KRX3 band pass filters needed?

[VE3WDM]

Good evening all, just ordered the KRX3 for the K3. One thing I was going to use the KRX3 for was to hook my attic dipole to the KRX3  as it is a very quite receiving antenna. The main receiver was going out to my vertical. Do I need band pass filters not sure about this? I would rather know first than pay the consequences later.
Thanks for your time
Mike VE3WDM
http://ve3wdm.blogspot.com
     
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[Don Wilhelm-4]

  Mike,

You did not include the "coupling factor" information between your
transmit antenna and the receiving antenna.
It depends on the physical separation of the antennas, the relative
orientation, and a host of other factors that cannot be predicted
without all the details.  An attic antenna in a one story house is
different than in a two story house, and a vertical at one end of the
gable for that house is different than a vertical located 200 feet away
from the house.  Is the attic antenna a dipole oriented at 90 degrees
from the direction of the vertical, or is the vertical more off the ends
of the attic dipole.

No answer can be given until all details of that nature are available.  
The easy solution is to just try it and see.  If you hear the COR relay
clicking, then you have a problem that needs to be solved.

73,
Don W3FPR

On 9/12/2010 7:00 PM, Mike Weir wrote:
> Good evening all, just ordered the KRX3 for the K3. One thing I was going to use the KRX3 for was to hook my attic dipole to the KRX3  as it is a very quite receiving antenna. The main receiver was going out to my vertical. Do I need band pass filters not sure about this? I would rather know first than pay the consequences later.
> Thanks for your time
> Mike VE3WDM
> http://ve3wdm.blogspot.com
>
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[AC7AC]

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[Bill W4ZV]

VE3WDM wrote

Good evening all, just ordered the KRX3 for the K3. One thing I was going to use the KRX3 for was to hook my attic dipole to the KRX3  as it is a very quite receiving antenna. The main receiver was going out to my vertical. Do I need band pass filters not sure about this?

The KRX3 has a full set of ham band band pass filters, so you don't need the KBPF option unless you plan to use diversity outside the ham bands.  You'll also need to duplicate (including any offsets for 5-pole filters) the exact filter setup you have in your Main receiver.

CAUTION:  Once you use true diversity, you'll never be happy with any rig without it!

73,  Bill

[VE3WDM]

Good Morning Don, The Dipole is in a two story townhouse and it is 90 degrees in orientation to the vertical antenna. I would say the separation between the two is about 40 to 50 feet. The vertical antenna is a High Sierra sidekick located at ground level. I use it for CW at 50 to 100 watts.  I was talking to Gary at Elecraft and he suggested others have used model 197 or 197  RF Limiter / receiver protect by Iceproducts. I will look into that too and this COR relay is it a very noticeable clicking if it was to be activated?
Mike
VE3WDM

[Vic K2VCO]

I missed the original message, but if the dipole is coax fed, a balun at the feedpoint
will go a long way to reducing pickup from the vertical. Might even solve the problem
entirely.

On 9/15/2010 3:28 AM, VE3WDM wrote:

>
> Good Morning Don, The Dipole is in a two story townhouse and it is 90 degrees
> in orientation to the vertical antenna. I would say the separation between
> the two is about 40 to 50 feet. The vertical antenna is a High Sierra
> sidekick located at ground level. I use it for CW at 50 to 100 watts.  I was
> talking to Gary at Elecraft and he suggested others have used model 197 or
> 197  RF Limiter / receiver protect by Iceproducts. I will look into that too
> and this COR relay is it a very noticeable clicking if it was to be
> activated?
> Mike
> VE3WDM

--
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco/
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