PK232.3
From: K4ON @ WB4GHL
Subject: PK-232 Modification…
The following might interest you (copied from K5FL MSO on RTTY):
The following information was received from Wolf, ZS6AQC, concerning new
Eproms for the PK-232 PAKRATT, plus a modification to eliminate noise from
the op-amps. On recommendation of OM Piet, ZS6AQC I checked the noise in
the power bus to the MC34074P op-amps and found (just like he said) that
there is a lot of rubbish between the pins 4 and 11 of U23, 26, 28,30, 32
and 34. So, I placed some 1 microFarad caps across them and my receive
noise is much less (measured on a mark=space scope cross display). In fact,
I can now even copy some steady signals that don't even raise the S-meter
needle. Hope you can improve yours also? This was received from OD5NG: he
made this mod and resulsts were outstanding.
CONTINUED IN FILE PK232.18
GW1NGL NA7KR Kevin Roberts Ham Radio
Page last updated on 09/10/2012 by Kevin Roberts NA7KR a colection of Ham Radio and Electronic Information
From: K4ON @ WB4GHL
Subject: PK-232 Modification…
The following might interest you (copied from K5FL MSO on RTTY):
The following information was received from Wolf, ZS6AQC, concerning new
Eproms for the PK-232 PAKRATT, plus a modification to eliminate noise from
the op-amps. On recommendation of OM Piet, ZS6AQC I checked the noise in
the power bus to the MC34074P op-amps and found (just like he said) that
there is a lot of rubbish between the pins 4 and 11 of U23, 26, 28,30, 32
and 34. So, I placed some 1 microFarad caps across them and my receive
noise is much less (measured on a mark=space scope cross display). In fact,
I can now even copy some steady signals that don't even raise the S-meter
needle. Hope you can improve yours also? This was received from OD5NG: he
made this mod and resulsts were outstanding.
CONTINUED IN FILE PK232.18
GW1NGL NA7KR Kevin Roberts Ham Radio
Page last updated on 09/10/2012 by Kevin Roberts NA7KR a colection of Ham Radio and Electronic Information