Re: [Repeater-Builder] Re: DC INJECTOR AND PREAMP

Sun, 04 Jun 2006 01:36:17 -0700

The other thought to this whole problem is running without a Duplexer and using two antennas on the tower with proper separation.  The cost of the Coax might be higher due to running two lengths, but then the cost of a duplexer isn't that cheap either as I have found.  Anyone know what the separation needs to be between two antennas in the 460 area?  Which should I put on top? The Rx with a preamp, or the TX with the output amp?  This is a thought that took me too long to think about.

dan ryant <[EMAIL PROTECTED]> wrote:
the problem with moving the repeater is that there isn't any buildings near the mast, and building one would  pretty much be out of the question due to the cost involved and the slope of the hill that the tower is on.  Not to mention the trees that would have to be cut down and the permits required. 
I am trying to find a DC injector that will power a preamp which can "bypass" for an output amplifier. 
This is my thought. Please correct me if I'm wrong.
From the GM400 I run to the duplexer at 25 watts.  then, from the output of the duplexer to the antenna, I connect a dc injector, then I connect the amplifier for the output power of 150 watts.  On the mast I connect a preamp with RF out bypass and YEE HAA, I have a repeater????  it that right?
Can a dc injector be added before or after an amp?
My uneducated guess on the final output power on a 350' run of coax will be about 18.75 watts out.  A 20 db preamp connected to a 6db gain antenna would be 1.625db at the repeater.  Is that about right?
Again, any help would be appreciated.  Thanks  ps. any manufacture information or models that I should look at would be more than welcome. Price is a factor, but the budget allows for some "reasonable expenses" knowing that the cost of the building being built would cost several hundreds to a thousand or more.
Thanks again
Dan

skipp025 <[EMAIL PROTECTED]> wrote:
Don't know if I'd trust the remote ac power option in
some cases.

The cable would have to be underground and/or well
protected above ground...

Plain Romex would scare me and make an insurance carrier
even more nervous.

cheers,
skipp


> "Steve Bosshard (NU5D)" <[EMAIL PROTECTED]>wrote:
> Why not use outdoor romex cable to extend AC power, and
> move the repeater closer to the antenna - loss would then
> be in the AC power line, and not in the transmission line.
> Assumes you can find a suitable and secure outdoor
> enclosure....
>
> Steve NU5D
>
>
>
> On 5/30/06, skipp025 <[EMAIL PROTECTED]>wrote:
> >
> > The common answer is probably no... you can't run a remote
> > preamp as described in your post. There is always a "but"
> >
> > There is a yes answer, but it takes quite a bit of hardware,
> > which doesn't seem practical except in very special cases. It's
> > a hardware layout of an rf tower mounted rx preamp diplex
> > filtered with tx path signal hardware, but you would really
> > have to know the costs and performance trades for buying and
> > using one.
> >
> > It would be more practical to remote locate the repeater in
> > a small weather proof box closer to the antenna.
> >
> > The best bang for your buck would be to invest in some really
> > good hard line for the long feedline run. 1-5/8 hard line is
> > cheap on the surplus market right now...
> >
> > cheers,
> > skipp
> >
> > > "danryant" wrote:
> > >
> > > I am using a pair of GM300 radios hooked up to a duplexer and
getting
> > > a repeater controller. The problem that I am having is the 250' run
> > > of coax to get from the shack to the antenna.
> > > My question is this. Can a preamp and dc injector be used when the
> > > antenna it is hookup up to is both the tx and the rx antenna? I am
> > > going to be running a amp for tx power as well. (100 watt) My
> > > understanding is that I will be down to about 12.5 watts at the
> > > antenna on the tx side. Is this correct math?
> > > Thanks again for your help and continued support for those of us who
> > > are not radio literate.
> > >
> >
> >
> >
> >
> >
> >
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
> >
>
>
> --
> Ham Radio Spoken Here.....NU5D
>










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