Kenwood TH-25A Instruction Manual
144/430/440/1200mhz
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Also See for TH-25A:
- Service manual (73 pages) ,
- Instruction manual (24 pages) ,
- Instruction manual (83 pages)
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Summary of Contents for Kenwood TH-25A
- Page 13 KENWOOD TH-25AT Radio Modification EXPANDED RF ~~~~~~~~~~~~~~~ 1- Disconnect the power and antenna. 2- Remove the volume, squelch and tuning control knobs 3- Remove the nuts from the volume control and tuning controls. 4- Remove screw located by the PTT switch.
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Page 14: Clearing All Memory
The source of this information is unknown and not personally verified. It is illegal to transmit outside the ham bands with this equipment. KENWOOD TH-25/45 out of banad modifications Here are some mods for the TH-25AT and the TH-45AT. Please note that I do not encourage transmitting on a frequency for which you do not have a license, nor do I encourage transmitting on a non-amateur frequency without FCC type accepted equipment (in the United States). - Page 15 The schematic for the TH-25AT shows: R18-R21 R26,27 TH-25A M,M2 TH-25A M3,M4,X TH-25AT TH-25AT M,M2 TH-25E TH-25E And the schematic for the TH-45AT shows: R19-R21 R26,27 TH-45A M1,M2,X TH-45A M3,M4 TH-45AT TH-45AT M1,M2 TH-45AT M3,M4 TH-45E TH-45E where O means USED, and X means NOT USED.
- Page 16 The radio will only tune from 215-230 MHz. Note that the PLL would not lock up! (What did you expect? ) Could it be possible that Kenwood originally planned a 220 version of this radio, but then scrapped their plans?
- Page 17 Some users of the TH-25AT/45AT have expressed a desire to defeat the automatic power off function. The following modification will explain how to do this. It should be noted that this modification does not effect the battery saver function. Required Part: Diode Kenwood Part #1SS133 Disconnect the battery pack and antenna. Page 5...
- Page 18 Remove the Volume, Squelch, and Tuning Control knobs by pulling them straight up from the top panel. Using a 7mm spanner wrench, remove the nut from the volume control and the nut from the tuning control. Remove one screw located by the PTT switch. (Figure 1). Remove one screw located by the speaker jack.
- Page 19 This is an optional change that is not covered under warranty. Time required for this modification is 1 hour or less. SYSOP NOTES: Later versions of the TH-25/45AT came with a programmable defeat for the Auto power off function. Do not install this modification if your manual provides a procedure for turning the power off function off! Step 11 tells you to carefully unfold the flexible pc board.
- Page 20 On the TH-26AT this is just a bare jumper wire, TH-45AT ???, TH75A it is a green wire labeled W1. Removing or lifting D4 on the TH-75A extends TX from 136-174Mhz and 335-512Mhz. On the TH-26/TH-46 models this would be 136-174Mhz and 335-512Mhz respectively. TH-25/45 W/TSU-6 Tone alert improvements When using the TH-25/45 in combination with the TSU-6 you may experience erratic operation of the tone alert function.
- Page 21 This modification may be covered under warranty. Time required for this modification is ½ hour or less. Page 9...