[hpsdr] Ozy freezes on 6m

[David McQuate]

Thanks, Phil,  Yes, I think you're on the right track--a clock "problem".
But actually, I think it results from power supply problem.  My 5v supply is
right on the edge of its capability, but, on 6m the current draw is a 
higher,
and the 5v supply sags.  I suspect that Ozy's 3.3v regulator, U14 drops 
out, at least momentarily,
and the FX2 loses a bit and crashes.

(Higher current power supply is in the works.)

Actually not thermal underwear, but 3 pair of sweat pants.  I dream of a 
radiant heat floor.
Maybe you could send me some of your excess heat, and I could send you 
some coolness!

I'll soon be assembling my pennywhistle, and then I could do some screen 
shots showing the
measurement of IMD as pennywhistle bias is adjusted.

I've also been looking into FM, to see what needs to be added to 
implement Tx.  Don Graham, VK6HK,
inquired about 50kHz BW FM on Dec 19.  A wide FM mode might be added for 
use when the hpsdr was
used with vhf / uhf transverters.

73,
Dave
wa8ywq

Phil Harman wrote:
> Hi Dave,
>
>> My shack is at 12 C.
>
> I sure hope you are wearing thermal underwear!
>
>> When the hardware is cold, when I hit "Tune" on 6m, (with Mute Rx on
>> PTT  unchecked)
>> the receiver audio tone slides up in pitch noticably in the first 1/2
>> second every time Tune is
>> activated.
>
> Since  the Rx tone varies and D9 is no longer flashing I suspect that 
> the 24MHz crystal on Ozy has stopped.
>
> When the board is cold try holding a soldering iron on the case of the 
> crystal for a few seconds to see if it will stop.
>
> 73's Phil...VK6APH
>
>
>
> ----- Original Message ----- From: "David McQuate" <mcquate at sonic.net>
> To: <hpsdr at openhpsdr.org>
> Sent: Sunday, December 27, 2009 2:09 PM
> Subject: [hpsdr] Ozy freezes on 6m
>
>
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>> Using KK 1.06 SVN 193, which I modified to add two-tone test,
>> Ozy freezes when I hit "Tune" while on the 6m band--and not on any other
>> band.
>> Any frequency in 6m band (I've set 53.0MHz), LSB
>>
>> ---But, it only happens after the hardware has warmed up.
>> My shack is at 12 C.  The problem doesn't occur until the hardware has
>> been on for a few minutes.
>>
>> When the hardware is cold, when I hit "Tune" on 6m, (with Mute Rx on
>> PTT  unchecked)
>> the receiver audio tone slides up in pitch noticably in the first 1/2
>> second every time Tune is
>> activated.  I don't hear this on any of the lower ham bands.
>>
>> Hardware:
>> FX2  20090524
>> Ozy  1.7
>> Mercury  2.9
>> Penelope  1.2
>> Excalibur present
>>
>> Before the freeze, Ozy LEDs lit are D2, D5-D8, D9 flashing, D12
>> After freezing, Ozy LEDs lit are D2, D3, D6, D12
>>
>> 73,
>> Dave
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>
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