[CQ-Contest] 10/15 interaction

[Steve Lott]

Joe,

what u are recommending will not work on a transmit port......

The DX Engineering
DXE
-
RG
-
5000
Receiver Guard
should be used
on any radio
*receive only antenna *
*input*
for low


They do work well for rcv antenna ports (I have one of each of my rigs rcv
port jacks)
cheers!
steve


http://www.KG5VK.com
My Ham Radio Friends


On Thu, Nov 6, 2014 at 11:15 AM, Joe <nss at mwt.net> wrote:

> 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
>>
>>
>>
>> _______________________________________________
>> CQ-Contest mailing list
>> CQ-Contest at contesting.com
>> http://lists.contesting.com/mailman/listinfo/cq-contest
>>
>>
>>
> _______________________________________________
> CQ-Contest mailing list
> CQ-Contest at contesting.com
> http://lists.contesting.com/mailman/listinfo/cq-contest
>