[Central-Electronics] Carrier supression on CE100V

[George Maier]

Well Joe, it sounds like you should be seeing over 40 dB, and closer to the original spec of 50.  On the other hand,  I've never used Schottky diodes in a CE 
Exciter, and don't know what to expect.  Perhaps someone else on the reflector has.
Having said that, I don't normally use 1N34A's either, preferring 1N270's instead. They're really close to 1N34's as a modulator, but a lot more robust in the current handling department. 
You might try measuring the carrier balance right at the modulator to eliminate non-linearities in the rest of the chain making it look worse.

73, George- W1LSB 
Sent from my Verizon Wireless 4G LTE DROID

"Fallon, Joseph" <joe.fallon at philips.com> wrote:

>Hi George,
>
>I used 1n5711 Schottky  diodes that I matched the Vf to less the 1%.  The caps were replaced with 10uF, 50V electrolytics with 20% tolerance.
>
>73’s
>
>Joe WA1IWQ
>
>From: George Maier [mailto:george at maiergroup.com]
>Sent: Tuesday, January 29, 2013 9:51 AM
>To: Fallon, Joseph
>Cc: central-electronics at mailman.qth.net
>Subject: Re: [Central-Electronics] Carrier supression on CE100V
>
>Hi Joe:
>Did you match the diodes and caps?
>73, George- W1LSB
>
>Sent from my Verizon Wireless 4G LTE DROID
>
>
>"Fallon, Joseph" <joe.fallon at philips.com<mailto:joe.fallon at philips.com>> 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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