[OZAPRS] 40m good but wierd

[Rob]

Hi All this is explained by the fact that most TNC's have a 50Hz passband
and most rigs don't TX and RX on the same frequency to much better than
20Hz. This means that you can get odd combinations of stations some
receiving some and not others it's just that we are all not on the correct
frequency. We do need a master station but it needs to have its TX and RX
correct to better than 5Hz.

I have a SCS TNC coming next week that will fix the RX at my end as it has a
400Hz passband if I can lock my RX in frequency and I can measure other
stations off set then we have a shot of at least correcting every body over
a day or to the right frequency. I need to see if my GPS reference will work
it's a bit temperamental but if it will go it will at least enable my to get
my RX correct to a few Hz But I don't now how stable my RX will be over
time.

Regards Rob ZL3RX


-----Original Message-----
From: ozaprs-bounces at aprs.net.au [mailto:ozaprs-bounces at aprs.net.au] On
Behalf Of David and Justine Olsen
Sent: Friday, April 03, 2009 10:32 PM
To: Tony Hunt; Australian APRS Users
Subject: Re: [OZAPRS] 40m good but wierd

My radio is 0.5ppm but my sound card not perfect. I am happy to set  
myalias to TUNE if you all want to give it a go.

David

VK4MDX


On 3 Apr 2009, at 19:28, Tony Hunt wrote:

> Well in about the last 24 hours 40m seems to have proved good. As  
> opposed to
> about 5-6 days on 20m this last week. 40m seems better now than it  
> was this
> time last week. This is possible becuase my noise levels seem to have
> dropped also.
>
> Within a couple of hours I heard about 4 stations regularly last  
> night. Ive
> also noticed some RTTY spot on our channel . Maybee some of you are  
> playing
> sound cards with RTTY as well.
>
> So far Ive heard on AX25 APRS in no particular order
> VK2KCM-4
> VK7HSE-2
> VK5EX-4
> VK2XGJ-15
> ZL3RX
> VK3JFK-5
>
> Interestingly nothing from VK4 and I notice that they are hearing  
> stuff that
> Ive never seen yet also like VK2SLM possibly because hes 400 Hz  
> High by the
> looks. Its almost like we are on different frequencies or planets  
> to the
> VK4s etc ..
>
> But alas we must be on the same frequencies because your seeing the  
> same
> stuff I am seeing from VK2 and ZL arent you ?? Its wierd because I  
> am seeing
> ZL3RX but VK4JRC was seeing ZL3RX-4 .. Yet VK4JRC is seing me ..  
> Odd stuff.
>
>
> Tony Hunt  VK5AH
>
>
> _______________________________________________
> Ozaprs mailing list
> Ozaprs at aprs.net.au
> http://aprs.net.au/mailman/listinfo/ozaprs

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