[OZAPRS] HF Frequencies

[Ray Wells]

Gerard Hill wrote:
> Ray Wells wrote:
>   
>> I think that wherever you move to you will run foul of bandplan 
>> differences and ultimately you'll be shifting again, and again. Given that;
>> a) by moving to 7035.33 (USB with 1600/1800Hz tones) I eliminated the 
>> problem of me clobbering weak PSK signals
>> b) I'm no longer running a BBS, so that's a lot less traffic.
>> c) there's only two stations left on 40m with a BBS
>> d) the low amount of beacon traffic HF aprs generates,
>>
>> it might be worth considering negotiating with VK2AAB (Sydney)  and 
>> VK2SLM (Casino) to share the frequency they use, or something fairly close.
>>     
>
> Moving to another frequency would bring with it a new set of problems 
> and may not solve the ones that we have. I find that 7036.5 is fine 
> during the day, but at night and during contests there can be voice 
> traffic down in that segment and occasionally CW. With the limited 
> bandwidth available on 40m I don't think we can expect to find a 
> frequency that is clear all the time. It is certainly a lot better than 
> above 7040.
>
> The BBSs are operating 3.17 kHz up the band and I don't think it is a 
> good idea to shift there either. APRS is all about transferring short 
> messages with weak signals from mobiles. BBSs are about fixed stations 
> sending long(er) bursts of data to each other. Channel utilisation is 
> much higher and I would not like APRS to compete, and I don't think it 
> needs to. I actually find the APRS frequency clearer than the BBS one. 
> Also, it allows users who want to access BBSs on 40m free reign.
>
> I think we should try and establish a good network on the frequency 
> we're on and encourage more utilisation, especially by mobiles.
>
> Cheers ... Gerard, VK2IO
>   
I certainly agree with Gerard with regard to moving above 7.040 and that 
moving anywhere will bring with it a new set of problems. We probably 
need to agree to disagree with regard to frequency sharing aprs with bbs 
traffic.

Since I no longer operate a bbs, any possible conflict with aprs on a 
shared frequency is irrelevant to me but given that I "might" install a 
rx only 40m aprs port, I still have some interest in what happens ;-)

Cheers, Ray vk2tv