Hi All
still having problems with my Argosy 2, 6.8v on the tx connector (8) on
mixer board in RX, have purchased another just to get voltage
comparisons with, i swapped mixer boards and the donor radio appears to
work, it transmits and receives, so i think the board is ok
but??????????. i also have no RF out put, have checked it with my scope,
i have a good output from the RF mixer to the PA drivers, a good out put
from the drivers to the toroid transformer T3, if my memory serves, a
lower output onto the base of the finals, mrf477,s.
That's as far as it goes, all transistors and U1 have been replaced,
electrolytic's as well, not sure if Q5 MJE520 is good, i have purchased
17 more, in 2 batches, new old stock, when i tested the 1st batch of 12,
silver leads, all had gain figures in double digits only, the 2nd batch
purchased, gold leads, once again gain figures were lower in some cases
that the 1st batch, only 1 of the 17 had a gain figure in triple digits.
Am i reading the test results correctly?.
The only thing i haven't changed are the 4 x 4700pf chip caps and the
.1mf chip cap, does anybody know where i can purchase some from and what
size are they, the are approx 1cm square.
Would love to get the radio working as it should but coming close to my
limited knowledge.
As always any and all help is very welcome.
stay well and healthy
Snowy G0HZE
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
|