153 lines
6.9 KiB
Plaintext
153 lines
6.9 KiB
Plaintext
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========= MODS for KENWOOD TS-930 Transcievers ==========
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The following is a list of favorite changes that can be made to the
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Kenwood 930. These changes are quite simple and do not require the
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addition of any switches.
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NOTE: In the operator's manual supplied with the 930, there is an error
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on one of the drawings. On the upper left corner of the DIGITAL UNIT
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schematic locate connector 8. The lead designations are as follows (note
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that some of the designations do not appear on this sheet so you can add
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them to the drawing):
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Pin Desig.
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1 100
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2 MU
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3 SCN
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4 M2
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5 MIN
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6 FSK
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7 B2
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8 FT
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On the main drawing, called SCHEMATIC DIAGRAM, the pin numbers shown on
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connector 8 are reversed from the way they are numbered on the DIGITAL
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UNIT schematic. In the following changes, I am assuming that the
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numbering on the DIGITAL UNIT sheet is correct. In any event, it will be
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obvious which end is which since the end pin is vacant.
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CHANGES
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1) The resolution of the main tuning digital readout can be increased
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from 100 Hz to 10 Hz. No digits are lost since the readout has the extra
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digit for this purpose. This change is accomplished by grounding pin 1
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of connector 8 on the DIGITAL UNIT.
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2) The tuning rate is 10 kHz per revolution of the main tuning knob.
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The tuning rate can be changed to 5 kHz per revolution by cutting one
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end of diode D-13 on the DIGITAL UNIT.
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(Note that the black marks on the tuning knob itself are exactly 500 Hz
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apart. The knob can be "corrected" by tuning in an exact frequency, for
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example 10,000.00 kHz, pressing the DIAL LOCK switch, then turning the
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knob to line up a black line. As long as you don't spin the dial too
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fast, it will track nicely from one end to the other. With the slow rate
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modification, the dial increments become 250 Hz per division).
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You may desire to switch this reduced tuning rate on and off. For
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example, you can select the new rate on just VFO B by using an unused
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section of the "FUNCTION" switch. Another possibility is to use the
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display "DIM" switch.
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3) There are an additional 8 memories available. These can be obtained
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by grounding pin 5 of connector 7 on the DIGITAL UNIT. (This lead is
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designated "M3").
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The 8 additional memories can be selected by using an unused contact on
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the "FUNCTION" switch.
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4) Each group of 8 memories can be scanned at a rate of about 1 per
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second. Unlike a normal scanner, The unit will not stop scanning when a
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signal is present, but it is a good way to search favorite frequencies
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for activity.
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A method of turning on the scan function without affecting normal switch
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functions would be to wire the unused section of the DIAL LOCK switch in
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series with the unused section of the METER switch (meter switch in the
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"VC" position).
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5) A handy option is to be able to momentarily unlock one VFO when the
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DIAL LOCK is on. This can be useful during split frequency operation
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when you want to keep the receive vfo locked (the DX station's xmit
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freq), yet quickly qsy to the frequency he is listening to with your
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transmit VFO.
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This change can be made by wiring one lead from the DIAL LOCK switch in
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series with extra normally closed contacts of the "T-F" switch.
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6) This change permits automatic disabling of a linear amplifier during
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full break-in cw operation. This is desirable since the relays in a
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linear cannot properly follow each keyed character element. This change
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should also be done if AMTOR operation is contemplated.
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Assuming that your 930 has the aux. relay board in it, merely wire the
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+28 volt lead to the relay coil in series with the extra contacts of the
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"FULL-SEMI" switch.
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7) For AMTOR operation, the T-R switching speed must be increased.
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2 suggested changes are to remove C-500 (4.7uf) on the SIGNAL BOARD
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(located top center near connector 30), and to ground the junction of
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R-476 / Q-100.
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8) In early units, the WARC band transmit was not enabled. If this is
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the case, solder a jumper from pin 12 of IC-23 to ground on the DIGITAL
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UNIT. (Ground can be obtained at pin 8 of IC-24).
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9) Transmit can be enabled on all frequencies between 1.5 and 30 MHz for
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MARS and transverter use by adding two jumpers on the DIGITAL UNIT:
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Connect pin 9 of IC-11 to pin 12 of IC-21.
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Connect pin 9 of IC-12 to pin 12 of IC-22.
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========================================================================
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Additional comments:
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Even though the receiver low frequency end is spec'd as 150 kHZ, it will
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operate down to 100 kHz. [A[BTo conveniently switch in a general purpose
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receiving antenna you must use the transverter connector. When the 8 pin
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DIN plug is plugged into this connector, a switch operates which
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separates the coaxial antenna input from the receiver input. These two
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connections appear at pins 8 and 5 resp. of the transverter connector.
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(This 8 pin DIN plug is not furnished with the 930). The most
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convenient setup is to bring cables from both the REMOTE and TRANSVERTER
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connectors into a junction box which has appropriate connectors and
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switches on it for interfacing to a transverter, receiving antenna,
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linear amp, etc.
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Here is a chart of the connections to these connectors:
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REMOTE (7 pin DIN) XVERTER (8 pin DIN)
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1 Speaker output 1 Grd
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2 Grd 2 +V out on xmit*
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3 PTT 3 Grd
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4 Q-22 out** 4 XVRT ON/OFF Control***
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5 unused 5 Receiver input
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6 ALC input 6 XVRTR ALC input
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7 XMIT RELAY** 7 Xmit RF to xvrtr input
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8 HF ant in
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* A 12 volt, 50ma max. relay may be connected from pin 2
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to ground. This relay will operate on xmit.
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** Original units used Q-22 collector for linear amp relay
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control. This did not work with low voltage relay systems
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or those using a negative voltage. An optional relay board
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(Now supplied in all units as standard) is available and
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provides a normally open contact closure to ground at
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pin 7.
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*** Pin 4 is grounded to enable xvrtr operation. This may
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be done by a switch in the transverter itself.
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========================================================================
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***->Be careful not to transmit out-of-band, or accidentally operate on
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any non-amateur, unless you are authorized to do so.
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DO NOT JEOPARDIZE YOUR LICENSE!
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[EOF]
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