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- From: wa2ise@cbnewsb.cb.att.com (robert.f.casey)
- Newsgroups: rec.radio.amateur.misc
- Subject: FT23, 33, 73 extended range mods
- Keywords: mods
- Message-ID: <1991Dec1.030953.26190@cbfsb.att.com>
- Date: 1 Dec 91 03:09:53 GMT
- Sender: news@cbfsb.att.com
- Organization: AT&T Bell Laboratories
- Lines: 123
-
-
- copied from packet:
- w2fwd.ny.usa.noam
- allbbs
- Subject: Yaesu FT-23,33,73 Mods Revised
-
- ---------------------------------------------------------------------
- WARNING: Out-of-band operation is unlawful.
- This electronic document is for informational purposes only.
- Try this at your own risk.
- ---------------------------------------------------------------------
-
- >From the Bench of: KB2Jpd
- ======================================================================
- Extended Frequency Enhancements for the Yaesu FT-23R(2M), FT-33R(220),
- and FT-73R(70cm). (Revised)
- ======================================================================
-
- Greetings and hello radio amateur operators.
-
- The topic is increasing the functional frequency coverage
- of what has been probably Yaesu's most popular handheld tranceivers.
-
- To save manufacturing costs, Yaesu engineers designed multiple
- personalities in the same CPU module found in the FT-23R, FT-33R,UHF FT-73R
- and the FT-2008/7008 tranceiver. The FT-2008/7008 tranceiver is the commercial
- version of the Ft-x3R series.
-
- Unique features of this mod include
-
- -the just say Mao feature (**)
- (NO FREQUENCY READOUT: Ch 1 thru Ch 9 appear on your display.
- Great when you aren't looking and some fellow ham tries to rip
- off your simplex frequency)
-
- -the GREAT WHOPPER
- (opens the CPU to 50-300 Mhz or 220-550 Mhz coverage. Full
- (.100 Mhz to 999.9995 Mhz) adjustable freq coverage available
- so far only on the FT-33R;this doesn't mean you can actually
- transmit but the Activity light goes in TX and you get a good
- fake RF bargraph that indicates that you can transmit on 750 MHz.
- HOW TO DO IT:
-
- 0. Contemplate invalidating your warranty. No beginners beyond this
- point. If you don't know how to solder, don't learn here. Ask
- an elmer to assist.
-
- 1. If you treasure your memories, write out your contents of your radio
- on a piece of paper. When you make the changes, the CPU runs a small
- diagnostic and see that the jumpers have been changed. It will ERASE
- ALL PRIOR SETTINGS.
-
- 2. Dissassemble your tranceiver.
-
- 3. Find the line of solder connections running down the CPU board.
- GENTLY move all wires aside so you won't melt them.
-
- 4. Using solder wick and a Good low-power soldering Iron,
- see chart. Read special notes for the FT-33R.
-
- 5. Rebuild radio and count your blessings.
-
- (**)NO FREQUENCY READOUT
- ------------------------
- Removal of the solder bridge labeled number nine will
- activate the commercial side of the CPU module. To flip to
- the amateur mode, you would press F UP Arrow. To flip to
- the commercial mode, you would press F Down Arrow.
-
- +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=
- +=+=+=+=+=+=+=+=+=+=+= FT-23, FT-73R Chart =+=+=+=+=+=+=+=+=+=+=+=+=
-
- 50 to 300 Mhz spread 220 to 550 Mhz spread
- -------------------- ---------------------
-
- Open bridges 8,9 Open bridges 7,8,9
-
- +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=
- +=+=+=+=+=+=+=+=+=+=+=FT-33R Chart =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=
-
- Same chart as above, but I wanted to add my experience of the Yaesu
- FT-33R 220 Mhz radio.
- When I removed number 7 and then did a cold reset <see below>,
- the CPU cleared and showed me a L and a freq. I put .100 in.
- Press D/MR. Then a U appeared. I turned the VFo knob until 999.999
- appeared. Press D/MR.
-
- I also had to reenter the Repeater Split to the proper value.
-
- On the VFO, I could QSY down to those limits (using F UP/DN) and
- listen to my local Channel 13 on 215.720/.660.
-
- Yes, 216-220 Mhz is available with this mod. Great if 216-220
- is the next 220 subband.
-
- +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=
- -NOTES-NOTES-NOTES-NOTES-NOTES-NOTES-NOTES-NOTES-NOTES-NOTES-NOTES-
- +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=
-
- <1> Cold Reset of the CPU Board.
- With the radio upright and your nose pointing at the CPU board,
- look at the Lower Right Corner of the CPU chip. You will see two
- parallel SMT resistors. Below them is a screw with possibly a paper washer.
- To the right is a SMT device (it's a cap) with a pointed end facing Left.
- Ground that point to the screw or to the case with a flat screwdriver.
- Awhile doing that, cycle on/off the radio to ensure a good reset.
- Remove screwdriver and then reassemble radio.
-
- Dedicated to:
- ----- the knuckleheads in Barry Electronics who said it was impossible.
- ----- Yaesu Tech Support who claimed that there are no RESET circuits
- in their radios, when their schematic diagrams say otherwise.
-
- Special Thanks to:
-
- Ken, N2MUK, for playing the guinea pig.
- Bobbie, KB2IFJ, for playing surgeon when I told him not to.
-
- Please don't play with matches.
- W2Fwd.NY.USA.NA
- ======================================================================
- Note: I haven't tried or verified this, proceed at your own risk. And
- don't transmit out of band! WA2ISE
-
-
-