Note
The converter covers a two megahertz segment of the two-meter band, with output on the 10-meter band. Refer to specifications below.
Refer to SBA-300-3 for additional discussion.
Crystal Frequency and Coverage
Converter Crystal Coverage
38.00000 MHz 142 to 144 MHz
38.66666 MHz 144 to 146 MHz (supplied)
39.33333 MHz 146 to 148 MHz
40.00000 MHz 148 to 150 MHz
Crystal Characteristics
Type: HC-6/U
Load capacitance: 10.1 pF
Internal capacitance: 7 pF
Series resistance: 30Ω maximum
Drive level: 10 mW
Mode of operation: 3rd overtone
If a crystal other than 38.66666 MHz is installed, it will be necessary to readjust coils L6 and L7.
Sensitivity:
AM: Better than 0.2 microvolts for 6 db at 3750 Hz bandwidth
SSB: Better than 0.2 microvolts for 12 db at 2100 Hz bandwidth
CW: Better than 0.2 microvolts for 20 db at 400 Hz bandwidth
Noise figure: 5 db or less at 3750 Hz bandwidth
Bandpass: Essentially flat over any 2 MHz segment between 142 to 150 MHz
Frequency:
Input: 142 to 150 MHz (144 to 146 MHz with supplied crystal)
Output: 28 to 30 MHz
Image rejection: 80 db or better at 88 MHz
IF rejection: 50 db or better at 29 MHz
Crystal: 38.66666 MHz plus or minus 3%, 3rd overtone
Power requirements: 130 VDC at 12.5 mA, and 6.3 VAC at 815 mA. Power is normally supplied by the receiver
Tubes: (1) 6DJ8, (1) 6EA8
Photos, general information and specifications from "Heathkit: A Guide to the Amateur Radio Products," by Chuck Penson, WA7ZZE. Used with permission.
