Actually most mobile repeaters are simplex so you can TX and RX on the
same frequency and use your portable with the power of the mobile the
mobile repeater is connected to. All you would need is a simplex single
band (even one channel) HT.
The better ones (such as the Motorola PAC series) will have sampling of
the frequency so you can even use them on repeaters without waiting for
the tails to drop. You can even key up if your mobile is hearing a
distant station, or even if a distant station is getting into the
repeater you are trying to work. It's just like using the mic on the
mobile itself.
What you are describing is a cross-band repeater where the mobile
receives on one band and transmits on another.
BTW, as for coordination, in WPA there is a band segment just for mobile
repeaters. That keeps them off the link frequencies.
Joe M.
w4cng wrote:
>
> Ditto: There are lots of dual band mobiles and at least one dualband
> HT that have repeater capability. These are not true Mobile
> Repeaters. A "Mobile Repeater" is a device (usually custom built)
> that has 1-2 input frequencies plus tone that repeat out to several
> selected repeater input frequencies. You also need a HT rig with
> custom Offset TX frequncies to talk to the Mobile Repeater while
> listening to the output frequency of the Repeater you want to work.
> You also need the ability to have 40-50db Isolation between the input
> and output frequencies of the mobile repeater to make it work. This
> will include some specially tuned cavity filters (small) and at least
> two antennas, one for RX and one for TX. If any of this does not
> ring a bell with what you have seen, worked on, or have in your
> posession, then it may be over your head to do/use other than learn
> and do over a period of years. My mobile repeater is a Lafayette
> Radio HA-146 25 Watt Crystal Mobile rig split into two custom built
> shielded boxes with an interconnecting shielded/filtered cable
> between the two boxes. The RX has 2 input frequencies with PL
> access, and the TX output is 12 crystal controlled repeater input
> frequencies. TX power is 7 watts output. All I have to do is figure
> out which repeater I want to work where I am located with the best
> signal! The antennna in/out are BNC Female connnectors. Power draw
> is 4A TX from 12VDC. RX Filtering is custom built copper cavities (no
> pix or drawings). This is where you put in the time (years) to
> learn, build, and gain the functional knowledge of repeaters in real
> world and all of it's problems. There are no short cuts to move to
> the head of the line in this discipline. You learn, apply, fix and
> pay your dues.
> Good Luck with learning about Repeaters and RF Engineering.
> Steve W4CNG building Ham repeaters since 1970.
>
>
> --- In Repeater-Builder@yahoogroups.com, "Coy Hilton" <[EMAIL PROTECTED]>
> wrote:
> > HI Nick,
> > I'm going to say this as nicely as I can.
> > "Mobile repeaters" are for the most part, completely useless. Most
> > coordinators want to know exactly where you are going to put your
> > repeater before they will Coordinate a Freequency pair. Mobile
> > repeters are at their best as emergency repeaters for remote
> > locations in disasters, or special events.
> >
> > Second, There are now in most places.....medium to large cities,
> Way
> > more repeaters than necessary, and nearly as many as there are
> hams.
> > That means MOST machines that people put large amounts of money and
> > time into NEVER get used.
> >
> > Third, If you have to ask for detailed info on how to obtain parts,
> > put togeather and how a repeater works you are not ready to own a
> > repeater. You should study, read a lot of old posts from this site,
> > and ask local hams in your area about building and owning
> repeaters,
> > before thinking about owning a repeater. There are already too many
> > repeater owners that aren't technical enough to own a repeater and
> > thier machines sound like ...well, crap. If you are serious about
> > owning a decent machine and put the time into it that it deserves,
> > and when you can answer the questions that you asked in your post
> > then GOOD LUCK!
> >
> > 73
> > AC0Y
> >
> >
> >
> > --- In Repeater-Builder@yahoogroups.com, "ncamilli" <[EMAIL PROTECTED]>
> > wrote:
> > > Hi. I am new to building/owning my own repeater. What is needed
> to
> > > complete a mobile repeater? What parts do I need, where can I buy
> > > them, and how much will it run me? Thanks in advance.
> > >
> > > --
> > > Nick
>
>
> Yahoo! Groups Links
>
>
>
>
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