FT470.7 I have recevied enough enquiries about mods for the Yaesu FT-470 hand held, that I have decided to post what I know. (This is a transcription of a letter that I received detailing the CPU programming jumpers that were found experimentally by Ed Boakes, WB3FLD. Keith, N7HMF) ======================================================================- Dear Keith, A little while ago, I came across a Net News item from you about the Yeasu FT-470 handheld. You asked if anyone knew how to make it receive the public service band just above the UHF amateur band. Well, I've figured out how to do that. However, the bad news is that when you strap the unit for this mode, it only transmits from 430 to 440! Oh, well. I gave you a phone call a week or so ago, but it seemed that we kept missing each other. Anyway, here is what I've learned about the FT-470: I have located a total of eight straps, the four which you had written about, to the left of the lithium battery, and four others located under the flat white cable that interconnects the upper half with the lower half. YEASU FT-470 STRAPS =================================================================---- R69 Vertical, at the 10 o'clock position by the lithium cell R68 Horizontal, to the lower left of R69 R67 Horizontal, just below R68 R66 Horizontal, just below R67 R71 Vertical, the leftmost of three, to the left of the upper corner of the ribbon cable connector. R70 Vertical, the center of three of which R71 is the leftmost R72 Vertical, the rightmost of the three R74 Vertical, to the left of the ribbon cable connector, below the three. (Note that R74 is below an unpopulated capacitor that does not have a C number. =================================================================---- There is no R73, or at least it is not on the circuit board and it is not in the schematic. And, yes, the order of those three is indeed R71, R70, R72, left-to-right. R70, R71, R72 select the mode for the UHF portion of the FT-470. The choices are: UHF CHOICES =================================================================---- R71 R70 R72 Rx and TX Receive only =================================================================---- 0 0 0 430 to 440 Mhz 430 to 500 Mhz 0 0 1 430 to 450 Mhz 0 1 0 430 to 440 Mhz 0 1 1 432 to 438 Mhz 1 0 0 430 to 440 Mhz 1 0 1 220 to 225 Mhz 1 1 0 430 to 440 Mhz 1 1 1 210 to 235 Mhz =================================================================---- R66, R67, R68 and R69 select the mode for the VHF portion of the FT-470. The choices are: CONTINUED IN FT470.8