{"id":10157,"date":"2014-07-13T07:17:17","date_gmt":"2014-07-13T11:17:17","guid":{"rendered":"http:\/\/swling.com\/blog\/?p=10157"},"modified":"2014-07-13T11:43:36","modified_gmt":"2014-07-13T15:43:36","slug":"china-radio-international-warbling-on-daves-home-brew-receiver","status":"publish","type":"post","link":"https:\/\/swling.com\/blog\/2014\/07\/china-radio-international-warbling-on-daves-home-brew-receiver\/","title":{"rendered":"China Radio International warbling on Dave’s home brew receiver"},"content":{"rendered":"

\"IMG_7078\"<\/a>My buddy and SWLing Post<\/em> reader, Dave Richards (AA7EE)<\/a>, wrote several weeks ago\u00a0with an interesting comment:<\/p>\n

“I was just now \u00a0tuning around the 31M band on a [regenerative receiver]\u00a0that I am putting the finishing touches on, and noticed that the audio from China Radio International on 9790KHz was not only cutting in and out, but was also warbling, as if the program was being played from a tape machine with a slipping pinch wheel.<\/p>\n

I’m finding it a bit hard to believe that in this day and age, a country like China would be using tape machines in their studios still, but am trying to figure out what other explanation there could be for this. The warbling doesn’t sound as if it is being caused by the propagation. Have you heard this before?<\/p>\n

I have attached a short recording. Please excuse the bassy audio – I need to modify the receiver circuit to provide some bass roll-off.”<\/p><\/blockquote>\n

Click here for Dave’s recording<\/a> or listen below:
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