Summary of Contents for Heros VLF-LF-MF
- Page 1 VLF-LF-MF Up Converter 3.5MHz-4MHz model 350 5kHz-500kHz 4MHz-4.5MHz model 400 User manual. Rev 2018-01 © HEROS technology Limited 2002. All rights reserved...
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Page 2: Specifications
- IF rejection: 110dB typical. - MW band rejection: 80dB - Crystal oscillator: Low phase noise; quartz crystal; 3.5MHz or 4MHz, fundamental. - Power: 12volts/40mA - Enclosure: Aluminium - Size: 125mmx105mx55mm ( 4.921x4.133x2.165in) © HEROS technology Limited 2002. All rights reserved... - Page 3 Crystal Oscillator 3,5MHz or 4MHz Local oscillator section Drawing 5kHz-500kHz VLF LF Up- Converter Approvals Size DWG No Sheet Issued 2016-02 Scale FCSM No Checked Drawn Date I I MMXV JJ de Oñate © HEROS technology Limited 2002. All rights reserved...
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Page 5: Input Filters
Next, a Band Pass filter at IF frequency connects to a Low Noise Amplifier to compensate losses, delivering around 5dB of gain to the output, necessary to overcome losses from external cable tails, relays and connectors. © HEROS technology Limited 2002. All rights reserved... - Page 6 VLF LF <5KHz - 500KHz Up Converter Basic connection to a SW receiver 50Ω Antenna Earth Optional step attenuator Antenna Input RF IF Output DC 12V/40mA RX antenna input Generic SW receiver 4.100MHz © HEROS technology Limited 2002. All rights reserved...
- Page 7 Port C RF Output Port R (100W PP max.) Receiver antenna 4.100MHz Heros Technology HF Dual By-Pass relay. Reception state (relay no activated) - Ports A-B connected - Ports C-R connected * Transmission state (relay activated) - Port A connected to Port R Delayed Transmission/Reception switch over command line.
- Page 8 VLF LF <5KHz - 500KHz Up Converter Connection to FlexRadios Flex 5000 RX1 IN Configure Antenna Selection form according with your cabling. XVRX Antenna input IF output PowerSDR Antenna Selection form Flex 15000 Flex 1500 XVRX XVRX © HEROS technology Limited 2002. All rights reserved...
- Page 9 (0 KHz in the picture) Local oscillator correction (if any) Dial upper frequency Local oscillator offset: (500 KHz in the picture) Negative value (-) - 3.5 for Converter model 350 - 4 for Converter model 400 © HEROS technology Limited 2002. All rights reserved...
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Page 10: Oscillator Calibration
The VLF-LF Up-converter comes calibrated from factory after a burn test of 24 hours. If for any reason you need to recalibrate the local oscillator proceed as follows: Remove the four front panel screws and slide gently the lid. You may untie the two upper screws on rear panel. © HEROS technology Limited 2002. All rights reserved... - Page 11 VLF LF <5KHz - 500KHz Up Converter Remove the lid from the local oscillator section. Switch ON the converter. Allow at least 30 minutes of warming time before adjusting at room temperature. Adjusting trimmer Measuremet point © HEROS technology Limited 2002. All rights reserved...
- Page 12 Switch ON Drawing 5kHz-500kHz VLF LF Up- Converter 680Ω 100n Approvals Size DWG No Sheet Issued 2018-01 Font panel module Scale FCSM No Checked Drawn Date I I MMXV JJ de Oñate © HEROS technology Limited 2002. All rights reserved...
- Page 13 Heros technology Limited makes no representations or warranties of any kind whether express or implied, written or oral, statutory or otherwise, related to the information, including but not limited to its condition, quality, performance, merchantability or fitness for purpose.
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