[DSP-10] Moth balled DSP-10 has some troubles - ADDENDUM

[Don AE5K]

Hello again Mike,

To answer your questions/comments...

TAPR Manual - that looks like the one I followed when building.

Transmit light - yes, normal operation

Sidetone - ***NO!*** - no sidetone heard.  I tried "Scroll S" and it 
does nothing that I can see, HOWEVER, I now get in lower left corner the 
error message when doing the Scr S:
    "E1 DSP Data Lst"
followed by the line "STONE-"

+10 transmit - will check tomorrow anyway

Yes, have listened on another receiver -- sounds fine both CW and SSB. 
(Way back in 2003 I made a 5 mile contact via SSB, but who knows, it may 
have been with 1 mw power!)

KA7EXM power meter - yes, its readings correspond fairly well with diode 
detector. I will try to verify also with a 2-meter FM transceiver 
tomorrow (with 40 db tap).

Did we find something with the sidetone error message???

Also remember, I never did check actual power out when built 10 years 
ago, only real transmit test (other than listening on local receiver) 
was the SSB contact. When I feel more wide awake tomorrow morning, I'll 
start checking the wiring of the ADSP box too. (unless you can spot the 
problem now ;-)

Don AE5K

On 04/11/2013 09:20 PM, kd7ts wrote:
> Hi Don,
>
> depending on which instructions you have, TAPR or W7PUA there is a 
> list of jumper wires on the back of the board, W-1 through W-29 on 
> pages 2 and 3 or page 29. These are labeled in the list. This can be 
> useful to identify transmit +10. These wires all connect to plated 
> through holes and are available on the top of the board.
>
> You can download a copy of the TAPR manual done by Steve Bible here:
>
> http://www.proaxis.com/~boblark/asyman3.pdf
>
> Does the transmit light come on when you toggle the "home" key ? Do 
> you hear a sidetone in the speaker or 'phones when you key with the 
> right "alternate" key while in transmit ?? If the light does not come 
> on, then +10 transmit is missing. If the sidetone is not present, it 
> may indicate a problem with the ADSP2181 wiring. (this doesn't seem 
> likely, but is so easy to check !!)
>
> Can you listen on another receiver while the DSP-10 is transmitting ? 
> This might be useful to see if most of the transmit chain is working. 
> Receive and transmit share quite a bit of the circuits, and at the 144 
> end of things are split by D1. +10T is applied to R4>L6 (wire 16) to 
> switch the diode and also to L17 (wire 17) to power the transmit rf amp.
>
> Your comment on listening to a marker tells me there is a lot of stuff 
> that is correct.
>
> I am unfamiliar with the KA7EXM power meter. Can you verify it reads 
> as expected from another source ?
>
> I never got as much power as I hoped, but was eventually able to get 
> +20 dbm (100 mw).
>
> 73 Mike KD7TS
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