[600MRG] 735 mods

[N1BUG]

"Stuff" has happened here in the past, which is why my system is now 
designed to prevent some of the more expensive mishaps...

In my case it is done like this:

The only way I can get RF to flow to the next room where the LF/MF 
transmitting stuff resides is to click either the LF or MF button in 
an application running on my PC. Doing so does several things:

QSYs the radio to 10.474 (MF) or 10.136 (LF). Unfortunately it can 
only QSY in 1 kHz increments, so direct move to 10.474.2 is not 
possible. This is annoying!

Sets the radio power output to 10W (down from ~100W)

Energizes a relay which routes RF from the radio to my transverter 
drive attenuator (which is used for all bands where I have a 
transverter... LF, MF, and some VHF/UHF bands). At 10 MHz, output 
from the attenuator is 0 dBm (1 milliwatt)

Energizes a relay which sends RF to the next room where the LF/MF TX 
converters are.

Ideally this system would be extended to also switch relays to 
select either the LF TX converter or the MF converter and route the 
proper PA to the antenna, etc. However this would be a significant 
redesign of the system control architecture and is not possible with 
current software.

By the way, the common transverter drive attenuator can easily 
handle 250W and the converters would not be damaged by 10 
milliwatts, so even if somehow the power control CAT command to the 
radio failed, the magic smoke would not escape from anything.

Paul



On 01/26/2018 10:04 PM, 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
> 
> 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