How about using one of these?
http://www.dxengineering.com/search/department/antennas/product-line/dx-engineering-receiver-guard-5000-electronic-rf-limiters?autoview=SKU&N=4294953330&sortby=Default&sortorder=Ascending
Then you are good on any band too?
Joe WB9SBD
Sig
The Original Rolling Ball Clock
Idle Tyme
Idle-Tyme.com
http://www.idle-tyme.com
On 11/6/2014 9:18 AM, Randall K Martin wrote:
Over the years, I've managed to clean up most of the cross band
interference that occurs when I operate my SO2R station running high
power. The one exception is that I cannot use my 10M monobander to
transmit while receiving on my 15M monobander. This is not surprising,
since they are only separated vertically by about 8 feet. Transmitting
on 10M must be dumping significant power back into the 15M transmitter
(an elecraft K-3) since it causes the COR relays to click and I get
the "HI RFI" error. When this happens, I immediately stop transmitting
and flip the 15M rig over to a tribander on a second tower. Normally,
I'm able to remember not to do this, but in the heat of a contest, I
forget. What I find odd is that I can transmit on the 15M monobander
while the second radio is connected to the 10M monobander and there is
no "HI RFI" problem. In fact, very little interference.
Here's my question. I'm contemplating purchasing a high power band
pass filter (4O3A) to prevent the interaction. I'd prefer not to buy
both a 10M and a 15M filter if I don't have to. My intuition tells me
that I should be able to add the filter to the 10M transmitter. Any
thoughts on this? Is there some other path in which the RF could be
reaching the 15M rig that would render the band pass filters ineffective?
I have dunestar 100W band pass filters on both rigs, placed between
the rig and the amp. I know that adding separation between the
monobanders would help, but my tower configuration isn't really
amenable to adding more separation.
73
Randy K0EU
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