[TenTec] Computer Headset Secured -- Now What?

[Bob McGraw - K4TAX]

Well I must be one lucky fellow.    Just to make sure, I picked up my 
El-Cheap-O headset and tried it with the Eagle.  I'd previously used it with 
the Omni VII.

With it on the Eagle, I don't hear any digital noise.  I do notice that the 
volume in the right ear is louder than the volume in the left ear.  Also 
noticed this with the Omni VII but I figured for less than a $6.00 
investment including shipping, this wasn't too bad.

Other than a slight noticeable loss in high frequency response on receive, 
thus making stations sound a bit muffled, they sound reasonable.  These 
El-Cheap-O headphones do require advancing the AF Gain on RX a good bit more 
to get suitable listening level.

On the CPU noise, when the AF Gain is at minimum, full left, there is a bit 
of digital noise heard.  Moving the AF Gain off of the most left stop 
eliminates the noise being heard.

73
Bob, K4TAX




----- Original Message ----- 
From: "Rick - DJ0IP / NJ0IP" <Rick at DJ0IP.de>
To: "'Discussion of Ten-Tec Equipment'" <tentec at contesting.com>
Sent: Tuesday, April 02, 2013 6:22 AM
Subject: Re: [TenTec] Computer Headset Secured -- Now What?


>I hate to resurrect a dead thread, but I just received my el Cheap'o
> Headset, the SM-750M.V today.
>
> Unfortunately they do not mate well with the Eagle.
> I won't be able to use them.
>
> As many of you know, the Eagle has a funny audio noise which some people 
> are
> calling "CPU noise".
> This noise is normally only audible on headphones and only when not
> receiving a station...in other words, only when listening to static.
>
> Unfortunately this noise is quite audible on my cheap headphones.
> I will compare it to a couple other headphones:
>
> <> Sennheiser HD 414 SL:   S1/S2
> <> Sennheiser PC 350:      S1 (almost S0)
> <> SM-750M.V:              S3/S4 (almost un-usable)
> <> Telex Xtal Headphones:  S0 (just barely discernible)
>
> I have no idea of the difference in frequency response of these different
> headphones, but there is one heck of a difference in the signal level of 
> the
> interfering audio noise.
>
> The Telex headphones have always been my favorite overall, because they 
> are
> so lightweight.
> Of course they are mono, not stereo.
> Here's a picture of them: http://www.dj0ip.de/gallery/old-telex-headset/
>
> The new el Cheap'o just isn't going to work.  In fact I can even hear the
> noise when listening to stations, not just static.
> I'm not a happy camper, but my loss was about $10 including shipping to
> Europe.
> I guess I can always use them for something else.
>
> 73
> Rick, DJ0IP
>
>
> _______________________________________________
> TenTec mailing list
> TenTec at contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
>