[600MRG] 735 mods

[J Mcvey]

So I would still have to hack my radio anyway and put a switch of come sort to redirect the output from the PA to the an output jack?
 

    On Friday, January 26, 2018 11:11 PM, Edward R Cole <kl7uw at acsalaska.net> wrote:
 

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

driving a low level mixer at 10mw.  If you demand to run your HFradio at 100w then you need a 40-dB 100w atten.  But why not tap thedrive inside the HF radio beore the final driver which typically seesabout 50mw input for 10w out?  10Log(10/50) = - 7 dB with a common1w atten.

73, Ed

At 06:04 PM 1/26/2018, J Mcvey wrote:

10 mw in is a whole lottaattenuation 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 itnice. ;-)
>
>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 Iread 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 threadabout 
>>> RX/TX on 630-meters, receiving and virtual direct
>>>      read-out of frequency iseasily 
>>> accomplished by tuning a tranceiver to 30-meters andusing
>>>      a doubly balanced mixer (DBM)and an external 10MHz LO .
>>>
>>>      Connect a suitableantenna-wire directly 
>>> to the DBM input port, a 10MHz source to the LO
>>>      port and the DBMIF-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-meterfrequency)Â  and 
>>> you are listening to 630 meters. Potential for lots of
>>>      birdies without an input tunerbut you 
>>> will have a decent receiver for the new band.
>>>
>>>      TX on 630m is similarly easyif your 
>>> tranceiver has low power transverter ports.
>>>      Appropriate BPF's and anamplifier puts 
>>> you on 630m. City-lot antenna installations will be
>>>      your main challenge on630m.
>>>
>>>      Get busy and join thefun!
>>>
>>>      73 Dick/w7wkr andwd2xsh-26
>
>
>
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73, Ed - KL7UW
  http://www.kl7uw.com
Dubus-NA Business mail:
  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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