[OZAPRS] Help with MJF-1270b and UI-View32

[Ray Wells]

Phil,

Time to start looking at levels and audio purity. For you, and anyone 
else on the list without a hardware CRO, download and install Visual 
Analyser 2011, a complete set of audio tools in one software package.

Ray vk2tv


On 30/12/2012 9:57 PM, Phil Kern wrote:
>
> Hi Ray, see below....
>
> *From:*ozaprs-bounces at aprs.net.au [mailto:ozaprs-bounces at aprs.net.au] 
> *On Behalf Of *Ray Wells
> *Sent:* Sunday, 30 December 2012 8:48 PM
> *To:* ozaprs at aprs.net.au
> *Subject:* Re: [OZAPRS] Help with MJF-1270b and UI-View32
>
> Phil,
>
> Things I would check .....
> 1. Is the comport speed set correctly to match the settings in the 
> application. e.g. 9600
>
> >>Yes, all correct there..
>
>
> 2. Is the radio data rate set correctly to 1200bps - DIP switches 6, 7, 8.
>
> >>Yes all correct there..
>
>
> 3. Is the HF/VHF switch in the out position for VHF
>
> >>Yes set to VHF
>
>
>
> Going a little deeper, I'd check the audio into the TNC from the radio 
> to see how close the two tones are to being the same level. The Exar 
> decoder chip in the MFJ1270B is particularly intolerant of the high 
> tone (2200Hz) being lower in level than the low tone (1200Hz) and will 
> refuse to decode if the levels are too different. The TNCs need about 
> 200mV p2p for reliable decoding.
>
>
>
> Have you used a terminal program to try to talk to the TNC. You 
> should, at very least, see the TNC message when the TNC is powered up. 
> This can confirm comport speed, etc. I don't know what the latest 
> terminal program is for Windows (I use Linux) but hunt around. If you 
> can talk to the TNC with the terminal program you are well placed to 
> conduct various tests as suggested by Gordon vk4vp.
>
> >>Yes, used PuttyTel and connected and I can communicate to the TNC.
>
>
>
> I have 8 MFJ1270B TNCs (all bought second hand) that have seen service 
> at HF, VHF and UHF and I must say I've never had a reason to doubt the 
> tone frequencies on any of them, but ........
>
> >>Hmm, used to work perfect, but has been packed away...
>
> Thanks for your help
>
> Phil ZEY
>
>
>
> Ray vk2tv
>
>
> On 30/12/2012 3:09 PM, Phil Kern wrote:
>
>     Hi Guys,
>
>     Recently dusted off an old MJF-1270b which I used to use with
>     'packet' many years ago.
>
>     Now trying to configure this with UI-View32. I'm unsure about the
>     config within the Comms Setup Area.
>
>     It appears to be connected on the default setting. Just can't
>      seem to decode anything on the terminal screen.
>
>     Have followed the Config Guides on aprs.net.au Aprs via Internet
>     seems to decode correctly.
>
>     Any help or pointing me in the right direction, would be greatly
>     appreciated.
>
>     Cheers
>
>     Phil
>
>     VK5-ZEY
>
>
>
>
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