[UK-CONTEST] Deaf 756 pro III

[Jiri Culak]

Marios,


Sorry to hear re-756Pro not hearing.
Do you have signal generator handy? Or if you have 2nd radio running,
you can try putting carrier out on some QRG into dummy load or for very
short period to antenna with good match and check if you can hear it
with nothing or piece of screwdriver connected to 756.
You should hear something. If nothing is visible on scope/ audible when
you TX then it could be front end or mixer. Also there is possibility of
last IF being weird-stuck. Perform full reset as last IF is  I believe
digital and it converts 455 to 40kHz or something like that. 
Scope and signal decoding is done over there. Try turn roofing filter
off too.

73 en GL!

Jiri

-----Original Message-----
From: uk-contest-bounces at contesting.com
[mailto:uk-contest-bounces at contesting.com] On Behalf Of Marios Nicolaou
Sent: 09 December 2008 12:59
To: uk-contest at contesting.com
Subject: [UK-CONTEST] Deaf 756 pro III

Hi Clive

thanks for the reply!

The radio was working OK beforehand and the display was very
active.The display/scope is now flat. I  tried ANT1/2 selection and
there were no signals. I plugged the antenna directly still same
problem. I havent tried using a receiving antenna to see if this makes
a difference (antenna relay should be bypassed this way). I will do so
this weekend!

Thanks for your input

73s

Marios
G0WWW
5B4WN










Well not on either of mine there isn\'t!

Frying sounds unlikely. More likely in my experience is selecting the
wrong antenna- topmost button to the left of the screen. This is easily
done in the heat of the battle and doesn\'t leap off the display at you.
Can be checked visually in no time. I hope I\'m right.

More seriously keying of a legacy amplifier such as the SB220, without
an intermediate relay or solid state switch,  will fry the PRO3 antenna
c/o relay. This is verrry poor design I have to say.


73


Clive
GW3NJW


--
Marios
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