[Lowfer] Bench testing was a huge disappointment

[riese-k3djc at juno.com]

maybe i havent been paying attention but are you using for the mixer ?
disregarding input/output filters and if you are using a DBM it should be

a no brainer, I built a DBM rcv converter some time ago and it fired
right up.
the same idea would make a tx mixer. wonder if you may have fried the
mixer

mini circuits have good DBM for a couple of bux that will produce a nice
power  level to drive the amp
good luck ,, 

bob k3djc



On Thu, 11 Mar 2010 19:56:56 -0800 (PST) Andy - KU4XR <ku4xr at yahoo.com>
writes:
> I guess it could be said; " welcome to the world of homebrewing,
> and point to point wiring. " - - - Did some more testing on the
> HF to LF converter and did not like the results. I can not get 
> it to pass an HF signal at LF for some reason unknown to me.
> I first tried the HTX-100 on 28 MHz, and never could get it to
> pass a LF signal. So I switched to the TS450S to see if that 
> made a difference. Nope !!! I tuned above and below looking for 
> the signal, but none to be found. Then I thought the 28 MHz XTAL
> might not be oscillating, so I changed it, and still nothing.
> Finally tried a 10 MHz XTAL and still no LF !! I can connect my
> scope to the Input of the converter and get a reading, then
> step thru the stages and see the level changes, all the way to
> the output and the scope reads a signal coming thru the converter.
> I ran up to 5 watts into it, and no LF signal. Changed the IC's
> and still no LF. I'm Fum-Buzzled. Now the only thing I know to do
> is to start tracing the individual circuits with an Ohm-Meter to
> see if something may be grounded that shouldn't be.
> For some reason,I have this sneaky feeling that the SA612AN is
> not oscillating, and therefore not passing the fundamental signal 
> thru to LF. Those holes on the perfboard are awfully close together
> so I may have a solder bridge somewhere. I checked the IC sockets
> for shorts between pins earlier, but may have missed something.
> 
> Someone tell me if my thinking is wrong; If the SA612 ( NE602 )is
> working properly, and oscillating; When I run the fundamental
> signal into it, I should get a raw signal at LF on the IC output
> pin. IE ::: 10.185 MHz into the chip should output 185 KHz ???
> 
> Thanks for reading, and any past experiences shared will be most
> appreciated.
> 
> 73 to all ::: 
> 
> 
> Andy - KU4XR - EM75xr - Friendsville, TN. USA
> LOWfer Beacon " XR " @ 185.29875 KHz ( QRSS-60 )
> Coordinates:  N:  35º 43' 54" - W:  84º 3' 16"
> http://www.myspace.com/beaconxr
> http://webpages.charter.net/ku4xr/
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