[TenTec] preselectors

[Geoffrey S. Mendelson]

On 8/6/12 10:04 PM, Michael Tortorella wrote:
> Hi all,
> Following up on a recent thread from Rick DJ0IP, I am moved to ask if anyone
> has any opinions on the Palomar Engineers preselector?  (I am not at home
> right now so can't look for the model number, sorry).  Or how about the old
> RME DB-23?  Or even the Ameco preselectors (PT- series).

I really love the PT-3 I bought in the late 1980s. I bought it because 
my Sony IFC-2010 just did not have the RF gain I wanted. I later bought 
a Kenwood R-5000 and an NRD-535 and while they both had the gain, the 
PT-3 was still appreciated.

I did the second receiver mod, which allows you to have a second 
receiver connected and both mutes it and protects it from RF "leakage" 
from the transmitter.

It claims to have 18db gain, I can't verify or disprove it, but mine 
added at least 10db gain by my various S meters.

The preselector is also good, but I can't measure it or even approximate 
at the moment.

The only problem with it in a TenTec context is that it is time delayed 
QSK not full QSK. I'm sure you can set the delay time to be very short, 
but probably not short enough for QSK, even at slow speeds.

I think they are still sold.

73,

Geoff.

-- 
Geoffrey S. Mendelson,  N3OWJ/4X1GM/KBUH7245/KBUW5379