Hi Wayne,
The original MSR-2000 Receiver Preamp relative to an ARR
(or Angle) GaAS "gas-fet" has less gain and a noticeably
higher noise figure.
I have used both the original and an external preamplifier
on pretty much all versions of the MSR-2000 Receivers.
Depending on your Duplexer, the operation of your system
would normally be "more improved" with an external added
GaAs Preamplifier versus using the original unit.
Better third order performance is one benefit.
I know everyone is in love with Angle Linear Preamps and
they're very good products... but I also use a heck of a
lot of ARR GaAs Preamps because they're a great dollar
value and they work very well.
Regarding the active device inside the box (the transistor
or FET):
Phempt device amplifiers are wonderful, GaAs (gas-fet) are
great, bipolar types have their place in many applications
but what's in front and behind the box (filter-wise) also
matters a great deal.
Want to build your own?
http://www.radiowrench.com/sonic/so02145.html
s.
> "Wayne" <wa5...@...> wrote:
> Hello Joe and every one else.
> In case we can't find the factory version has anyone
> else tried hooking a preamp to the pins where the factory
> version plugs in? That would put some filter ahead of the
> preamp.
> Wayne, WA5LUY
[pasted original post]
I am in need of a HLD4051A or HLD4052A receiver preamp out of a Mitrek or
MSR-2000. This is the plug in preamp that goes in the helical resonator. This
is for vhf 146.xx. If anyone has one or two let me know how much you want.
