[TenTec] Argosy 2

[Ken Brown]

"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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