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Old February 28th 08, 02:19 PM posted to rec.radio.shortwave
Pete KE9OA Pete KE9OA is offline
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First recorded activity by RadioBanter: Jul 2006
Posts: 271
Default Drake R8 question

No, it is using the same 1st mixer. In my service manual for the R8E, right
after the input switching diode for the MW range, I see the attenuator. I
just talked to Bill Frost, over at Drake, and he tells me that all of the
front ends are the same. If this is the case, it shouldn't be too hard to
remove it. They may have pulled a tricky one, the JRC did with the MW range
on the
NRD-515.
On another note, I have built the first engineering prototype of the new
Palstar active loop antenna. There was a bit of a delay receiving the
ferrite rod stock, but that should be coming in, in the next few days or
so.
I still need a few PCB footprint files.........after this, I will be able to
do the board layout. It shouldn't take more than a few hours to do.

Pete

"dave" wrote in message
...
Drakefan wrote:
Pete KE9OA wrote:

I may be picking up one of these things tomorrow. Looking at the input
bandpass filter schematic, I notice a T type of attenuator that consists
of two 270 ohm series resistors, with a 330 ohm shunt resistor on the MW
filter section.
Am I dreaming, or did Drake really dumb down the design with a full time
attenuator on the MW band? If this is the case, it looks like I have yet
another project.

Pete


I don't see that attenuator on the MW (0.5-1.5-Mhz) bandpass filter for
the R8'B'. The MW bandpass circuit on the 'B' looks like all the other
bands but with different component values of course.


Different first mixer?