Tk 208 how put 8 diodes 1n4148 insaid for tk 208 end work in vhf band 144 mhz.

Based on the information you provided, it seems like the Kenwood TK-2000 radios you have may have been programmed with the wrong band split. The TK-2000 is available in both VHF and UHF frequency ranges, and it's possible that the radios you have are actually UHF models, despite being listed as VHF frequencies when you read the radios.
To check if your radios are UHF or VHF, look for a label on the back of the radio that specifies the frequency range. If it says UHF, then the radios can only accept frequencies in the 400-440 MHz range. If it says VHF, then the radios should be able to accept frequencies in the VHF frequency range.
If you've confirmed that the radios are indeed VHF models, then it's possible that the band split settings may need to be adjusted in the programming software to match the specific VHF frequencies you're trying to program. I recommend checking the manual for your programming software to ensure that you have selected the correct band split settings before programming the radios. If you're still having issues, it may be helpful to contact Kenwood customer support for further assistance.

GENERAL Performance Specifications R&TTE Directive 1999/5/EC Band VHF (V1): 136-162 MHz VHF (V2): 146-174 MHz UHF (U1): 400-430 MHz UHF (U2): 440-470 MHz Number of Channels 16 Channel Spacing 12.5kHz, 20kHz, 25kHz (Programmable per channel)

factory reset: Push and hold AI + FUNC and turn the scanner on.
The message INITIAL are shown in the display..
Now it's reset to the factory settings,
with 124 MHz stored i memory channel 1 in the Air band,
and with 156 MHz stored i memory channel 1 in the "VHF band".

The reference would not prevent you from receiving. It is more likely that the pin diodes in the antenna TX/RX switch are defective or the RX front end amplifier is shot. Check the diodes with an ohm meter. If you get a short across one, check with the leads reversed. if you still get a short, then the diode is most likely shot. Make sure you have the schematic to follow. You can get it at www.mods.dk.

This is an Amateur (Ham) Radio 2-meter Transceiver. It will only transmit on the 2-meter Amateur band (144-148 MHz) but has expanded receiver coverage from 136-174 MHz which includes Public Service and Commercial 2-Way Radio bands. Please note that an Amateur License is required to operate on the 2-meter Amateur Band.

The manual isn't online to my knowledge however I did find a guide on how to program it.
"Turn it on. Push the "MANUAL" button to stop it from scanning.

Push number 1, then push "MANUAL" again. This should leave you on
channel one.

Using the keypad enter the frequency you want to monitor, then push
"E." Press "REVIEW" at anytime to see what frequency is programmed
there. If the review button flashes 000.0000 on the LED readout
display, you might be entering an invalid frequency. Refer to the list
of acceptable frequencies in the Frequency Range Bands below.

Push "MANUAL" to step to channel number two. Enter the frequency. Push
"E." Push "MANUAL" to step to channel three. Repeat this process until
all the (10) channels are full, or you've run out of frequencies to
enter.

Push "SCAN" to start automatically scanning the frequencies. The
radio will stop when it hears someone talking, and resume scanning two
seconds after the conversation has stopped.

Frequency Range Bands:

20 to 29.7 MHz (10 Meter "Ham" Band)
29.7 to 50 MHz (VHF Low Band)
50 to 54 MHz (6 Meter Amateur Band)
136 to 144 MHz (Military Land Mobile)
144 to 148 MHz (2 Meter "Ham" Band)
406 to 420 MHz (Federal Government Land Mobile)
420 to 450 MHz (70cm "Ham" Band)
450 to 470 MHz (UHF Standard Band)
470 to 512 MHz (UHF "T" Band)"

http://newsgroups.derkeiler.com/Archive/Rec/rec.radio.scanner/2006-01/msg00174.html
Hope this helps.

Your scanner does not receive frequencies between 54 and 137 MHz, and there's nothing you can do to enable reception in that block. Your only option is to purchase a scanner with air band coverage. Here are the reception ranges of the BC-60XLT-1:

29.0-29.7 MHz 10 Meter Amateur Band
29.7-50 MHz VHF Low Band
50-54 MHz 6 Meter Amateur Band
137-144 MHz Military Land Mobile
144-148 MHz 2 Meter Amateur Band
148-174 MHz VHF High Band
Above bands in 5 kHz steps
406-420 MHz Federal Government
420-450 MHz 70 cm Amateur Band
450-470 MHz UHF Standard Band
470-512 MHz UHF "T" Band
Above bands in 12.5 kHz steps

Need the manual for your scanner? You can download and print it, at no cost, here:
http://www.uniden.com/pdf/BC60XLT-1om.pdf

Bill B.
Listening in since the 60's

Its so easy to use you really don't need a manual for the Uniden BC
142XL scanner.

Turn it on. Push the MANUAL button to stop it from scanning.

Push number 1, then push MANUAL again. This should leave you on
channel one.

Using the keypad enter the frequency you want to monitor, then push
E. Press REVIEW at anytime to see what frequency is programmed
there. If the review button flashes 000.0000 on the display, you might be entering an invalid frequency. Refer to the frequency coverage list below.

Push MANUAL to step to channel number two. Enter the frequency. Push E. Push MANUAL to step to channel three. Repeat this process until all ten channels are programmed, or you've run out of frequencies to enter.

Push "SCAN" to start automatically scanning the frequencies. The
radio will stop when it hears someone talking, and resume scanning two
seconds after the conversation has stopped.

Frequency Coverage:

20 to 29.7 MHz (10 Meter "Ham" Band)
29.7 to 50 MHz (VHF Low Band)
50 to 54 MHz (6 Meter Amateur Band)
136 to 144 MHz (Military Land Mobile)
144 to 148 MHz (2 Meter "Ham" Band)
406 to 420 MHz (Federal Government Land Mobile)
420 to 450 MHz (70cm "Ham" Band)
450 to 470 MHz (UHF Standard Band)
470 to 512 MHz (UHF "T" Band)

For a comprehensive database of active frequencies in your area, visit

www.RadioReference.com
.

Its so easy to use you really don't need a manual for the Uniden BC142XL scanner.

Turn it on. Push the "MANUAL" button to stop it from scanning.

Push number 1, then push "MANUAL" again. This should leave you on channel one.

Using the keypad enter the frequency you want to monitor, then push "E." Press "REVIEW" at anytime to see what frequency is programmed there. If the review button flashes 000.0000 on the LED readout display, you might be entering an invalid frequency. Refer to the list of acceptable frequencies in the Frequency Range Bands below.

Push "MANUAL" to step to channel number two. Enter the frequency. Push "E." Push "MANUAL" to step to channel three. Repeat this process until all the (10) channels are full, or you've run out of frequencies to enter.

Push "SCAN" to start automatically scanning the frequencies. The
radio will stop when it hears someone talking, and resume scanning two seconds after the conversation has stopped.

Frequency Range Bands:

20 to 29.7 MHz (10 Meter "Ham" Band)
29.7 to 50 MHz (VHF Low Band)
50 to 54 MHz (6 Meter Amateur Band)
136 to 144 MHz (Military Land Mobile)
144 to 148 MHz (2 Meter "Ham" Band)
406 to 420 MHz (Federal Government Land Mobile)
420 to 450 MHz (70cm "Ham" Band)
450 to 470 MHz (UHF Standard Band)
470 to 512 MHz (UHF "T" Band

If this helps, please take a moment to give us a rating -- and a rating of "very helpful" would be greatly appreciated.

Hi,

A Kenwood TM-271A is an amateur radio and therefore restricted to transmit only from 144 - 148 MHz but can receive from 136 to 174.

The TX restriction is done with a resistor (R119) which inhibits transmission outside of the 144-148 band. It is located very near a large IC (IC252).

Depending on your country's radio communications policies and/or your radio license privileges, simply removing R119 would allow transmission outside of the 144-148 MHz.

Hope this be of some help/idea. Post back should yuo need additional information.

Good luck and kind regards.