Thanks for your reply,
I found the fault. I open the transceiver and verify voltage level on
U9 from DSP Board.
It seems to be CW_KEY_T bad signal level '0' instead level '1'.
I measured 1,35 v on input buffer. Datasheet shows a VIL max of +1,8v
typical.
I unplugged DSP board and verify diode, resistor. I think U9 is bad
or solder under pin.
I must unsolder U9 and I will post news about repair.
73's
Herve F8EHJ
Le 8 août 10 à 17:24, Rick W a écrit :
Herve you may have already tired this BUT the first thing I would
do is disconnect ALL cables to the rig except the power supply.
That includes, mic, CW key and any cables on the rear. Turn on the
rig and see if it still goes into transmit.
I do not have a ten-Tec Jupiter but If it still goes into transmit
it looks like the rig may be getting a "T" voltage from a source
and it may be a component failure in the transmit chain.
Good luck.
73,
Rick
VE7TK
Website: http://www.ve7tk.com
To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Subject: [TenTec] Jupiter 538 always on transmit
From: F8EHJ <f8ehj@free.fr>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Sun, 8 Aug 2010 16:41:05 +0200
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
Hello,
After a long time without radio operating (about 6 months), I wished
to turn on my tansceiver Jupiter 538.
When I powered on, the TT jupiter is always transmiting on Ham radio
Band.
I test all modes, bands, it is like the PTT or CW key are pushed.
I performed a master reset (A CONTROL KEY PUSHED and POWER SWITCH
TURNED ON) and downloaded lastest firmware version (1.32) without
success.
I tested with schematic help the input signals CW KEY (from jack on
front panel) and PTT (from ACC1). They are no short circuited.
Did anyone have this problem ?
Best 73's
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