[TenTec] Argosy 2

[ROLAND HOWELL]

Hi SteveBeen taking some voltage measurements on IF/AF Board this morning, boy are they weird.Q's 4-6 all show 11+ volts on the collectors when on RX not changing when in TXQ7 has 0 volts on collector in RX, should be 8.5v, in TX is correct at 0 volts, base is fine on both TX/RX, emitter has 11.58 volts on RX, should be 0 and 0 volts on TX.Have ordered Q,s 5 and 6, fitted Q4.with drive control fully CCW I am still getting 20watts rf out in the tune position, I am assuming that is normal as it enables the op to tune radio to antenna.Forgive all the questions please mate, I am only an ex rock ape ( RAF Regiment) trying to improve my knowledge.regards73Snowy 

    On Friday, 31 August 2018, 18:55, Steve Hunt <steve at 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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