[DSP-10] Need Assistance on DSP-10 Transceiver

[Chuck E Swedblom]

Hi Mike,

Thanks for the quick reply, I will try out some of your suggestions and
let
you know how they work out.  I answered your questions at the end of each
paragraph.

73,  Chuck

On Fri, 25 Jul 2003 22:35:37 -0700 kd7ts <kd7ts@ispwest.com> writes:
> Hi Chuck,
> 
> It seems there is serial comm between the DSP-10
> and the computer since there is an error
> indicated. The screen clock should be updating and
> the waterfall will also scroll up if all is well.

ANS:
These functions are working fine and never fail to load.

> 
> You didn't say if there was a frequency from the
> 126 MHz oscillator or if it is held at one end of
> it's range. From the voltages you supplied, it
> appears to be driven to one extreme.

ANS:
The frequency of the 126 oscillator is at 121MHz when
the error voltage from the PLL is at zero Volts.
Therefore, the frequency is being forced low.  I 
have run thru the frequency range from low to hi
with no results.  I have not tried going outside of 
the band.  With zero error voltage, my operating 
frequency would be 141.68MHz.  I sure do not
want to be there.  I live just across the fence from
the Navy and having retired from them as a micro-
wave design engineer for 30 years I know that they
use several frequencies in that area!!

> 
> You might try tuning the frequency below 144 and
> above 148 and see if it will lock. There is
> nothing in SOFTWARE, that I am aware of, which
> limits the lock range.  Maybe the oscillator will
> lock outside the expected frequency range.

I sure hope not!!

> 
> Are you using the ADSP EZ-KIT lite ??

No, I am using the TAPR kit.

> 
> The +10T should be low and the +10R high when in
> receive, even if the PLL is not locked. If neither
> is present, we need to find out why.

The +10T and +10R voltages have never been present.
At first I thought that the 74HC595 was bad and 
replaced it without results. Then  I assumed that if one 
of the PLL's  dropped out, the program would inhibit the
transmitter and receiver from operating, atleast I sure
hope that it would!
 
> Have you tried EZLD.COM ?? How about using the
> options with EZFAST ?? It can use the options of
> M, L or blank to set loading speed. This can be a
> problem when running from slow floppy drives. 

I am having no problems with loading the operating
programs since I use my hard drive.
> 
> Have you run any of the PLL diagnostic programs ??

No, I am not aware of them.
> 
> Mike KD7TS
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