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Bitx 40 usb copy

Simon Thompson
 

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Begin forwarded message:

From: College Professor Simon Thompson <nwccenglishprofessor@...>
Subject: Re: [BITX20] Bitx 40 usb copy
Date: April 4, 2017 at 11:20:55 AM PDT
Cc: College Professor Simon Thompson <nwccenglishprofessor@...>

I wonder if the Bitx is overdriving the amplifier, and creating USB distortion, or if the Bits is somehow not adequately suppressing the USB signal that is going in to the amplifier. Have you tried to turn down the output of the BitX by running through the alignment procedure so that you are producing very little output, and thereby not overdriving the amplifier?
On Apr 4, 2017, at 6:17 AM, Rajan Krs <rajankrs@...> wrote:

Sir,
Thanks for replay, is using bitx 40 kit with 200 watts linear some my friends said that my signal having usb copy. IE., When i transmitted the LSB copy is 59 report in USB He gives 56 report how to eleminate usb copy in bitx 40
Thanking you
Rajan.R

On Tue, Apr 4, 2017 at 10:54, College Professor Simon Thompson
What is your question?

Sent from my iPad

On Apr 3, 2017, at 10:17 PM, Rajan Krs via Groups.Io <rajankrs@...> wrote:

Hi every once nice to see you on air. I need some help regarding usb copy please help.to short out the problem in?
bitx 40
 

The Bitx40 has a 4 crystal IF filter. ?Adequate for a 5W rig, though perhaps not for 200W. ?I assume your friend finds your USB signal to be much weaker than the desired LSB signal. ?The uBitx looks better in this regard, you might experiment with patching in that better filter. ?But that would not be trivial to do, definitely a learning experience. ??



On Tue, Apr 4, 2017 at 11:21 am, Simon Thompson wrote:

From: College Professor Simon Thompson <nwccenglishprofessor@...>
Subject: Re: [BITX20] Bitx 40 usb copy
Date: April 4, 2017 at 11:20:55 AM PDT
Cc: College Professor Simon Thompson <nwccenglishprofessor@...>

I wonder if the Bitx is overdriving the amplifier, and creating USB distortion, or if the Bits is somehow not adequately suppressing the USB signal that is going in to the amplifier. Have you tried to turn down the output of the BitX by running through the alignment procedure so that you are producing very little output, and thereby not overdriving the amplifier?
On Apr 4, 2017, at 6:17 AM, Rajan Krs <rajankrs@...> wrote:

Sir,
Thanks for replay, is using bitx 40 kit with 200 watts linear some my friends said that my signal having usb copy. IE., When i transmitted the LSB copy is 59 report in USB He gives 56 report how to eleminate usb copy in bitx 40
Thanking you
Rajan.R

?
 

I think the guy who said he's using a 200 watt amp might linear amp, might be using it in the wrong mode. Having it set on AM, or USB, or CW, or if it's made for something else other than LSB will produce this extra signal. And turning down the output power could help too. Some linear amp kits only want low milliwatt input. With a BITX40 you would want to pick up the signal before it gets to the final amplifier. But other amps expect you to connect a coax between radio and rig, and has many filters to keep your signal clean. That's why I think it could be a user error. Look for the manual online of that model number.?

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