[GreenKeys] Need a HAM RADIO correction,Oct 1976 issue

[AA8K73 GMail]

The Short Circuits of the October 1976 issue of hr says:


In the schematic of the DT-600 RTTY demodulator in the February, 
1976, issue of ham radio one end of the 10k balance pot (at the 
input to U1, wiper connected to R9) should go to -12Vdc.  This 
pot should be labeled R8.  In fig. 5 the horizontal axis was 
measured in Hz but mistakenly labeled in baud; none of the 
standard RTTY speeds (60, 75, and 100 wpm) are attenuated. 
Potentiometers to fit the circuit board are available from Data 
Technology Associates, Inc. Box 431912, Miami, Florida 33143.  A 
set of four pots is priced at $2.00.


The March 1976 issue has an article about the DT-500 
demodulator, but I didn't see any letters.


Mike - AA8K


On 03/23/2011 02:55 PM, Steve wrote:
> Hi Guys,
> Ages ago I had a couple of boards made based on the article in the
> Feb 1976 HAM RADIO magazine. Its the DT-600 RTTY TU/converter.
> Finally got around to loading a board (!!!) only to discover it doesn't
> work. A correction was printed in the Oct 1976 issue (short circuit column)
> and a letter was published in the March 1976 issue. Of course I no
> longer have these. If anyone out there has these corrections, sure could
> use a copy. Thanks!
>                                        Steve W6SSP