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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