TS830

here is an easy filter modification for the kenwood ts-830s. first to use 
this mod, your rig need the yk-88c and to mak  t even better, the yg-455c 
installed. in short what we are going to do, is move around a 9 volt 
switching voltage. this voltage comes from the af board, connector no. 7, 
pin no. 5. its marked rlr on the schematic. this voltage ends up at 
the pll assembly, connector no. 8, pin novp2. please do try this 
modification by cutting in this circuit at he source, because this 
same switching voltage feeds the if shiqo circuit, and the vbt circuit, 
and the pll. so cutting the wire at the af board will make the pll 
unlock when the mode switch is anywhere but in the cw positions. now 
to te prtceires.
1. remove the top and bottom covers, and turn the radio upside down with 
front facing you.

w2. locate the mode switch, and on the middle wafer set of contacts, 
cut the white wire with the blue stripe. it is located next to 
1the terminal with no conn ction, on the middle wafer set of contacts9)3-;3 
about 1/4 inch ox wire on t switch contact, so youcan make a connection 
there later.

3. you will need a another switch, one with at least three terminals, 
with the center teminal always in contact with one or the other of the 
outside contacts. its best to use a toggle type so you can mount it in 
one of the spare holes on the back of the radio.

4. splice into the wire removed from the moeoppcich, and connect 
this wire to the center of your new switch.
o5. from one (you select) of the side terminals of the new switch, 
connect a wire and run it back to the mode switch. connect this 
wire to t  tminalon the mode switchnrom which you removed the white 
wire with the blue stripe. you did leave that 1/4 inch of wire didn't 
you? take care here, the grey wire next to the one you are working on 
carries 110 volts, so don't make any solder shorts!

6. now from the remaining terminal of your new switch, connect and run 
a wire to the if board to pins cw1-cw4. connect this wire to the green 
wire, that is connected to one of these pins. you will then have two wires 
connected to one of these terminals.

7. make sure tu have no solder shorts or bridges, make sure you have 
taped or insulated any bare wire connections. mount new switch in one of 
the spare holes on the baccof the radio. install the top aod bottom covers.


the modification works great, one position on the new switch and 
everything isnormal, in the other position the cw filter is placed in-line 
regardless of the position of the mode switch. to use the cw filters 
on rtty/amtor i found i had to turn the if shift control ccw to about 
the 9:30 position to center the tones in the passband. if you need an 
even narrower passband, just tighten it up a little with the vbt. 
good luck and good print!!!


from kf4nj - john..........RELAYED   BY...N0KGX...GENE