ինչպես կարգավորել LO հաճախականությունը՝ IF ​​ելքային հաճախականությունը վերահսկելու համար

ՀՏՀ: Can the LO frequency of the downconverter be modified (Է.Գ., -ից 1750 ՄՀց դեպի 875 MHz կամ 750 MHz)?

Q: Բարեւ, can the down converters we bought from you be modified to cut the LO frequency in half? They currently operate at 1750 MHz—can they work around 875 MHz or be set to 750 MHz?

A: այո, the LO (Տեղական օսցիլյատոր) frequency can be modified. սակայն, we strongly recommend that the modification be carried out by our engineers, or that you return the unit to us for adjustment to ensure optimal performance and stability.

If you prefer to modify it yourself, it is also possible by following the procedure below.

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🔧 Self-Modification Guide

1. Սարքավորումների տեղադրում

• Open the metal enclosure of the FDC (Հաճախականության իջեցման փոխարկիչ).
• Connect the device to your computer using a USB-to-TTL adapter.

Wiring (3 connections only):

• TX → RX
• RX → TX
• GND → GND

You may also make the cable yourself if needed.

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2. Software Control via Serial Port

Use a serial terminal tool to send commands to the module.

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3. Check Current Status

Հրաման:

check?

նկարագրություն:

• Returns the current operating status and detected frequency values.

Կարևոր:

• The command must end with a question mark (?), otherwise it will be invalid.

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4. Modify LO Frequency

You can adjust the LO frequency by sending the following commands:

Target_FRE1=XXXX;
Target_FRE2=XXXX;
Target_FRE3=XXXX;

բացատրություն:

• XXXX = desired frequency value (միավոր: MHz)
• Each command corresponds to a specific LO module (LE1 / LE2 / LE3)
• The system will automatically relock to the new frequency after setting

Օրինակներ:

• Set LO to 875 MHz:

Target_FRE1=875;

• Set LO to 750 MHz:

Target_FRE1=750;

Կարևոր:

• Each command must end with a semicolon (;), otherwise it will be invalid.

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⚠️ Important Notes

• Ensure the target LO frequency is within the supported operating range of the hardware.
• Changing the LO may affect IF output frequency and system performance.
• Improper configuration may lead to signal instability or loss of lock.

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✅ Recommendation

For best results and to avoid potential issues, խորհուրդ ենք տալիս:

• Contacting our engineering team for guidance, կամ
• Returning the unit to us for professional modification and calibration

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If you have any questions or need the configuration software, feel free to contact us.