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Modifications for the Yaesu FT-90
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Yeasu FT-90 TX 130-180,
410-480 MHz. |
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I just figured out the mod for the Yaesu FT-90. It will give you
TX 130-180 MHz / 410-480 MHz.
- Remove 4 screws from bottom of radio.
- Remove R2156 (connected to pin# 21 on
Q2021, the CPU HD6473337YTF16)
- Replace cover and screws.
- Perform a Master Reset (hold down DISP/SS,
<| |>) and turn on power.
That's it!
Perform this Mod at your own risk.
This modification works both for the US
and the european version. So the use same R for mod, but different
firmware.
Update 05-04-2001:
Unless you are good at working with SMD's, do not remove R2156.
Instead, cut a small, about 1-2 mm, piece out of the circuit trace
that goes from R2156 to the CPU. By cutting the trace right next
to R2156, you can always place a solder bridge back in the trace
to make it "normal".
The value of R2156 is zero Ohms. It
provides ground to pin 21 of the CPU.
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FT-90
Microphone PTT Lock Mod |
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Microphone MH-36, to use the
"Lock" switch to lock the PTT as well as the top buttons.
Inside microphone,
- Cut circuit trace between solder
jumpers 3 and 4.
- Solder jumpers 1, 3, and 4.
- Place wire jumper from solder pad
below jumper 4 to jumper 1.
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| Connect other
microphone to Yaesu FT-100 & FT-90 |
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Author: Björn
Karlsson
This modification is originally made
for FT-100 but should also work for FT-90.
Here´s a description on how connect
UP/DOWN and PTT to Yaesu FT-100.
Here below does I a description how
components shall connect to radio.
6-pins modular jack
Mic-jack Yaesu FT-100 / 90 / 8100.
Pin 1: SW 2 multi-function
switching
Pin 2: N.C. (9600bps packet data output FT-90)
Pin 3: + 9 v
Pin 4: GND
Pin 5: Microphone Input
Pin 6: SW 1 PTT, UP och DOWN
73 Bjorn SM5SWI
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User comment |
Subject:
More info |
From:
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I was interested to see Björn Karlsson's
information on how to "Connect other microphone to Yaesu
FT-100", as I have been looking for some time for a way of
using PTT, rather than VOX, with another microphone.
My curiosity pushed me to try the
same circuit on SW2 and it works. It gives you the P, P1 and
P2 buttons. However, there was still the ACC button missing,
so I put a variable resistor from SW1 to ground and found a
fourth position.
The circuit below gives you PTT, UP,
DOWN, ACC, P, P1, and P. At least, it works on my rig. Don't
forget that you can programme the functions of P, P1 and P2 on
the FT-100.
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Author: -
Serial Numbers
For all Yaesu/Vertex radios that
I've seen, the serial numbers are in the format of
YPXXXXXX where "Y" is the production year, "P" is the
production run and "XXXXXX" is the radio's unique number.
Slow CTCSS De-response
The FT-90R (along with the
FT-2600M) uses the MX-Com MX165C CTCSS Encode/Decode IC.
The way that Yaesu incorporates it into the 90, makes the
receiver mute several hundred mS late. Even though the
FT-2600M uses the same chip, the de-response time on it is
much more desirable. I figure that replacing the following
FT-90R components with the same values that are used in
the 2600M will give better performance: R2132-2.2MΩ,
R2135-330kΩ, C2100-0.1uF. If anyone has a chance to test
out these values in the FT-90R configuration, please let
me know your results. I will try this out as soon as I
have a chance.
Squelch Problems
The FT-90R has an infamous
squelch problem that makes the receiver squelch and
un-squelch at a very high rate while receiving a signal.
This seems to be caused by extreme temperatures, high or
low. Yaesu will do a squelch alignment for the price of
$30 plus shipping. If you have access to a service
monitor, you can align the squelch yourself with the aid
of a $20 service manual.
Radio Alignment
Connect the radio to a 13.8VDC
regulated power source for use on all steps. Signal levels
in dB are based on 0dBµ=0.5µV. It is suggested that you
refer to the "FT-90R Technical Supplement" provided by
Vertex Standard. I am not responsible for any damage you
may cause your radio.
Internal Alignment
To access your Alignment Menu,
you must build a plug that plugs into the microphone jack
of the radio. Wire it so pins 1,4, and 6 are shorted
together. Insert the plug while turning the radio on. Upon
entering the Alignment Menu, take the plug out. The
following is what you will find in the Alignment Menu of
your FT-90. The numeric values may be different, however.
For Receiver adjustments, use the RF signal generator set
for 1kHz tone at ±3.5kHz deviation. Use the arrow buttons
on the front panel to switch between each alignment item.
To save levels when the RF Sig Gen is used, press the DIAL
or the microphone's [VFO/MR] button. To adjust manual
settings, rotate the DIAL. To change bands while in the
Alignment Menu, press [SET] on the front panel. Press [DISP
SS] on the front panel to save settings and exit (once
alignment is complete).
Item Ad144/Ad433 Description Adjust/Level Method
DC V 203 203 VDC From The A/D? No Info No Adjust
FLPO 255 255 Always 255? No Info No Adjust
HIPO 222 210 High Power Adjust 50/35W Out Manual
MID1 122 142 Mid1 Power Adjust 20W Out Manual
MID2 69 88 Mid2 Power Adjust 10W Out Manual
LOW 36 49 Low Power Adjust 5W Out Manual
MOD 177 177 Modulation Adjust ±4.0kHz Dev. Manual
TUNE 0 0 Receiver Tune? No Info Manual
CTR- 185 152 ? No Info Sig Gen
CTR+ 154 184 ? No Info Sig Gen
SQ-S 59 61 Sql Threshold -11dBµ RF In Sig Gen
SQ-T 21 22 Sql Tight -2dBµ RF In Sig Gen
S-1 86 99 S-1 Adjust -2dBµ RF In Sig Gen
S-F 155 171 S-Full Adjust +25dBµ RF In Sig Gen
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| Fast squelch
mod for FT-90r |
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Author:
Jochen Heilemann, DG2IAQ -
FT-90 fast
squelch optimization,
a must for mobile usage".
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User comment |
Subject: RE: FT 90 SQ MOD |
From:
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I received this user comment:
----------------------------------
IF THAT CAP. (C2007) MAKES THINGS WORSE; WHY WOULD
THEY HAVE INSTALLED IT IN
THE FIRST PLACE ???
Hello.
I really can't tell you. The rig works ok with this
cap but not on all mobile cases for me. The original
squelch delay isn't acceptable for me. It works much,
much better without that cap.
In my tests today, as I was mobile and had a QSO to a
weak stations, about S1 - S3 maximum, the rig works
very, very fine without any problems. I received all
transmissions from them. As the signal grow a little
stronger I closed the squelch knob totally, up to
maximum. The reception works fine again !
So maybe the cap would produce a higher *AVERAGE*
squelch behaviour. That might be ok, when you're using
the FT-90 at home and you want or must filter out
weak, noisy signals with a permanent signal value.
(background QSO's). With this original cap the totally
closed squelch would mute more, I expect.
But on mobile usage you can't filter out weak signals
cause of the permanently changing signal levels, the
fading effect. It has a opposite effect ! The slow
squelch behaviour mutes too much of the fading
receiving signals. The reception is interupted
permanently but you normally don't recognize this. You
think, the signal *IS* so bad, but it isn't !!
If you don't like the mod, you can re-solder that cap
or you can use a new one (SMD or tantalum type).
73,
Jochen, DG2IAQ
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FT-90 programming
software |
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FT-90 programming software. Trail version.
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KB2LJJ