[NLRS] More on sequencers

[Chris Cox, N0UK]

I like the sound of this too.  Just one word of caution, however - with 
sufficient intermediate stage gain it is quite possible to be putting out 
full power with no i/f drive applied.  There is a fair amount of l/o 
leakthrough with the DEMI 10GHz transverters.  I found I had to add about 
26dB of attenuation between the transverter and one of my amps to prevent 
emitting only about 1dB less output under key-up conditions.  The ALC in 
that amp responded so quickly that this was not evident until I looked at 
the output on a spec-an.

73  Chris Cox, N0UK  email: chrisc at chris.org or chrisc at BritishCarAndDriver.Com
                                              or chris at SotaMINIs.Com
  Home Page: http://WWW.BritishCarAndDriver.Com   http://www.pingjockey.net
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   Come  and join us here in Bloomington, Minnesota, home of the Mall of
    America, July 27  & 28, 2006 for the 40th annual Central States VHF
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On Mon, 27 Mar 2006, Chris Elmquist wrote:

>
>
> On Monday (03/27/2006 at 06:12PM -0500), Glen Overby wrote:
>>
>> The FT-817 has an input (TX INH on the Accessory jack) that will keep it from
>> putting out RF, even when PTT is keyed.
>
> OK.  This is even better.  This is very close to my dream radio which has
> a "Clear To Send" input.  With this sort of capability, you can hold off
> the RF as long as you like while any and everything external gets to the
> right place.  Nice.  Do you still get a PTT output from the radio that
> goes active when any transmit function is activated?  This I would call
> "Request To Send"...
>
> So, you cause the IF radio to transmit--  it asserts "Request to Send".
> Your sequencer now starts and begins flipping relays and keying
> transverters, amps, etc.  The last step the sequencer does is assert
> "Clear to Send" back to the IF rig which allows it to finally make RF.
>
> And this works no matter what mode the radio is in right?  CW, VOX, FM,
> whatever.
>
> Seems ideal to me...
>
> Chris NØJCF
>
> -- 
> Chris Elmquist
> mailto:chrise at pobox.com
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