Heathkit HR-1680 ; Sensitivity: 0.5 µV (10 dB S+N/N) ; Selectivity: 2.1 kHz (-6 dB), 7 kHz (-60 dB) ; Filters ? ; Receiver system: Double conversion superheterodyne Download HEATHKIT HR1680 16-80M CW SSB RECEIVER SCH service manual & repair info for DELCO autórádió Model:16169175 frekvencia raszter átállítása.I also performed Heathkit's recommended changes if the HR-1680 is used with the HX-1681 (see HX-1681 assembly manual page 108 for details). HEATH HR-1680 RECEIVER SCHEMATIC-3.pdf HEATHKIT HR-1680 RECEIVER SCHEMATICS 500 Ham Radio Manuals files magnet Collections. Thumbnails Document Outline Heathkit HR-1680 Full Manual. HR-1680 Full Construction Manual. 104 pages. Catalog no. 595-1830-08. Originally published in 1976, uploaded by David HEATHKIT. MANUAL for the. SSB/CW RECEIVER. Model HR-1680. 595-1830-08 This Manual contains a separate Parts List for each assembly section. Read or download Heathkit HR 1680 Manual PDF with 104 pages. No login, no charge and no limit. SCHEMATIC OF THE. HEATHKITR. SSB/CW RECEIVER. MODEL HR-1680. · NOTES: COMPONENT NUMBERS ARE IN THE FOLLOWING GROUPS: 1-99 PARTS MOUNTED ON THE CHASSIS.