19-07-1998 YAESU FT-2700 straping YAESU FT-2700 -------------------------------------------------------------------- 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 ------------------------------------------------------------------- - UHF SETTING - ------------------------------------------------------------------- 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 @ 1050 ohms R3: 47K VR1: 35K pot RS #275-233 R4: 15K D1: 1N914 diode U1: NE555 Q1: 2N3638A or equivalent