49 mhz to 6 meter conversion

49 mhz to 6 meter conversion

Post by David Laws » Sat, 24 Feb 1996 04:00:00

I have recently read an article in the Boston Amateur radio club archives
about converting a 1 channel 49 mhz radio shack walkie talkie to a 6 meter
tranciever with a 1 repeater coverage. Does anyone know why this shouldnt
work with a simple crystal change? Has anyone done it? It might become my
next project.

David Lawson
KF4EBP

 
 
 

49 mhz to 6 meter conversion

Post by Mark A. Garre » Sat, 24 Feb 1996 04:00:00



Quote:>I have recently read an article in the Boston Amateur radio club archives
>about converting a 1 channel 49 mhz radio shack walkie talkie to a 6 meter
>tranciever with a 1 repeater coverage. Does anyone know why this shouldnt
>work with a simple crystal change? Has anyone done it? It might become my
>next project.

>David Lawson
>KF4EBP

I have done it.  It is really quite simple to change over the 1 channel
units that are crystal controlled.  If you order crystals order wire leads
so that you can lay over the transmitter cystal over on the board (if you
use the hc18 style and mount it vertical you will not get the case closed)
Tuneup is straighforward.  You might want to add a small pot to the fixed
resistor squelch circuit to loosen up the squelch and come up with another
type of antenna (at 50mw you still have only a 1/4 mile range tops with
the antennas on these units.  A decent antenna or beam can really help out
on range).>

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49 mhz to 6 meter conversion

Post by Jeff Duntema » Sat, 24 Feb 1996 04:00:00


>I have recently read an article in the Boston Amateur radio club archives
>about converting a 1 channel 49 mhz radio shack walkie talkie to a 6 meter
>tranciever with a 1 repeater coverage. Does anyone know why this shouldnt
>work with a simple crystal change? Has anyone done it? It might become my
>next project.

The only place you might trip up is not having enough "travel" on any
of the little can coils to bring resonance up by the 2-3 Mhz it might
take.  Some of the cheapies use "***" wire coils that you can spread
out to reduce inductance, but it's not an exact science and make take
some futzing.

You might give it a shot and let us know how you do.

--73--

--Jeff Duntemann KG7JF
  Scottsdale, Arizona