Related Manuals for Midian Electronics BTD-1A
Summary of Contents for Midian Electronics BTD-1A
- Page 1 BTD-1A Burst Tone Decoder – 1200-2600 Hz BTD-1B Burst Tone Decoder – 700-3000 Hz Manual Revision: 2012-10-19...
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Page 2: Specifications
+5.5-15 VDC Operating Current 3 mA Operating Temperature -30 - +60 C Dimensions 1.87” L x 1.0” W x 0.34” H BTD-1A - Frequency Range 1200-2600 Hz BTD-1B - Frequency Range 700-3000 Hz Band Width 0.5% Input Level 10 mV-2.0 V RMS... -
Page 3: Hardware Installation
HARDWARE INSTALLATION Be certain to follow standard anti-static procedures when handling any of Midian’s products. P1-1 – Green – Transpond Out – Provides a low output (200mA) approximately 2 seconds after the horn output. P1-2 – Red - +5.5 – 15 VDC – Connect to switched B+ in the radio. P1-3 –... -
Page 4: Hardware Alignment
HARDWARE ALIGNMENT The frequency of the BTD-1 is set using one of two methods: Method 1 Install JU1 and, while monitoring Pin 7 of U1C with a frequency counter, adjust R15 to the desired frequency. Remove JU1. Method 2 Inject an audio signal, at the proper amplitude, on the desired burst tone frequency into the orange lead. While observing Pin 7 of U1C with a scope, adjust R15 for a peak in amplitude. -
Page 5: Circuit Description
Q4, and the brown repeater output lead, Pin 3, will float. The white call light lead, Pin 9, and the green/white squelch output lead, Pin 8, will also reset. MIDIAN CONTACT INFORMATION MIDIAN ELECTRONICS, INC. 2302 East 22 Street... - Page 6 This page intentionally left blank...
- Page 7 .022u .47u .47u NOTES P1:4 TONE IN LEVEL R4 GAIN ADJ GROUND BLACK 7.5K 1.8K 10-50mV RMS DOCUMENT NAME MIDIAN ELECTRONICS, INC. BTD-1-A 5.6K 2.7K 50-500mV RMS 500-1000mV RMS OMIT R4 APPR DATE: 1986-10-28 DWN BY: SCHEMATIC SHEET PROJECT NUMBER...
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- Page 11 .022u .47u .47u NOTES P1:4 TONE IN LEVEL R4 GAIN ADJ GROUND BLACK 7.5K 1.8K 10-50mV RMS DOCUMENT NAME MIDIAN ELECTRONICS, INC. BTD-1-B 5.6K 2.7K 50-500mV RMS 500-1000mV RMS OMIT R4 APPR DATE: 1986-10-28 DWN BY: SCHEMATIC SHEET PROJECT NUMBER...
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