The Drake High Patch manual provides detailed instructions for setting up the device, including connecting shielded cables and bypassing telephone microphone carbon buttons to prevent interference. It also covers operation procedures such as adjusting controls for optimal balance and troubleshooting steps to avoid issues like cross-talk and feedback during use.
Manual Overview
The service manual for the Drake High Patch provides detailed instructions for installation, initial setup, and operation. The High Patch is designed to balance signals between a receiver and transmitter using a bifilar transformer and a NULL LINE control. Installation involves connecting shielded cables between the High Patch, exciter, or transmitter, and ensuring proper connections to the telephone line and speaker voice coil. Initial null adjustment requires tuning a receiver, setting up a call, and adjusting controls to minimize receiver signal in headphones. During operation, the switch should be set to MIKE for direct microphone-to-transmitter connection or PATCH for telephone integration. Proper adjustment of the NULL LINE and XMTR INPUT controls is crucial to prevent cross-talk and ensure optimal performance. The manual emphasizes avoiding unauthorized telephone extensions, excessive signal levels, and leaving the Patch connected when not in use. For specific equipment like the Model 20A Exciter or Collins transmitters, additional wiring instructions are provided to ensure compatibility and prevent feedback issues.
Quick Issues Covered
- Diagnose signal balance issues with NULL LINE adjustments.
- Troubleshoot cross-talk by adjusting RCVR OUTPUT control.
- Use schematic for circuit tracing and voice coil connection issues.
Overview
The High Patch by R. L. Drake Company is a device that incorporates a special bifilar transformer, allowing users to balance the signal between a receiver and a transmitter. The manual provides detailed installation instructions, including connections to microphones, speakers, and telephone lines. It also covers initial null adjustment, operation modes, and guidelines for proper use to prevent issues like cross-talk and feedback. The manual emphasizes the importance of correct setup and adjustments for optimal performance and includes specific instructions for integrating with various radio equipment models.
Specifications
- bifilar transformer
- NULL LINE control
- MIKE input
- RCVR terminal
- SPKR terminal
- PH. LINE connection
- XMTR jack
- XMTR INPUT control
- RCVR OUTPUT control
- high impedance headphones
- audio band pass filter
- internal switching
- Model 20A Exciter
- Collins transmitters
- push-to-talk operation
- two-circuit connectors
- Amphenol connectors
Controls & Indicators
Refer to the PDF for details.
Installation / Setup
The installation of the High Patch involves several key steps. Shielded cables should be used to connect the High Patch to the exciter or transmitter microphone input, with connectors provided. The microphone is connected to the MIKE input on the High Patch. The wires that typically connect to the speaker voice coil should be connected to the RCVR and C terminals on the High Patch, while the SPKR and C terminals connect back to the speaker voice coil. The PH. LINE on the High Patch should be connected to L1 and L2 at the telephone terminal board, typically identified as the red and green wires. The carbon button on each telephone microphone should be bypassed for RF, using a supplied .01 ceramic condenser or a standard bypass from the telephone company. Initial null adjustment involves setting the switch to MIKE, adjusting the RCVR OUTPUT control, and setting the NULL LINE control to the center of its range. A signal is tuned on the receiver, and the level is set for normal listening. During a phone call, the switch is turned to PATCH, and the RCVR OUTPUT control is adjusted for normal telephone listening level. High impedance headphones are used for null adjustment before connecting the transmitter microphone input.
Operation
The High Patch operates by incorporating a special bifilar transformer and a NULL LINE control to balance the signal between the receiver and transmitter. The balance may need adjustment with each new call to prevent the receiver from tripping the transmitter.
For basic usage, the High Patch requires the following steps:
1. Connect shielded cables between the High Patch and the exciter or transmitter microphone input, and connect the microphone to the MIKE input on the High Patch.
2. Connect the speaker voice coil wires to the RCVR and C terminals on the High Patch, and connect wires from the SPKR and C terminals to the speaker voice coil.
3. Connect the PH. LINE on the High Patch to the telephone line (usually identified as red and green wires).
4. Bypass the carbon button on each telephone microphone for RF using a ceramic condenser supplied with the Patch.
For initial null adjustment:
1. Set the switch to MIKE, turn the RCVR OUTPUT control counter-clockwise, and set the NULL LINE to the center.
2. Tune a signal on the receiver and adjust the speaker level for normal listening.
3. Call someone to set up normal operating conditions.
4. Switch to PATCH and adjust the RCVR OUTPUT control for normal telephone listening level.
5. Use high impedance headphones to adjust the NULL LINE control for minimum receiver signal.
6. Connect the cable between the XMTR jack and transmitter microphone input to complete setup.
For MIKE operation, the phone line is disconnected, and the microphone connects directly to the transmitter. If using an audio band pass filter, place it at the MIKE input of the High Patch.
For PATCH operation:
1. Call the party on the phone, then switch to PATCH.
2. Adjust the XMTR INPUT gain control for the proper level to the transmitter.
3. Adjust the NULL LINE control to prevent the receiver signal from tripping the transmitter.
4. Adjust the RCVR OUTPUT control for normal telephone level.
5. Internal switching disables the speaker when patching to avoid feedback.
Users are advised not to tie up party lines, accept commercial calls for patching, cause cross-talk, install unauthorized telephone extensions, or leave the Patch connected when not in use.
Troubleshooting & Error Codes
Refer to the PDF for details.
Safety & Warnings
Refer to the PDF for details.
Download MANUAL Service manual (PDF – 693.6 KB)
Service manual for Drake-highpatch-operation-service MANUAL. Aids technicians in troubleshooting and calibrating equipment. File size: 693.6 KB.
- Brand: Drake-highpatch-operation-service
- Model: MANUAL
- Type: Service manual
- File size: 693.6 KB
Overview
Brief overview of the product.
Specifications
- Key spec 1
- Key spec 2
Controls & Indicators
Control panel/button layout.
Installation / Setup
- Step 1…
- Step 2…
Operation
Basic usage, modes, cycles.
Troubleshooting & Error Codes
| Issue / Code | Fix |
|---|---|
| Example | How to fix… |
Safety & Warnings
- Important warning…
Downloads
Download MANUAL service manual (PDF)
Drake-highpatch-operation-service MANUAL Overview
The Drake-highpatch-operation-service MANUAL is a comprehensive service manual designed to provide detailed instructions and technical information for the Drake-highpatch-operation-service equipment. This manual is essential for technicians and operators who need to understand the operation, maintenance, and troubleshooting of the device to ensure optimal performance and longevity.
Main Features and Specifications
- Detailed operational guidelines for efficient device use
- Step-by-step maintenance procedures to extend equipment life
- Comprehensive troubleshooting section to quickly identify and resolve issues
- Clear diagrams and technical illustrations for easy understanding
- Specifications including power requirements, operational limits, and component details
- Safety protocols and handling instructions to prevent accidents
Basic Usage and Operation Tips
Before operating the Drake-highpatch device, ensure all connections are secure and power supply matches the specified requirements. Follow the startup sequence outlined in the manual to avoid damage. Regularly monitor the device’s performance indicators and adhere to recommended operating conditions. Use only approved accessories and replacement parts to maintain device integrity.
Troubleshooting and Maintenance Notes
If the device exhibits irregular behavior or performance drops, refer to the troubleshooting section for common issues such as power interruptions, component malfunctions, or calibration errors. Routine maintenance includes cleaning filters, inspecting wiring, and verifying software updates if applicable. Always disconnect power before performing any maintenance tasks to ensure safety.
Safety Reminder
Always follow the safety instructions provided in the manual. Wear appropriate personal protective equipment when servicing the device. Avoid exposing the equipment to moisture or extreme temperatures. Improper handling can lead to injury or equipment damage. Keep the manual accessible for quick reference during operation and maintenance.