[Microwave] Lenkurt 71F2

Mon, 24 Feb 2003 21:16:21 +1300

Agreed- almost certainly -48 or -24 volts DC. Try -24 (Briefly!!) and see
what the regulators deliver-if it's low try -48!
The rx front end will definitely need a good low noise preamp added for
1691(put it out at the dish feed and use decent coax from there into the
main rx/down converter) and bear in mind the IF will probably be several MHz
wide at 70 MHz. Best bet maybe to just use it as a down-converter. Re- tune
the LO chain and swing the mixer IF output up to 137 MHz so as to use an
existing sat rx in the first instance. In that case of course the 70 MHz IF
chain is a toss-out.
  A friend did something similar with an old OKI link rx some years
back-worked FB with a good preamp and a 1.5 metre dish- without the preamp -
no go.

 73 Dave, ZL3FJ

----- Original Message -----
From: <[email protected]>
To: <[email protected]>
Cc: <[email protected]>
Sent: Monday, February 24, 2003 5:07 PM
Subject: Re: [Microwave] Lenkurt 71F2

> Typical microwave gear was made to operate at -48V DC (pos gnd)
> since they were designed to interface to telephony ckts (PBX, etc).
> though SOME used a 24V DC power supply....
> I MAY know of some docs on that....I'll check and see..
>
> Chris
> WB5ITT
>
> Gilles Masson wrote:
> >
> > Hi. would anyone on the list have any info on the
> > Lenkurt 71F2? It`s a repeater, rx 1769.5 mhz, tx
> > 1878 mhz. Made circa 1974. I`d like to use the rx
> > for GOES on 1691 mhz.
> > I don`t know the dc voltage going in. The
> > regulators are set at 20 volts output to all
> > circuits.
> > It might have been used on Troposcatter in the
> > Arctic.
> > Thanks, and 73, de Gilles, VE2AMN
> >
> > _______________________________________________
> > Microwave mailing list
> > [email protected]
> > http://mailman.qth.net/mailman/listinfo/microwave
> _______________________________________________
> Microwave mailing list
> [email protected]
> http://mailman.qth.net/mailman/listinfo/microwave
>