I am thinking that if these guys who are having trouble were to add a set of
BP filters it would go a long ways towards keeping the front ends of the
radios from going into gain compression.
Plus if the transmitters are dirty the filters will attenuate noise on the
other bands.
I was reading the contesting section of the ON4UN low band DX'ing book and
see that a pair of 1/4 wave stubs separated by a 1/4 wave of coax makes for
a highly effective bandpas filter. If they have 3 spare 1/4 sections of
RG213 for 20M they could fabricate a very effective bandpass filter.
Bandpass filters are standard fair for SO2R stations - same goes for
Multi-two contest stations. Not sure if these guys have considered
fabricating a tri-plexer based upon the QST article. I have built two of
them and they work great. Sounds like they need a little mentoring regarding
contest band plans and asset allocation for successful contesting. One note
on band plans, 10M and 20M do not play well together. The second harmonic of
20M will come thru loud and clear on 10M. But then if 10M is open, 15M will
be too. So drop 20 and go to 10. Basically the 15M station stays put and the
20M station picks up 10M if it opens.
So where are they going?
73, Don KO7i
On 10/5/2012 12:43 PM, Rick - DJ0IP / NJ0IP wrote:
> A couple of my friends are preparing for an expedition for CQWW and are
testing their config.
> They have 2x TS-590 transceivers and a pair of yagi antennas in close
proximity of each other (about 75' apart).
>
> The problem, they are seeing a broadband noise as soon as they key one of
the transceivers.
> Even with just 5w of power it is wiping out the other rig on all bands.
>
> My old grey cells seem to remember we discussed this here on the Ten-Tec
reflector about 6 months ago or so.
> Does anyone remember the details of this or do I have my wires totally
crossed?
> Was there a fix or have I dreamt this up?
>
> TNX guys, and sorry to spam the group, but if we can get these guys fixed,
we'll have a nice multiplier in CQWW.
>
> 73
> Rick, DJ0IP
>
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> TenTec@contesting.com
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>
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