[R-390] Broadband RX Loop amplifier for experimentors

[Thomas Frobase]

Thank you Bob, mine works well too ... tom

-----Original Message-----
From: R-390 [mailto:r-390-bounces at mailman.qth.net] On Behalf Of Robert
Newberry
Sent: Sunday, February 05, 2017 6:47 PM
To: r-390 at mailman.qth.net
Subject: Re: [R-390] Broadband RX Loop amplifier for experimentors

I have one of these in service at my work bench. I use it for testing
receivers after I've completed working on them.

I like it!

N1XBM
Apparare Scientor
Paratus Communicare
Allstar Node # 27086, 41540, 41812, 42086, 42658, 42657
www.radioguysrepeaternetwork.com

On Feb 5, 2017 5:40 PM, "Thomas Frobase" <tfrobase at gmail.com> wrote:

> About 5 years ago I distributed some kits, the kit consisted of two 
> units one at the radio the second in an attic or other sheltered 
> place.  The second unit contains a phantom powered broadband (HF) 
> differential amplifier feed by a single 50 ohm coax cable.  The inside 
> unit by the radio connects to a nominal 12 volt supply for power 
> injection to the loop amplifier, provides an antenna connection to the 
> radio receiver and a third connection to the loop amplifier.  The loop 
> amplifier has an internal relay that is engaged while 12 volts is 
> available, when power is removed the loop is shunted by a neon bulb.  
> So in essence, when transmitting nearby simply remove the 12 to the 
> power injector and the unit is protected.  The power injector is also 
> fused.
>
>
>
> I have used the unit pictured in the attached link for over 5 years, 
> it is permanently connected to my AFEDRE software defines radio, and 
> sometimes my R-390A, due to high noise here it provides access to 80 
> and 160 meters as well as Standard Broadcast.  Rather than 
> resurrecting the kit I have decided to provide the loop package as a 
> completed and tested package.  I have a limited amount of completed 
> units available for shipment.  The link to the paper and kit 
> instruction files are http://www.kitparts.com/loop  Please contact me 
> off the list for pricing and delivery options, thanks tom, N3LLL
>
>
>
> tfrobase at gmail.com
>
>
>
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