Since purchasing my new Begali Pearl morse key I’ve been wanting to install the 300hz CW filter into my Yaesu FTDX10. The radio comes standard from the factory with the 500z CW filter preinstalled however, being able to narrow the bandwidth down even further will help to reduce the ringing effect on noisy bands that often plaques CW Ops when trying to catch those very weak DX signals.
Since I had built up some free credit at ML&S by buying all my new radio equipment I decided to put it to good use and put it towards the cost of the optional 300hz filter for the radio.
In years past when I had a Yaesu FT1000MP I installed a full set of filters in it and it made quite a difference DXing on the 160/80/40m bands. Back then things like digital noise reduction (DNR) were in their infancy and so narrow filters were even more important than they are today.
The FTDX10 300hz filter looked very similar to the ones I fitted in the FT1000MP and it doesn’t look like they’ve changed at all over the years.
Removing the cover from the FTDX10 it’s immediately apparent where the filter goes. A neat little cutout in the RF shield draws your eye immediately to the spot.
Fitting the filter is easy enough however, you do have to take care to move the little black wire to one side otherwise it gets caught under the filter and stops it from seating properly onto its connections. There’s not a lot of slack on the wire either so care is needed to not pull it too taught.
I was surprised to see how small the standard 500hz filter is in comparison to the optional 300hz filter.
With the filter safely in position and seated perfectly I had the cover and 9 screws back on in no time at all and then got the radio powered up to check if the menu system had the option of a 300hz filter in CW mode.
Getting on air the filter makes quite a difference to the amount of background noise when listening to weak DX stations. Adding DNR and APF to the equation removes all background noise completely with the 300hz filter making it possible to hear the weakest of CW stations and complete silence in-between.
The bands aren’t in particularly good shape today however, I tuned around on the 20m band and found W7SW in Phoenix Arizona calling CQ. He wasn’t particularly strong but, it was a good opportunity to experience the difference between the filters without any DNR or APF enhancement.
Unfortunately W7SW disappeared before I could make another short video with the DNR and APF on to show the difference. I’ll revisit this again soon and get some video snippets up showing the difference the optional 300hz filter makes with DNR and APF.
More soon …