October 29, 1984 HD-3030 Bulletin No: RTTY Terminal Interface HD-3030-1 Schematic Corrections - U3C & AFSK Board On the schematics for manual [PN 595-3100] and the HD-3030 Blue Book schematics, make the following corrections: On the main circuit board schematic, add an inversion symbol at pin 14 of U3C. On main circuit board schematic, lower left, change 12 V at U1-9 and U3-9 to read NC. On AFSK circuit board schematic, remove the connections between board connector pin 2 and pins 3, 6, 8 and 10. ---------------------------------------------------------------------------------------------- November 30, 1984 HD-3030 Bulletin No: RTTY Terminal Interface HD-3030-2 Repetitive Failure Of CR6, Q10 and Q12 In Terminal Interface units set for current loop operation, the repetitive failure of CR6 [PN 56-16], Q10 [PN 417-936] and Q12 [PN 417-988] can be prevented by installing a normally-closed phone jack [PN 436-4] at S2 and a 110 volt zener diode [PN 56-48] across the loop output. Make this change only when needed. ---------------------------------------------------------------------------------------------- January 31, 1985 HD-3030 Bulletin No: RTTY Terminal Interface HD-3030-3 H/Z To HD-3030 Interconnection Some customers who did not purchase the options for the HD-3030 may ask for information for connecting the H/Z-89 Computer to the HD-3030. Here is the interconnect diagram from the HDP-1010 Super CW software manual for your reference: DTE PORT 3300 H8 OR H89 ----- ------- Ground 1 ----------- 1 ------- | x Grnd HD-3030 [SOUT] Rtty Data out 3 ----------> 2 ----------------------->[Pin 6] AFSK IN [SIN] Rtty Data In 5 <--------- 3 <-----------------------[Pin 4] RS-232 DM OUT [RTS] PTT 7 ----------> 4 ----------------------->[Pin 25] RS-232 Send-P [DSR] CW Data In 11 <---------- 6 <-----------------------[Pin 3] T(Squared)L DM OUT [GND] 13 ----------- 7 CW Data Out 14 ----------> 20 ----------------------->[Pin 2] Key-N | | [15 Pins] [25 Pins] [From Transceiver to HD-3030] RX AUDIO [SPKR OUT]--------------[Pin 13] AFSK Audio Out CW/PTT [KEY/CONTROL]------------------------------[Pin 10] XMIT-P (Note: Both CW/PTT lines have 1N4001 Diode in-line) TX AUDIO [MIKE IN]------------------[Pin 12] AFSK Audio In [Pin 15] TO GROUND ((Hope the above is understandable. When I have the scanner hooked up I will forward the above to the Heathkit Web Page)) ---------------------------------------------------------------------------------------------- January 31, 1985 HD-3030 Bulletin No: RTTY Terminal Interface HD-3030-4 Unit Outputs Data To CRT When 425 Hz Or 850 Hz Pushbutton Pressed During Reception Of 170 Hz Shift Signals This is normal operation. A voltage drop across D1 on a filter board allows a very small amount of signal to reach the demod board. Because the demod board is sensitive, it amplifies the small signal enough to be displayed on the CRT. In most cases, the signals from the selected filter boards will over-ride the residual signal from the unused filter board. ---------------------------------------------------------------------------------------------- Mary 31, 1985 HD-3030 Bulletin No: RTTY Terminal Interface HD-3030-5 When the [PN 56-48] zener diode is installed according TEB HD-3030-2 in the 1984 TEB Book, the loop output won't function reliably when used as an input. To correct this problem, remove the #56-48 zener diode. When the shorting jack [PN 436-4] is installed and the criteria outlined in the "Caution" box on page 62 of the manual [PN 595-3100-2] is met, the zener diode is not needed. Mark the change on TEB HD-3030-2 for future reference. ---------------------------------------------------------------------------------------------- Thats everything I hold up to 1989 that covers the HD-3030. Enjoy! ---------------------------------------------------------------------------------------------- 73 de Joe W7LPF/4 [NNN0KUU] QWCA - SOWP - NCVA - FISTS - RCC Gordonsville, Va 22942 [Orange Co]