Scott,
I have been down that road twice, coincidentally with exactly the same
Sinclair part number. In each case, I had a working isolator pulled
from Government service around 166 MHz that I wanted to use in the
Amateur 2m band.
The "range" shown in the catalog for these isolators is really an
indicator of the manufacturer's capability to make the isolator, not the
tuning range of a particular unit. Once an isolator or circulator is
made for a particular frequency, it can only be tuned a very few MHz
either side of that frequency.
It will cost about $250 to remanufacture your isolator to the new
frequency, which involves a considerable amount of precision work. This
is much cheaper than buying a new isolator, and it comes with a
guarantee. Be forewarned: Once you open the isolator, Sinclair may
refuse to perform the rework.
73, Eric Lemmon WB6FLY
wn1b8 wrote:
> Greetings,
>
> I have a Sinclair model I2113A isolator. The range on this is
> supposed to be roughly 130 to 170 MHz. It currently sits at 167.1
> MHz. I want to put it on 148.8. I suspect that this requires
> retuning of the large magnets. I have removed to side stickers to
> reveal the outside of the magnet holders, but they appear to be
> locked with something like Lok-Tite. Has anyone experience in
> retuning these? How do I go about freeing the covers? Will a heat
> gun be adequate without damaging the inside components?
>
> Kevin's site has the instructions for field tuning these but that
> only covers the fine tuning within a 2-4 MHz. range. I need info on
> the coarse tuning.
>
> Thanks,
>
> Scott Madison, WN1B
>
>
> Yahoo! Groups Links
>
>
>
>
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/Repeater-Builder/
<*> To unsubscribe from this group, send an email to:
[EMAIL PROTECTED]
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/
