[NLRS] 857D

[Donn - WA2VOI/0]

Hi Joe.
IF you are using the "ALC" control for the 875D to control the output power, you 
might consider a scheme like Mel, KC0P uses: (Mel, if you see this, please hop 
in with details !!)  He biases the ALC to far beyond cut-off ALL the time (even 
in RX).  When he goes to TX mode, he releases the bias to the TX level he needs. 
Most users apply ALC to the desired TX level when they actually go to TX.  This 
type of operation may account for the "spikes" that are prevelent in MOST, if 
not ALL 100 W radios when used as i.f. radios.

It will most likely require an additional relay and maybe a sequencer, but it 
should be worth it !!

Good luck

73 Donn
WA2VOI/0

----- Original Message ----- 
From: "Joe Belany" <joeb116 at yahoo.com>
To: "Northern Lights Radio Society" <NLRS at mailman.qth.net>; <cvvhf at cvvhf.org>
Sent: Monday, August 31, 2009 2:27 PM
Subject: [NLRS] 857D


>
>
> Good morning all,
>
> I just received a call from Sandra at Down East Microwave to let me know my 10 
> GHz transverter is on its way home.  Steve found that both mixers were blown 
> as well as the PA having a bad SMA connector.  The connector was replaced for 
> free as they felt it was a bad part according to Sandra.
>
> I am curious if anyone else is driving their transverter with an 857D.  Scott, 
> N0EDV, and I talked about my IF rig on the phone.  He recalled hearing or 
> reading somewhere that there is a concern with an output spike when the 
> microphone is initially keyed.  Has anyone heard of this or successfully 
> driving their units with an 857?
>
> Joe, AI9Z
> Grid: EN46no
> RV-4, Empenage
> Pounding rivets...
>
>
>
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