Modifications for the Kenwood TS-530
QRO Modification to TS-830S, TS-530S
SUBSCRIBER'S COMMENTS ON QRO MODIFICATION TO TS-830S, TS-530S AND TS-530SP
I would like to pass on the problem I hace encountered in
connection with the QRO modification to the Kenwood radios
TS830S, TS-530S and the TS-530SP.
The problem occurs after many hours of long winded QSO's. It
seems that with the increase in the screen voltage from 210
to 300 volts, R37 on the RF unit (#X44-1360-00) heats up
tremendously and will change it's value so greatly that even
the receive either suffers or goes out totally. R37
originally is Metalfilm resistor at 3.3K ohms and is 1/2
I have changed mine to a Metalfilm as original same value but
have used a one watt resistor. The brand I was abble to get
was RCA and I suppose there are better on the market. This
is a 2% tolerance. Three units that I know of have had this
problem that I took care of in this area alone. Two units
were TS-830S and one a TS-530SP. Just thought I would pass
that information along for what it is worth. (Thanks, Frank
J. Lukas, Jr., 5301 Main Ave., North Ridgeville, OH 44039)
TS-530S Low Voltage Supply Optional Improvements
Power supply drift and stability may be improved by these optional
component changes and additions.
On the AF AVR unit X49-1150-00 (Vicinity of Q19,Q20) change:
R68 from 1K to 1.5K (RD14CB2E152J)*
R72 from 470 to 390 (RD14CB2E391J)*
D14 from WZ-061 to XZ-053 (V11-4101-60)*
*This will improve temperature drift from a maximum of about 100mV to a
maximum of 1mV, and may be applied to any unit before serial # 201xxxx.
Add two 22 k ohm 1/4 resistors (RD14CB2E223J0, one each across Q19, and
Q20, collector to emitter.#
#This will improve overall stability and may be applied to any unit before
Note: These changes are at the owners option and may not be performed in-
TS-530S IF Unit Q2, Q7 Protection
High voltage transients at the receiver antenna can be felt in the ALC
circuitry and cause a failure of IF unit transistors Q2 and Q7. Symptoms
encountered bay be a loss of RX sensitivity, and or loss of S-Meter
Add the surge suppressor to the AF unit (X49-1150-XX) between terminal FG
and ground, to prevent a reoccurance of this symptom.
Surge Suppressor ERZD03DK331
Time required for this modification is 1/2 hour or less.
TS-530 WARC bands
As supplied, the TS-530 will receive but not transmit on the
three new warc bands. If transmit capability is desired,
a minor wiring change is required.. There are just two minor changes that
could be made and they are as fellows .......
For all 3 bands break the line between the rf unit X44-1360-01 connector #6, pin #1 (top
terminal) and AF unit X49-1150-00, connector #7, pin #4 (top terminal).
Or, for individual bands on the rf unit X44-1360-01:
10 MHZ D4
18 MHZ D5
24.5 MHZ D6
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