[Premium-Rx] Introduction, and a RF-590A question

[Peter Gottlieb]

Interesting.  It calls out a NF of 10 dB which isn't far from that of the 
receiver itself.  There are some real low NF preamps out there now but things 
like AM broadcast swamp them so you need filtering before them, so if you're not 
careful up goes your NF again.  Still, I would love to have one of those 
RF-591A's but haven't seen any around at anything near what I could afford.

Peter



On 8/7/2014 6:58 PM, Chuck Maurer wrote:
> I agree with Peter.  I have two RF-590A's and both came with the A19 
> preselector and I promptly disconnected both A19 modules and the 590A's came 
> alive.  I also have a RF-591A pre/postselector which is a different story. 
>  This baby really works.  It is a separate housing and is connected to a 
> special interface board in the 590A.  It has RF filtering that is 
> automatically controlled by the interface or its front panel.  It also 
> contains several RF amplifiers.  You can here a distinct improvement in signal 
> strength and selectivity but at a price......
>
> See RF-591A at 
> http://www.torontosurplus.com/harris-rf-591a-04-pre-postselector.html
>
> Inline image 1
>
> Chuck
> W5API
>
>
> On Thu, Aug 7, 2014 at 5:29 PM, Peter Gottlieb <hpnpilot at gmail.com 
> <mailto:hpnpilot at gmail.com>> wrote:
>
>     I can go take photos of how mine is connected but first let me ask you why
>     you want it?  The receiver is very selective without it, and it is
>     designed to make the receiver functional in an installation where there
>     are multiple high power transmitters running while it is receiving.  You
>     lose a bunch of sensitivity by having it in line.  I have a mod which uses
>     the NB button to bypass the preselector and I've found over the years that
>     I have not found a situation where I needed the preselector.
>
>     Peter
>
>
>
>
>     On 8/7/2014 6:11 PM, Brian Gieryk wrote:
>
>         Hello to the list from a new member.
>
>         My name is Brian Gieryk (KE6IYC, 1994) and I currently reside in Apple
>         Valley, CA.
>
>         I am a Television Transmitter Engineer by trade, but do a lot of other
>         things, as well.
>
>         Currently, I drive an Icom IC-R9000, and a Harris RF-590A as my
>         primary receivers.
>
>         Most of my interest lies in monitoring Fire comms, and anything odd I
>         can find from DC to Daylight, as they say.
>
>         I am also very interested in an all band (HF, 2-30) vertical, that
>         works without a tuner...
>
>         Now for my question,
>
>         My 590A has a preselector (thanks to Mike Murphy) but I do not have
>         any of the cabling to connect it to the radio.
>
>         Can someone provide details on just how it connects?
>
>         I have a full factory original manual, but someone who has added the
>         preselector would be better to advise on what to do or not do.
>
>         Thank you in advance,
>
>         Brian
>         KE6IYC
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> -- 
> L.O.Chuck Maurer
> President
> Alternative INK
>