4db difference in
background
levels on the 144/145 MHz band. 145.175 MHz was up about 3db from a few
hundred Hz either side, but nothing really major. This was right next to
the
server. I am running 10/100 with a 24 port VLAN hub. 

Darryl

---------
Darryl Smith, VK2TDS   POBox 169 Ingleburn NSW 2565 Australia
Mobile Number 0412 929 634 [+61 4 12 929 634 International] 
www.radio-active.net.au\blog\ - www.radio-active.net.au\web\tracking
 

-----Original Message-----
From: ozaprs-bounces at marconi.ics.mq.edu.au
[mailto:ozaprs-bounces at marconi.ics.mq.edu.au] On Behalf Of Gavin Rogers
Sent: Monday, 11 October 2004 4:22 PM
To: vk4tec at tech-software.net; ozaprs at marconi.ics.mq.edu.au
Subject: Re: [OZAPRS] 145.175 MHz and 100Mb LAN interference

At 03:35 PM 11/10/2004 +1000, you wrote:
>I have done some fault finidng on birdies on my APRS
>
>I found I wound my LAN back to 10Mb from 100Mb and the 145.175 MHz
birdies
>dissappeared
>
>Anyone else noticed this ?

Yep! I run 2m packet on 144.9, 147.575 and 145.175 and all 3 are affected 
by 100Mbit switching gear. I found that I had to put what I could on a 
10Mbit hub and  swap out my plastic-cased cheapie switch with a 
well-grounded metal cased switch (like the Netgear FS-108). Along with 
ferrites on *everything* it greatly reduced, but didn't eliminate the
noise.


73.
Gavin.

---
       Gavin Rogers                     |  Amateur radio station VK6HGR
     http://www.livingwaters.com/good   |     http://vk6hgr.ampr.org/
    ICQ: 17230395  MSN: VK6HGR  Skype/Email: grogers at vk6hgr.echidna.id.au

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