[Hallicrafters] monitoring cw

[rbethman]

I live very close to several AM BC stations.

I use a Johnson T/R SW and have never had an issue with any interference.

A fellow Amateur HAS had issues, but we got him straightened out with 
re-working his feed-lines.  Sometimes there are other things that cause 
the RFI and intermod.

I was trying to purchase the one station about a decade ago.  It didn't 
pan out.  It is just as well, as this area really wouldn't do well in 
the marketing realm.  The population is less than 160K.  It causes the 
stations here to constantly change hands.

Bob - N0DGN


On 1/25/2014 2:52 PM, mac wrote:
> I ran into severe cross and intermodulation problems with electronic 
> T-R switches when I lived near a strong AM BC station a while back.
>
> Dennis D.  W7QHO
> Glendale, CA
>
> ******************
> On Jan 24, 2014, at 9:04 PM, W7FE wrote:
>
>> Hi Bob,
>>
>> I've always been a fan of the 'Electronic T-R Switch'. Commercially 
>> made by EF Johnson and B&W, but a fun homebrew project as well, its 
>> single tube (plus rectifier)  design provides a few db of gain while 
>> receiving and effectively cuts off the signal to the receiver when 
>> transmitter RF is present. However, just enough RF passthrough is 
>> available to provide a monitor signal without overloading most 
>> receivers. You even get to listen to your own clicks, chirps, and 
>> signal 'shape' as heard by the receiving station(s).
>>
>> Some folks used to report increased TVI when using  these things, but 
>> I've found them to be trouble free in my stations since 1960. In 
>> fact, I've been using the EFJ model to successfully feed all the 
>> receivers in my current 'system' since about 2004 and have had no RFI 
>> issues.
>>
>> 73 de Stu, W7FE
>> Henderson, NV