Let me see if I can help with the DB Antenna, which from
the size reads like something for the VHF Range.
We've done the work for you... go to the repeater builder
web page www.repeater-builder.com and look at the Decibel
Antenna drawings that others and myself have provided.
The VHF Antennas from 138-174MHz were made in three or
four models that covered smaller portions (band segements)
within the above listed frequency range. You'll see
something like DB-224A, DB-224B and DB-224C as examples
of them mentioned.
You'd first want to ID what model you have and then figure
out if it would work for your needs. The various models
do go out of band a bit, but I've not found the VHF antennas
to be as usable out of band as the UHF versions seem to be.
The physical size of the dipole is the better indicator of
where the antenna operates (band segment). If the DB Ant
is another 160 MHz model ... I would say it's not going
to be easy to mod and use it for 146MHz (2 meter) operation.
If you look at the DB Antenna drawings we've provided, you'll
notice the physical size of the Dipole Elements change quite
a bit when moving from the 138-150 segment vhf antenna up to
the 150-162 segment (frequecies ranges may not be the exact
values, used for the example only). The coax harness also changes
for the band segments.
I've found it not so easy to get a 150-160MHz and higher
band segement to work well down into the ham band. Since
the dipole elements change size at the 150 MHz "breakpoint"
it's not really easy to (increase the size of...)
resize/mod the Dipoles Elements without major metal work.
You then have to make/copy or buy a replacement coax
harness for the lower band segment once you rework the
Dipole sizes .
Life goes on... hope that helps a bit.
cheers,
skipp
> "n7zef" <[EMAIL PROTECTED]> wrote:
>
> I was recently given 2 antennas, and I need to know if they could be
useful
> for 2 meters or in the scrap yard.
>
> One is a Sinclair 2 bay antenna Model # SRL210C2HD*2. Sticker on it
says
> the frequency os 160.860.
>
> The other is unknown. It is a 4 bay antenna with just the elements and
> phasing harness, no boom. Each element measures 34 in total length
OD, 2.75
> in width OD, 1/2 inch dia tubing. The wording stamped in the phasing
harness
> says D.B. Products.
>
> Like I said, I would like to know if these could be made to work on 2
> meters...
>
> 73
> Mike - N7ZEF
>
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