Hammarlund HQ 129X
Description: A transmitter, a dow key, and a Hammarlund HQ-129X with a send/receive switch on the front panel are being utilized for AM transmission. The manual switching of the receiver has become cumbersome, as the dow key is activated with the transmitter. Upon reviewing the schematics, it has been observed that there is current present on the relay output located at the back of the receiver when the front panel switch is in the receive position.
To enhance the functionality of the described setup, a more automated switching mechanism could be implemented. This could involve integrating an electronic switching system that responds to the operational state of the transmitter. By utilizing a relay or a solid-state switch, the current detected at the relay output could be used to automatically toggle the send/receive switch on the Hammarlund HQ-129X.
The proposed circuit would consist of a control relay that activates when the transmitter is engaged. This relay would be connected to the send/receive switch, allowing it to switch to the transmit position automatically. When the transmitter is turned off, the relay would return the switch to the receive position.
To ensure compatibility and reliability, it is crucial to select a relay with appropriate voltage and current ratings that match the specifications of the Hammarlund HQ-129X. Additionally, the circuit should include protective components such as diodes to prevent back EMF from damaging the control circuit when the relay is de-energized.
In summary, the integration of an automatic switching mechanism would alleviate the manual effort currently required for the send/receive operation, enhancing the overall efficiency and user experience of the AM transmission setup.Hello, I have been doing AM thing with a Transmitter, a dow key, # and a Hammarlund HQ-129X with a send receive switch on the front pannel. The manual send/receive switching of the receiver has become quite tiring since the dow key is being switched with the transmitter.
After looking at the schematics and determining there is current on the relay output on the back of the receiver. With the front pannel switch in the receive position..
To enhance the functionality of the described setup, a more automated switching mechanism could be implemented. This could involve integrating an electronic switching system that responds to the operational state of the transmitter. By utilizing a relay or a solid-state switch, the current detected at the relay output could be used to automatically toggle the send/receive switch on the Hammarlund HQ-129X.
The proposed circuit would consist of a control relay that activates when the transmitter is engaged. This relay would be connected to the send/receive switch, allowing it to switch to the transmit position automatically. When the transmitter is turned off, the relay would return the switch to the receive position.
To ensure compatibility and reliability, it is crucial to select a relay with appropriate voltage and current ratings that match the specifications of the Hammarlund HQ-129X. Additionally, the circuit should include protective components such as diodes to prevent back EMF from damaging the control circuit when the relay is de-energized.
In summary, the integration of an automatic switching mechanism would alleviate the manual effort currently required for the send/receive operation, enhancing the overall efficiency and user experience of the AM transmission setup.Hello, I have been doing AM thing with a Transmitter, a dow key, # and a Hammarlund HQ-129X with a send receive switch on the front pannel. The manual send/receive switching of the receiver has become quite tiring since the dow key is being switched with the transmitter.
After looking at the schematics and determining there is current on the relay output on the back of the receiver. With the front pannel switch in the receive position..
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