19-07-1998 YAESU FT-2700 straping
YAESU FT-2700
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D09 D10 D11 D12
0 0 0 0 NO WORK
0 0 0 1 AS SHIPPED
0 0 1 0 -151.600
0 0 1 1 144-154 MHZ 12/25
0 1 0 0 -151.600
0 1 0 1 144-148 MHZ 12/25
0 1 1 0 144-154 MHZ 5/10
0 1 1 1 144-146 MHZ 10/20
1 0 0 0 -151-
1 0 0 1 144-146 MHZ 12/25
1 0 1 0 144-146 MHZ 5/10
1 0 1 1 144-146 MHZ 10/20
1 1 0 0 -151.600
1 1 0 1 140.150 12/25
1 1 1 0 144-148 MHZ 5/10
1 1 1 1 144-154 MHZ 10/20
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- UHF SETTING -
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D13 D14 D15
0 0 0 NO WORK
0 0 1 430-440 MHZ 12/25
0 1 0 430-450 MHZ 12/25
0 1 1 430-440 MHZ 5/10
1 0 0 *NORMAL* AS SHIPPED
1 0 1 430-440 MHZ 12/25
1 1 0 430-440 MHZ 12/25
1 1 1 430-450 MHZ 5/10
19-07-1998 FT-2700RH cross band repeater modification
I have been asked a couple of times to send the mod I devised to use
this rig in cross-band repeater mode. I've always been a bit reluctant
cuz it is not a "cut this trace" or "remove this jumper" type of mod.
It is not for the faint at heart HI. It works quite well indeed,
though. So here it goes.
Making the modification:
Use care, and take your time. This is not an easy one!
Encapsulate both modules in isolating material - I used electric
tape. Make good connections. Before you apply power to test the
mod, ensure the "dim" button is released. Turn the radio on.
Test it to see it works just as before. Nothing should have
changed except for the "dim" button.
Using the mod:
Say you want to cross-link 146.52 simplex to a UHF repeater on 442.00+.
1.Program memory channel #1:146.52 rx, 447.00 tx, full duplex
(consult your manual if necessary on how to do that).
2.Program memory channel #2:442.00 rx, 146.52 tx, full duplex.
3.Lock out all other memory channels so they will not scan.
4.Select either memory #1 or #2 - doesn't matter.
5.Push "dim" button in. This button has become the RPT ON/OFF switch.
Testing:
You should see the 2700 scanning between channels #1 and #2 at a rate
of about 3 cps. Open the squelch and you should see the tx coming on
the air. Close the squelch and scanning should resume. Note that the
rx volume control has no effect on audio level going out on the air.
Now the pot VR1 will need to be adjusted. There are 3 ways of doing that:
1.Use reports from other stations
2.Better than that, use the old VU METER trick.
3.Best, use a deviation monitor.
MODULE "A" &
NOTE #3 & [X]
-----------+ Q1 & VHF UNIT
VHF UNIT +--C---------------->J04 (SEE NOTE #1)
J04 <------R1---------B-& PIN #3
PIN #6 & +<-E-+
R2 &
& &
+--&--------------------+
K1 & K2
CNTL UNIT +-----------------------+
JP01 <--------o---- & -----o---------VR1------ NC
PIN #3 +---+ & +---+ &
& & & C1
+---+ & & & PLL UNIT
GND & & +----------->J03
VHF UNIT & & VHF UNIT PIN #2
J02 <-----------------------& +---------->J02
PIN #7 & PIN #4
- - - - - - - - - - - - - - - -&- - - - - - - - - - - - - - - - - - - - - - - -
MODULE "B" & +---&
NOTE #3 & & &
-----------+ & R3
& +------R4------+
& & +----------&
& & & &
+--+---+---+------+ &
U1 & 8 7 6 5 & &
SEE NOTE #2 & 1 2 3 4 & &
+--+---+---+------+ &
& +---&----------+
[X] <----------+ & & CNTL UNIT
C2 +-------------&<+------>JP01
& D1 PIN #5
+---+
GND
Note #1:
Cut orange wire coming out from plug.
Solder two wires to orange wire coming from CNTL unit, one each to
points marked [X] on the diagram above.
Solder orange wire from plug, pin 3, to ground for dim display light,
or leave unconnected for bright display light.
Note #2:
Pins #4 and #5 of U1 are No Connection
Note #3:
Both modules are built separately, and encapsulated to prevent shorts
Module "A" is located on top of PA module on VHF board
Module "B" is tucked behind CNTL panel in front of radio.
Components:
R1:2.2K C1:0.1 UFD K1 & K2:reed relays,
R2:3.2K C2:10 UFD 12V
R3:47K VR1:35K pot RS #275-233
R4:15K D1:1N914 diode U1:NE555
Q1:2N3638A or equivalent
