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Title: B&W L-1000A Post by: k5ygc on October 13, 2014, 11:52:56 AM The manual states that the bias and tuning for AM mode is different than CW and SSB and the info is in supplement #1 I cannot find this info anywhere. Can anyone provide the bias setting for AM mode? Thanks Mark K5YGC
Title: Re: B&W L-1000A Post by: WQ9E on October 13, 2014, 12:06:14 PM Mark,
Supplements 1 and 2 are in the manual on the edebris site. Note that if you have the built in power supply and/or the model without a blower AM power is severely restricted. Title: Re: B&W L-1000A Post by: w1vtp on October 13, 2014, 12:11:09 PM Here is what the L-1000 manual says. AM operation is basically the same for bias settings as SSB. The issue is drive and loading. Careful reading of the pages I am attaching should do the trick.
One needs to load the linear amplifier to be used in AM operation for full power out with a carrier. The drive should be then reduced to approximately 1/6th the full carrier output. Note: some would say 1/4 but I disagree - I suggest 1/6th. This information was made available at http://bama.edebris.com/manuals/b&w/l1000a/ (http://bama.edebris.com/manuals/b&w/l1000a/) But I think you already know that. With the suggested carrier power level I suggest you should have plenty of head room for ~ 125% positive peaks. Be sure to properly phase the microphone input to properly phase the asymmetrical characteristics of the male human voice GL, Al Title: Re: B&W L-1000A Post by: k5ygc on October 13, 2014, 04:54:51 PM Great thanks for the response and your help Mark K5YGC AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
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