Re: [TenTec] Argosy 2

[Martin Sole <hs0zed@gmail.com>]

Hi Snowy,

Whenever I've had similar problems, and it does happen time to time here 
though different rigs, never seen an Argosy, it's often a result of a 
nearby surge event, lightning strike. Look at T1 and T6 to see if they 
are particularly fine wire. In all the cases I've seen similar deafness 
it has been either switching diodes that are open circuit or a fine wire 
transformer with an open circuit winding. Even with the sig gen as far 
back as C11/D4 I would think -80 to -90 should produce a fair signal.
Martin, HS0ZED


On 01/09/2018 01:41, ROLAND HOWELL via TenTec wrote:
> Hi SteveOk injected signal into con 32, no difference to sensitivityAs for why 
> r25 burnt out I can't answer that but it was definitely cooked.I have spoken to 
> the ex owner of the radio and he states that he was using it thru' a tuner when 
> it went wrong and he smelled smoke, the burnt components!That was why I changed 
> the sensing diodes in case they had been damaged.Snowy G0HZE
>
>      On Friday, 31 August 2018, 18:55, Steve Hunt <steve@karinya.net> wrote:
>   
>
>   How sensitive is it if you inject a signal directly after the BPF at
> connector 32 on the RF mixer board? That would eliminate a lot of the
> front-end diode switching.
>
> PS - not sure why R25would burn out - it doesn't carry any DC current
> according to the schematic.
>
> Steve G3TXQ
>
> On 31/08/2018 17:20, ROLAND HOWELL via TenTec wrote:
> > Hi SteveThanks for replying my shout for guidance on the ARGOSY 2 525d problem that I 
> > have.Yes it is the same on all bands.Now on removing the top cover to look at the innards 
> > I saw on the mixer board I had 3 x burnt components 2 x 8.2ohm and 1 x 150ohm 
> > resistors ( R,s 24-26),these changed as well as the associated small 'C,s, again no 
> > difference ,I have followed the path back from the 'S' meter and replaced Q2 and Q11 
> > on the if/audio board, no difference.Went back to the low pass filter ( the odd numbered 
> > one 91696 not what is in the manual) and changed the BAT41 diodes in the sensing circuit, 
> > you guessed it, no difference.HELP hi hiI have noticed that it seems to be off frequency, 
> > I inject a signal of 7.050mHz but seem to get a better tone at 7.045mHz and a small bit 
> > of life in the 'S' meter but it still requires a massive input signal in to show any 
> > life, the TX indication is spot on.Regards73Snowy
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