[Central-Electronics] Carrier supression on CE100V

[k6jek]

People claim 60 dB but I'm not sure I believe them. After fighting the good fight including rebuilding the audio phase shift network which requires calibrated lab-grade equipment to accomplish, I achieved 50 dB at a single frequency with maybe 45 db for most of the audio spectrum. 

I could send you the spectrum analyzer plot if you're interested. I don't think I can attach photos on this reflector.

Jon

PS: Rebuliding the audio phase shift network isn't an activity to be undertaken lightly. The parts must be bridged to .1%. I had access to a just calibrated Stanford Research SR720 LCR  which has .05% accuracy if I remember correctly. Using ordinary, really good equipment, I would have just made everything worse.

On Jan 29, 2013, at 6:29 AM, Fallon, Joseph wrote:

> Hi Folks,
> 
>   Anyone know the typical spec for the carrier suppression of the CE100V?  Replaced the Mod diodes and Caps, tweaked  the 8MHz osc and I'm seeing about 35db which still seems to be on the low side?
> 
>   Tnxs,
> 
>   Joe WA1IWQ

On Jan 29, 2013, at 6:29 AM, Fallon, Joseph wrote:

> Hi Folks,
> 
>    Anyone know the typical spec for the carrier suppression of the CE100V?  Replaced the Mod diodes and Caps, tweaked  the 8MHz osc and I'm seeing about 35db which still seems to be on the low side?
> 
>    Tnxs,
> 
>    Joe WA1IWQ
> 
> 
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