EXPERIMENTS IN AUDIO ADJUSTMENT OF A SHORTWAVE SIGNAL

EXPERIMENTS IN AUDIO ADJUSTMENT OF 

A SHORTWAVE SIGNAL

A week ago, I wanted to record for my YouTube channel the sign on of the clandestine broadcaster, North Korea Reform Radio. I just happened to be there on 7500 kHz at its regular 2030 UTC sign on time. So I fired up the iPhone that was sitting handily on the desk and pressed record. While the three-minute recording was being made, I started playing around with the controls on the Yaesu FTDX3000 transceiver and the little Behringer mixer.

When I uploaded the video to the computer for processing, I discovered that I'd been fiddling much more with the controls than I had realised. I wondered if perhaps others may be interested in "what the heck" I was doing during the recording process. Well.....it's still a recording of the reception of North Korea Reform Radio, but with the addition of a subtext commentary. 😁

So, somewhat by accident, this video shows some attempts made to improve the audio quality of a shortwave signal using the transceiver's own inbuilt facilities plus the external mixer to powered speakers. On this occasion, for the purposes of this demonstration, no use was made of the transceiver's highly effective digital noise reduction (DNR) control. 

From my log, here are the details of reception:

7500 kHz   UZBEKISTAN. North Korea Reform Radio - Tashkent. Sign on at exactly 2030 UTC with its usual Haydn Trumpet Concerto theme music and ID. A fair to good signal but with occasional deep fades and some low-level noise, possibly jamming. September 19, 2017. 





UPDATE:  I've already had four people requesting an explanation of the use and benefits of the mixer. I can't prepare anything right now as I'll be away this weekend travelling with the local photographic society. But next week, I'll do a video explaining the Behringer's facilities and how to set up the mixer in the radio shack. Check the YouTube channel for the uploaded video.

As always, thanks for watching.

73 and good DX to you all.

Rob Wagner VK3BVW

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