[TenTec] Argosy 2

[ROLAND HOWELL]

Yes you got it Ken, low output from the drivers on my pig tail setup on 
those bands, milliwatts as compared to a massive 1.5watts on driver 
collectors.

------ Original Message ------
From: "Ken Brown" <kenradiobrown at gmail.com>
To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
Sent: Tuesday, 6 Oct, 20 At 23:35
Subject: Re: [TenTec] Argosy 2
"I have also noticed that there is very little output on a number of
bands,(10m, 17m, and a couple of others, possible fault on the 
filter?)."
You mean TX RF output from the drivers? And the output from the finals 
is
low on all bands?
On Tue, Oct 6, 2020 at 10:24 AM ROLAND HOWELL via TenTec <
tentec at contesting.com> wrote:

Hi Ken
As per Mikes advice i have checked the voltages to the final's ( 0.7v)
all ok, not certain of the function of Q5 and U1.
Have replaced all of the driver's, final's and U1.
Have checked the output on my scope, nice and healthy input and output
from the drivers, it gets lost from then on.
I have also noticed that there is very little output on a number of
bands,(10m, 17m, and a couple of others, possible fault on the filter?).
I purchased a scruffy but working radio to take voltage comparisons as i
have 6.1volts on the t/rx connector #8 on the rf mixer board whilst in
receive, disconnect the tx power to #8, rx audio comes up a few dBs,
Both Mike and i think that the radio has been zapped, yet the rx is
great.
hope i haven't bored you
73
Snowy
------ Original Message ------
From: "Ken Brown" <kenradiobrown at gmail.com>
To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
Sent: Tuesday, 6 Oct, 20 At 20:40
Subject: Re: [TenTec] Argosy 2
Since I don't have a schematic for that radio to look at I'm not sure
where
T3 is. Input to final transistors or output? Even so, direct comparison
on
a wattmeter may be misleading. The impedance is different in various
places
in the PA circuit, only the input and output to the whole PA board can
be
assumed to be 50 Ohms. How about measuring voltage at those various
points
using either a HF AC Voltmeter (the kind with the detector diode right
inside the probe) or an Oscilloscope with 10X probe?
DE N6KB
On Tue, Oct 6, 2020 at 9:21 AM ROLAND HOWELL via TenTec <
tentec at contesting.com> wrote:
Hi All
Update on the above radio, i attached a co-ax pigtail to the collectors
of the drive trannies, got 1.5 - 2 watts out at that point, then fitted
the pig tail to the base's of the power trannies, got just milliwatts
out, so then attached the pig tail's to output leads of the T3, got just
0.5watts out of that transformer.
So do those transformers go faulty?
Any/all advice appreciated
Thanks
Snowy G0HZE
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