[600MRG] 735 mods

[Edward R Cole]

Took me some head scratching to figure out what you were talking about.

driving a low level mixer at 10mw.  If you demand 
to run your HF radio at 100w then you need a 
40-dB 100w atten.  But why not tap the drive 
inside the HF radio beore the final driver which 
typically sees about 50mw input for 10w 
out?  10Log(10/50) = - 7 dB with a common 1w atten.

73, Ed

At 06:04 PM 1/26/2018, J Mcvey wrote:
>10 mw in is a whole lotta attenuation even from 5w!
>There is too much opportunity for an "oops, that 
>was 100 watts" type mistake, which I can see me making...
>
>
>On Friday, January 26, 2018 3:56 PM, Edward R 
>Cole <kl7uw at acsalaska.net> wrote:
>
>
>I use the free schematic sw from ExpressPCB.
>www.expresspcb.com
>
>
>I have made a few boards with them, too
><http://www.kl7uw.com/control_box.htm>http://www.kl7uw.com/control_box.htm
>
>73, Ed
>
>At 10:49 AM 1/26/2018, N1BUG wrote:
> >I decided I don't need linear modes and wanted
> >more RF output so I took it a step further.
> >Sorry about the rough hand drawn schematic. I'm
> >too busy building to be bothered fighting with software to draw it nice. ;-)
> >
> >I have a similar converter for 2200m which uses
> >the same mixer to keep cost down.
> >
> >Paul
> >
> >On 01/26/2018 02:37 PM, Kenneth G. Gordon wrote:
> >>On 26 Jan 2018 at 9:47, Edward R Cole wrote:
> >>
> >>>
> >>>Like this?
> >>SNAZZY! :-)
> >>Ken W7EKB
> >>
> >>>
> >>>At 08:19 AM 1/26/2018, Dick Bingham wrote:
> >>>      Ah, it has been years since I read about
> >>> the escapades of "Need new thread for this one,
> >>>      Hon Ed. sez my sidekick, Hashtafisti
> >>> Scratchie!!! Today, the PC-Police would be all-over
> >>>      that column.
> >>>
> >>>      For those reading this thread about
> >>> RX/TX on 630-meters, receiving and virtual direct
> >>>      read-out of frequency is easily
> >>> accomplished by tuning a tranceiver to 30-meters and using
> >>>      a doubly balanced mixer (DBM) and an external 10MHz LO .
> >>>
> >>>      Connect a suitable antenna-wire directly
> >>> to the DBM input port, a 10MHz source to the LO
> >>>      port and the DBM IF-port  to the
> >>> antenna port of the xceiver. Tune the tranceiver to
> >>>      10.4xxMHz (ignore the leading "10" and
> >>> look only at the digits following the decimal-point
> >>>      to read the 630-meter frequency)Â  and
> >>> you are listening to 630 meters. Potential for lots of
> >>>      birdies without an input tuner but you
> >>> will have a decent receiver for the new band.
> >>>
> >>>      TX on 630m is similarly easy if your
> >>> tranceiver has low power transverter ports.
> >>>      Appropriate BPF's and an amplifier puts
> >>> you on 630m. City-lot antenna installations will be
> >>>      your main challenge on 630m.
> >>>
> >>>      Get busy and join the fun!
> >>>
> >>>      73 Dick/w7wkr and wd2xsh-26
> >
> >
> >
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>73, Ed - KL7UW
>   <http://www.kl7uw.com/>http://www.kl7uw.com
>Dubus-NA Business mail:
>   <mailto:dubususa at gmail.com>dubususa at gmail.com
>
>
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73, Ed - KL7UW
   http://www.kl7uw.com
Dubus-NA Business mail:
   dubususa at gmail.com 
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