From cbfsb!att!pacbell.com!ucsd!news-mail-gateway Fri Jul 19 16:50:58 EDT 1991 Article: 5465 of rec.radio.amateur.misc Path: cbfsb!att!pacbell.com!ucsd!news-mail-gateway From: fletcher@lode.uwyo.EDU (Walter Reid Fletcher) Newsgroups: rec.radio.amateur.misc Subject: FT 470 extended receive modifications. Message-ID: <9107190456.AA23318@ucsd.edu> Date: 19 Jul 91 04:53:00 GMT Sender: daemon@ucsd.Edu Organization: UCSD Usenet Gateway Lines: 178 In INFO-HAMS digest #519, Brent Mosbrook, KC6MWK writes: >Apparently Yaesu has done one better on the mod to receive extended UHF. >Some of the radios cannot scan up, but there is now a fix to change the >lower and upper limits... ...Does anyone have this in ASCII??? I am sure >it would be of interest to the legions of 470 users!! I took the original post from Brian Murrey - KB9BVN and played around, coming up with the following (as I'm sure others have, too). There are probably a number of reasons why this may not work for all units. My 470 was one of the first received at the place I purchased it and is a very early model. What follows is about 170 lines long. Sorry... Reid, WB7CJO - - - - - - - - - - - Synopsis: This procedure appears to force a non-standard frequency into a VFO, which is then stored as an Upper Limit in the "U" memory where the operator can modify it as desired using the MT function. A similar procedure follows for setting a lower UHF limit and capturing it in the "L" memory, plus a similar method for the VHF band. To use the mods after you have stored them, you must select the "U" or "L" memory channel (which ever is closer to your target frequency). Then select the memory tune function by pressing the (MR) key to get the "MT" indication below the memory number display. Once the correct frequency is obtained, you can program it in any memory. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - For these steps to work properly, I had to have "Beep" enabled and *NOT* have the "L" and "U" memories locked out. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Steps for setting the UPPER UHF limit to 500 Mhz 1. Program the frequency for 430.00 mhz *SIMPLEX*. 2. Press the (FM), then the (RPT) button for the offset. 3. Enter the code 0000 into the keypad. 4. Shut the transceiver off, then turn it back on. 5. Press the (RPT) key twice for a "+" (plus) offset indication. 6. Press the (REV) button once. 7. The radio should now display 1430.00 mhz. 8. Press (FM) then hold the (Down Arrow) key to lower the displayed frequency. Stop when 500.00 Mhz is displayed. 9. Press (RPT) once to select simplex operation. 10. Press (FM) and hold until you hear two beeps. 11. Rotate the (DIAL) knob until the channel "U" is displayed. 12. Press the (FM) key again, you should hear a beep. 13. Press the (FM) and (RPT) keys and enter 0500. 14. Turn the radio off, then on again. - alternative procedure (faster but a little more complicated) 8. Press (RPT) twice to select the "-" repeater offset. 9. Press (REV) twice. Frequency shown should be 630.00 Mhz. 10. Press (FM) then hold the (Down Arrow) key to lower the displayed frequency. Stop at 500.00 Mhz. 11. Press (RPT) twice to select simplex operation. 12. Press (FM) and hold until you hear two beeps. 13. Rotate the (DIAL) knob until the channel "U" is displayed. 14. Press the (FM) key again, you should hear a beep. 15. Press the (FM) and (RPT) keys and enter 0500. 16. Turn the radio off, then on again. ------------------------------------------------------------------------------- Steps for setting the LOWER UHF limit to 400 Mhz. 1. Program the frequency for 450.00 mhz *SIMPLEX*. 2. Press the (FM), then the (RPT) button for the offset. 3. Enter the code 0000 into the keypad. 4. Shut the transceiver off, then turn it back on. 5. Press the (RPT) key once (for a "-" (minus) indicated offset). 6. Press the (REV) button *THREE* times. 7. The radio should now display 050.00 mhz. 8. Press (FM), then hold the (Up Arrow) key to increase the displayed frequency. Stop at 400 Mhz. 9. Press the (FM) key and hold until you hear two beeps. 10. Rotate the (DIAL) knob until the channel "L" is displayed. 11. Press the (FM) key again, you should hear a beep. 12. Press the (FM) and (RPT) keys and enter 0500. 13. Turn the radio off, then on again. - alternative procedure - note: this short-cut requires you to enter 430.00 Mhz in step 1. 5. Press the (RPT) key twice for a "+" (plus) indicated repeater offset. 6. Press the (REV) button once. 7. Press (RPT) twice to select the "-" (minus) repeater offset. 8. Press (REV) once. You should have 1030.00 Mhz displayed. 9. Press (FM) and hold the (Down Arror) stopping at 999.00 Mhz. 10. Press (REV) once. You should have 399.00 Mhz displayed. 11. Press (FM), then hold the (Up Arrow) key to increase the displayed frequency. Stop at 400 Mhz. 12. Press (RPT) twice to select simplex operation. 13. Press the (FM) key and hold until you hear two beeps. 14. Rotate the (DIAL) knob until the channel "L" is displayed. 15. Press the (FM) key again, you should hear a beep. 16. Press the (FM) and (RPT) keys and enter 0500. 17. Turn the radio off, then on again. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Steps for setting the UPPER VHF limit to 200 Mhz. 1. Program the frequency for 140.00 mhz *SIMPLEX*. 2. Press the (FM), then the (RPT) button for the offset. 3. Enter the code 0000 into the keypad. 4. Shut the transceiver off, then turn it back on. 5. Press the (RPT) key twice (for a "+" (plus) indicated offset). 6. Press the (REV) button *ONE* time. 7. The radio should now display 1140.00 mhz. 8. Press (FM), then hold the (Down Arrow) key to decrease the displayed frequency. Stop at 800 Mhz. 9. Press (RPT) twice to select the "-" (minus) repeater offset. 10. Press (REV) once. You should have 200.000 Mhz displayed. 11. Press (RPT) twice to select simplex. 12. Press the (FM) key and hold until you hear two beeps. 13. Rotate the (DIAL) knob until the channel "U" is displayed. 14. Press the (FM) key again, you should hear a beep. 15. Press the (FM) and (RPT) keys and enter 0060 (600 Khz repeater offset). 16. Turn the radio off, then on again. ------------------------------------------------------------------------------- Steps for setting the LOWER VHF limit to 100 Mhz. 1. Program the frequency for 140.00 mhz *SIMPLEX*. 2. Press the (FM), then the (RPT) button for the offset. 3. Enter the code 0000 into the keypad. 4. Shut the transceiver off, then turn it back on. 5. Press the (RPT) key twice (for a "+" (plus) indicated offset). 6. Press the (REV) button *ONE* time. 7. The radio should now display 1140.00 mhz. 8. Press (FM), then hold the (Down Arrow) key to decrease the displayed frequency. Stop at 1100 Mhz. 9. Press (RPT) twice to select the "-" (minus) repeater offset. 10. Press (REV) twice. You should have 100.000 Mhz displayed. 11. Press (RPT) twice to select simplex. 12. Press the (FM) key and hold until you hear two beeps. 13. Rotate the (DIAL) knob until the channel "L" is displayed. 14. Press the (FM) key again, you should hear a beep. 15. Press the (FM) and (RPT) keys and enter 0060 (600 Khz repeater offset). 16. Turn the radio off, then on again. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Notes: To use the higher frequencies you have to select the "U" channel and press the (MR) button. This puts the handheld in the "MT" (memory tune) mode. From there you can scan down or use the (DIAL) knob to go to a lower frequency. ...Likewise for the lower frequency memory. Any frequency selected using this method can be stored in any memory. My radio will not let me go up in frequency, only down. If I try, the rig will default back to the original ham band. I had to be careful when doing these mods. One trick I found when initially setting up the VFO with the expanded upper and lower frequencies is that in steps 5 (and 9) if you select "+", pressing (REV) adds 1000 Mhz to the display or subtracts 1000 Mhz if it has already been added. If you selected the "-" (minus) repeater offset, pressing (REV) will subtract 400 Mhz if the displayed frequency is 1000 Mhz or higher, or subtract 600 Mhz if the displayed frequency is below 1000 Mhz, until any more subtractions would run the frequency negative, after which it alternatively adds or subtracts 600. You can mix the (Up Arror) (Down Arrow) method with the "+ -" offset/(REV) combination to reduce the time getting to the desired frequency. With these tricks, many permutations can be found to get where you want to be very quickly. -------------------------------------------------------------------------------