Re: FDM-DUO overload issues
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For what it's worth - I suffered overload from nearby AM stations in my last QTH. I was using a Wellbrook loop and had to change to the interface box with the lower gain - that helped.
In my current QTH I have a very nearby AM station. My end-fed antenna overloads the Duo, but an inverted L and the Wellbrook do not, so you could be on the margin for your location. I also have the QSF-06 - I'd say it helped 'a bit'.
I second the comment to see if you can get a panadapter going to identify any really obvious signals in the coverage range. Also, (if you haven't already) confirm you really don't have an AM station nearby - radio-locator.com can help. I'm two miles away from a 15kw station I didn't know about until I saw it in the panadapter one day.
Cheers - Chris
On Wed, May 27, 2020 at 4:00 PM Steve Knell <c6tradingltd@...> wrote:
Very interesting Clint. I suspect my problem is due to the cumulative effect of all signals across all the shortwave bands resulting in overload and general breakthrough issues. When I experienced the breakthrough on 20M I switched to a coax fed half-wave vertical and the breakthrough disappeared. So I think that using an open wire fed doublet isn't helping the situation. I can sort of live with it but it would be nice to find a solution without replacing the radio. Enabling the attenuator helps most of the time, but not always.