These modifications apply to PK-232s with serial numbers under 1000.
Four simple hardware modifications improve the PK-232's performance.
1. Change C54 from: 0.1 mfd 10% mylar (increase low-frequency rolloff)
to: 0.01 mfd 10% mylar
2. Change U16 from: 74LS04 (do this only if bbRAM does NOT hold memory)
to: 74HC14
3. Change R35 from: 20K 5% (improve VHF/Morse sensitivity)
to: 39K 5%
4. Add: 0.047mfd mylar 10% in series with R79 (same as above)
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
Four simple hardware modifications improve the PK-232's performance.
1. Change C54 from: 0.1 mfd 10% mylar (increase low-frequency rolloff)
to: 0.01 mfd 10% mylar
2. Change U16 from: 74LS04 (do this only if bbRAM does NOT hold memory)
to: 74HC14
3. Change R35 from: 20K 5% (improve VHF/Morse sensitivity)
to: 39K 5%
4. Add: 0.047mfd mylar 10% in series with R79 (same as above)
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