Topband: Protecting an Array Solutions K9AY Loop from Transmitted RF

[Tim Duffy]

Hello Pete:

This is the RX limiter we use to protect front ends at K3LR. 

https://www.dxengineering.com/parts/dxe-rg5000hd

It works very well.

73
Tim K3LR

-----Original Message-----
From: Topband [mailto:topband-bounces at contesting.com] On Behalf Of N4ZR
Sent: Friday, October 11, 2019 7:50 AM
To: Alan Swinger; topband reflector
Subject: Re: Topband: Protecting an Array Solutions K9AY Loop from Transmitted RF

Array Solutions no longer handles the K9AY components, which actually 
came from K9RU's Wolf RF Systems.  It looks like the ICE limiter is 
still out there, and reasonably priced, but I have no idea whether it's 
a good design - it's pretty old - or just a pair of diodes back to back.

73, Pete N4ZR
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On 10/10/2019 10:08 PM, Alan Swinger wrote:
> I use a Model 197 RF Limiter/Arrestor by Industrial Comms Engineers for my K9AY Loop. I think I got it from DX Eng ~ 10 yrs ago, but also chk w/ Array Solutions since I think they now handle the K9AY Loop. - Alan K9MBQ
>
>
> -----Original Message-----
>> From: N4ZR <n4zr at comcast.net>
>> Sent: Oct 10, 2019 9:30 PM
>> To: topband reflector <Topband at contesting.com>
>> Subject: Topband: Protecting an Array Solutions K9AY Loop from Transmitted RF
>>
>> I'm in the process of building up a K9AY loop, using the Array Solutions
>> boxes, and it occurred to me that I probably need to work out some way
>> to protect the preamp in the shack-end box from transmitted RF,
>> particularly since the K9AY loop is only about 60 feet from the vertical
>> leg of my inverted L and I'll be running 1500 watts.
>>
>> I can see maybe cutting off the DC to the preamp, but figure that won't
>> be enough. Alternatively, I can probably work out a way to either open
>> or short the feedline coming into the indoor box where the preamp is.
>> Any advice as to which would be best (opening or shorting)?  I only have
>> one spare transistor.
>>
>> Advice much appreciated
>>
>> -- 
>>
>> 73, Pete N4ZR
>> Check out the Reverse Beacon Network
>> at <http://reversebeacon.net>, now
>> spotting RTTY activity worldwide.
>> For spots, please use your favorite
>> "retail" DX cluster.
>>
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