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- copied from packet:
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- Msg# TSF Size #Rd Date Time From MsgID To
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- 33018 BF 5506 0 13-Jan 1158 F1LOU 30537_ON7RC YAESU@WW ()
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- Sb: FT23/73/211 mods
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- MODS FOR FT23, 73 and 211:
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- **************************
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- 9600 BPS with Yaesu FT-211RH
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- ----------------------------
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- RX AUDIO:
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- ---------
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- On the RX "IF UNIT" (sub board F2869104) connect the screened lead inner to
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- the TK10420 IC pin 9 with the outerscreen to pin 15. Caution should be taken to
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- solder these if soldered to the underside of the board.
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- TX AUDIO:
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- ---------
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- On the rear of the "MAIN UNIT", a small potentiometer will be seen (peak devia-
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- -tion adjust.). Unsolder the leg nearest to the rear of the set, and connect
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- the inner of the screened TX leads to this point, the outer to the earth plane
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- adjacent to this point. To ensure that the 9600 bauds modem is terminated in
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- the required impedance, it is essential that a suitable terminating resistor be
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- placed across the screened lead inner/outer (a 560 ohm resistor); this may
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- usefully be done at the FT-211RH potentiometer connection.
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- No further adjustments need to be made to the radio. On the tested modem a
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- suitable level of 2.5 kHz deviation was achieved with one third rotation clock-
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- -wise of the modem TX AF level potentiometer.
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- YAESU FT-23R case disassembly:
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- ------------------------------
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- 1) Remove the black screws from the top panel of the radio.
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- 2) Remove the knobs.
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- 3) Remove the black screws from the rear panel of the radio.
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- 4) Remove the battery.
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- 5) Remove the 6 screws on the bottom of the radio, where the battery attaches.
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- 6) CAREFULLY remove the front panel of the radio.
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- 7) In the left of the microprocessor and battery are several printed circuit
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- jumpers. The jumpers labeled 7, 8 and 9 are for the frequencie mods, like
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- explained in the following.
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- 8) Re-assemble the radio in the reverse order of these steps.
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- 9) The Microprocessor will loose all what the memory contains.
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- YAESU FT211/23/73 band mods:
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- ----------------------------
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- The uP's in the FT-23/73 and the FT-211 can be set for many frequency and
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- memory mode combinations. These modes are controled by the jumpers (solder
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- pads) marked 7,8 and 9 on the "CONTROL UNIT" board of either radio. Here is a
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- list of what is possible:
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- JUMPER FREQUENCIES
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- 7 8 9 COVERED
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- open open in 140 to 164 MHZ
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- open in in 140 to 160 MHZ
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- in open in 144 to 148 MHZ
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- in in in 144 to 146 MHZ
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- open open open 220 to 550 MHZ
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- open in open 440 to 450 MHZ
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- in open in 50 to 300 MHZ
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- in in open 430 to 440 MHZ
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- The FT-211 has separate VCO's for transmit and receive and will lock over about
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- 38 MHZ from approx. 130 to 180 MHZ. The FT-23 has only one VCO and the overlap-
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- -ping lock range (Xmt & Rcv) is about 25 MHZ from approx. 135 to 175 MHZ. Don't
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- forget, if you adjust the VCO you must realign every electronically tuned stage
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- in the front-end of the radio. The transmitters can be tuned for somewhat
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- higher power output above 164 MHz but at a great power loss at 2m.
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- The non-amateur (commercial) memory mode will cause these functions changes:
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- 1.When in the MR mode, the channel number will be displayed instead of fre-
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- -quency. You can toggle back to the original "amateur" mode display by pres-
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- -sing F<up-arrow>. Pressing F<down arrow> bring you back to commercial mode.
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- However, when switching from D to MR, the display will always revert to the
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- commercial mode.
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- 2.The function of the Dot<Pri> button will be exactly reversed. That means now
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- you can press just one button (Dot) to get into or out of the Primary function
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- The Pri funtion (in memory mode) will be indicated by a large "P" on the left
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- side of the display.
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- 3.The only indication of low power operation is in the memory mode. A "C" will
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- appear in the upper left corner of the display (where the primary "P" used to
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- be). The bargraph will always read 100%.
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- 4.The band scan is now even more useless. The uP will painfully count from 50
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- to 300 MHz.
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- FT23/73 in packet-radio:
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- ------------------------
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- If you want to work in packet-radio, open jumper 10 to dissable the battery
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- save.
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- 73's de Phil, F1LOU @ ON7RC.BT.BEL.EU
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- ======================================================================
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- Note: I haven't tried or verified this, proceed at your own risk. And
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- DO NOT transmit outside of legal bands! WA2ISE
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- .
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