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| Device under test |
Do It Yourself
Transverter
2.4GHz to 144MHz down converter.
This is the 2.4GHz to 144MHz down converter which is modify from a satellite TV down converter by Drake 2880. I used this converter for the AO-40 Phase 3D amateur satellite 2.4GHz down link receive. I modify this converter for more than 10pcs. The transvertion gain is around 26dB to 32dB during -100dBm RF signal input. The noise figure is also improve after insert the Mini-circuit MMIC. It works so fine for the readable data signal around S2 to S4 came out from my FT-817 during used a 16 turns homemade helix and S9 with a 1.8m dish by VR2XMT Charlie.
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| Device under test |
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| Inside view 1 |
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| Inside view 2 | Inside view 3 |
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| Ref. freq. mod. | IF filter expand |
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| RF filter mod. |
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| Add MMIC amplifier | External power mod. |
Specification and schematic
diagram for Mini-Circuits MMIC in JPG format ( size : 4.0MB )
Similar modification by
JN1GKZ
Specifications and Details before insert MMIC
| a) | Power gain | : | 2.4GHz Input | 144MHz Output | gain |
| -50dBm | -31.88dBm | 18.12dB | |||
| -60dBm | -41.78dBm | 18.22dB | |||
| -70dBm | -51.36dBm | 18.64dB | |||
| -80dBm | -60.45dBm | 19.55dB | |||
| -90dBm | -71.91dBm | 18.09dB | |||
| -100dBm | -81.83dBm | 18.17dB | |||
| -110dBm | -92.03dBm | 17.97dB | |||
| -115dBm | -96.81dBm | 18.19dB | |||
| -120dBm | -99.65dBm | 20.35dB | |||
| -125dBm | -102.2dBm | 22.80dB | |||
| b) | Noise Figure | : | 8dB | ||
| c) | Operating Frequency | : | 2400MHz to 2402MHz for 144MHz to 146MHz output. | ||
| d) | Operating Voltage | : | 13 to 24V DC | ||
| e) | Operating Current | : | less than 200mA for 13.8V DC | ||
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Specifications and Details after insert MMIC
| a) | Power gain | : | 2.4GHz Input | 144MHz Output | gain |
| -50dBm | -17.62dBm | 32.38dB | |||
| -60dBm | -27.55dBm | 32.45dB | |||
| -70dBm | -37.39dBm | 32.61dB | |||
| -80dBm | -47.36dBm | 32.62dB | |||
| -85dBm | -52.51dBm | 32.49dB | |||
| -90dBm | -57.35dBm | 32.65dB | |||
| -95dBm | -62.32dBm | 32.68dB | |||
| -100dBm | -67.26dBm | 32.74dB | |||
| -105dBm | -72.06dBm | 32.94dB | |||
| -110dBm | -76.89dBm | 33.11dB | |||
| -115dBm | -81.76dBm | 33.24dB | |||
| -120dBm | -86.32dBm | 33.68dB | |||
| -125dBm | -90.82dBm | 34.18dB | |||
| -130dBm | -94.98dBm | 35.02dB | |||
| -133dBm | -97.25dBm | 35.75dB | |||
| -135dBm | -98.90dBm | 36.10dB | |||
| b) | Noise Figure | : | Around 2dB to 3dB. | ||
| c) | Operating Frequency | : | 2400MHz to 2402MHz for 144MHz to 146MHz output. | ||
| d) | Operating Voltage | : | 13 to 24V DC | ||
| e) | Operating Current | : | less than 200mA for 13.8V DC | ||