Thanks Mike and James
Will look into that tomorrow, I have during the day taken all the
voltages as shown on page 3-20 on the SSB module and whilst most are as
indicated there are some anomalies, for instance Q4 RX collector shows
3.911v should be 4.9v, TX shows 0.035v should be 4.7v, base RX should be
0.05v shows 0.004v TX should be 0.05v shows 0.774v, Emitter RX should be
0v, shows 0v.
U1, RX pin 1 shows <2.5v should be 5.18v, Tx pin 1 shows 0.3v should be
4.93
pin 2 shows 0v correct, TX shows 0.27v should be 2.79v
pin 3 as it should be 0v
pin 4 shows 0v, correct, TX shows 0v should be 2.04v
pin 5 shows 5.2v should be 5.18v, TX shows 5.2v should be
4.93v
pin 6 shows 7.52 should be 7.54v, TX shows 7.2v should be
7.14v
pin 7 shows 7v should be 0v,TX shows 0.580v should be
8.29v
pin 8 shows 7.52v should be 7.54, TX shows 7.52v should be
7.14v
I hope that IC CA3053 is not faulty as they are few and far between,
those that are available are mega expensive.
I do hope I haven't bored the pants of you gents but getting a little
frustrated at my lack of knowledge of this radio, I have 2 more to look
at after this one, oh dear, I will be hairless at the end of it. hi hi.
stay well and healthy
73
Snowy G0HZE
------ Original Message ------
From: "Mike Bryce" <prosolar@sssnet.com>
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Cc: "ROLAND HOWELL" <snowy.howell@btinternet.com>
Sent: Thursday, 11 Jun, 20 At 15:31
Subject: Re: [TenTec] Argosy 2
I’d sure take a peek at the balanced modulator. It appears that carrier
is getting though. I don’t recall if they used didoes or a IC.
Mike, WB8VGE
www.theheathkitshop.com
On Jun 11, 2020, at 4:27 AM, ROLAND HOWELL via TenTec
<tentec@contesting.com> wrote:
Hi all
Thanks to Martin and Dave for the advice so far.
One thing is puzzling me with the radio and that is this, When I switch
to SSB (upper or lower) the radio transmits what ever power level has
been set with the drive control, I have always thought that it only
transmitted with audio is applied via the mic, or have I got it wrong!.
I am wondering if I have additional problems.
The voltage levels on the 4558 appear to be correct, I have changed it
anyway but the voltage on U1 pin 1 is only <3v not what is written, all
other pin voltages are correct.
So more head scratching today ( I must be careful of getting splinters
ha ha).
stay well and happy
73
Snowy G0HZE
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