Topband: Protecting an Array Solutions K9AY Loop from Transmitted RF

[w5zn at w5zn.org]

I use these at W5ZN. They are excellent.

73 Joel W5ZN


On 2019-10-11 10:07, Tim Duffy wrote:
> 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
> Check out the Reverse Beacon Network
> at <http://reversebeacon.net>, now
> spotting RTTY activity worldwide.
> For spots, please use your favorite
> "retail" DX cluster.
> 
> 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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