[Elecraft] Amplitude variation on K3S with JT65B

[Conrad PA5Y]

I wish people would actually read emails.....

I stated:

4.  The audio from WSJT-X been measured on a UPV audio analyser and there is less than 0.1dB variation when using a UMC404HD sound card.

I even numbered the relevant stuff to make it easy to read. A UPV audio analyser is quite good at it's job and something of an industry standard in EU broadcast measurements.

It seems that the stock 2.7kHz filter is the culprit. Confirmed privately by 2 EME operators and by Jim K9YC. So I will buy a couple of Inrad 2.8kHz filters.

73

Conrad PA5Y



-----Original Message-----
From: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> On Behalf Of Jim Brown
Sent: 21 October 2020 20:49
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] Amplitude variation on K3S with JT65B

On 10/21/2020 10:56 AM, Rick NK7I wrote:
> Also the response of the sound card has some variation at different 
> pitches (it's not a totally flat response), so try different tones.

If it does, it's broke, or a piece of crap.

73, Jim K9YC
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html Message delivered to g0ruz at g0ruz.com