[TenTec] AM Receiver distortion in Orion II

[Martin AA6E]

The vertical axis is time, about 30 seconds per division.  You see 
approximately two complete playbacks of the 1 minute mp3.

73 Martin AA6E

Ron Castro wrote:
> The EQ settings were flat on both radios.  Actually, there is no receive EQ 
> setting in the TS-870, and the receive EQ on the O2 V.2.037j does not work 
> on AM.  Each receiver was fed to a Behringer UB1202 mixer (settings flat) 
> feeding a Sound Blaster Audigy 2 card in my laptop, also flat.
> 
> On your graph Martin, is the vertical axis time?  If so, how much time is 
> being displayed?  I'm not quite sure how to read that.
> 
>       Ron N6IE
>  www.N6IE.com
> (Formerly N6AHA)
> 
> ----- Original Message ----- 
> From: "Martin AA6E" <aa6e at ewing.homedns.org>
> To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
> Sent: Tuesday, January 23, 2007 5:53 PM
> Subject: Re: [TenTec] AM Receiver distortion in Orion II
> 
> 
>> The second half is clear far better than the first, in my opinion.  It's
>> not a question of low-frequency response, but of distortion in the highs
>> - almost like a little clipping, or maybe some other digital artifact.
>>
>> Ron should tell us what the Audio Eq. setting was, by the way.
>>
>> I ran a spectrum on the file with Spectrum Lab.  The results (for
>> several playbacks) are at http://aa6e.net/aa6e/images/capt0701232044.jpg
>> .  Carl was right that the "good" playback is much wider than Orion's.
>> Orion's spectrum has a very sharp cutoff, but I don't think that's what
>> I am hearing.
>>
>> It would be neat to try this on the Orion I comparing v1 and v2
>> firmware, but I've got a few other things to do right now...
>>
>> 73 Martin AA6E
>>