Hi Jim,
I really don't want to argue with you, but it can
be done and I've done it numerous times. It all
comes down to a number game (the specs) and a
reasonable approach.
I've used surplus Decibel mobile duplexer's in
narrow split operation for years. If properly set
up and secured, they should not detune.
Portable two meter repeaters can work pretty well, if
you approach the project with reasonable expectations.
Many/most of the common "flat-pack" VHF duplexers are
designed for wide splits. Some combinations of the
small & mid size Harris, Decibel, Sinclair and
Phelps-Dodge packages can be set up or modified to
operate narrow splits. The preformance will not be
spectacular, but the repeater will work ok.
cheers,
skipp
skipp025 at yahoo.com
www.radiowrench.com/sonic
> "Jim B." <[EMAIL PROTECTED]> wrote:
> [EMAIL PROTECTED] wrote:
> > Does anyone know if there is even a mobile duplexer
> > made for the 2 meter HAM split? Make? Price? This
> > is for a portable GR 300 repeater.
> > Thank you.
> > Rod KC7VQR
>
> No. Can't be done. To get the isolation you need for
> the 600Khz split on the 2M ham band, the cavities must
> be much larger, too large to be called 'mobile'. Plus
> the tuning adjustment will be touchy enough that the
> bouncing around will de-tune it.
> Portable repeaters for the 2M ham band don't work
> well. Getting rid of the desense takes some doing.
> It's not imposssible, but it ain't easy.
> Jim Barbour
> WD8CHL
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