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Pico SWR
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Author:  alfian [ 01 May 2020, 04:53 ]
Post subject:  Pico SWR

How to calibrate Pico SWR?

Author:  Relayer [ 01 May 2020, 10:09 ]
Post subject:  Re: Антенный анализатор Pico SWR

1. Connect Pico SWR to computer, run software, select com-port and press open
2. Press "Calibration" button
3. Select "XTal frequency" tab. If you have frequency meter - connect it to Pico SWR out and measure frequency. If you haven't it - use crystal frequency. Enter frequency value in Hz. Press "Ok"
4. Select "Detector slope" tab. Disconnect load and press "Run". After calibration done press "Save"

Author:  alfian [ 01 May 2020, 10:30 ]
Post subject:  Re: Антенный анализатор Pico SWR

that's very helpful. I will try to fix. thank you
I'm still confused with T1. how to make it ... is it enough with the toroid wrapped around the cable

Author:  Relayer [ 01 May 2020, 11:11 ]
Post subject:  Re: Антенный анализатор Pico SWR

Use next construction

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Up wires to bridge R1R8R9, bottom - to ground and C17

Author:  alfian [ 01 May 2020, 16:52 ]
Post subject:  Re: Антенный анализатор Pico SWR

This construction that I made

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Author:  Relayer [ 01 May 2020, 16:58 ]
Post subject:  Re: Антенный анализатор Pico SWR

Yes, it's ok. Don't mismatch wire connection and all working as expected

Author:  alfian [ 01 May 2020, 17:05 ]
Post subject:  Re: Антенный анализатор Pico SWR

Results from circuit measurements. Not flat SWR 1: 1. whereas at the output output of 50 ohms. Statistik freq1,000,000-end 200,000,000, does this work well ...?

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Author:  Relayer [ 01 May 2020, 18:07 ]
Post subject:  Re: Антенный анализатор Pico SWR

Are your sure about 50R load? My 50R load - two smd 100R in parellel in SMA socket

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Can you check voltage at BF998 drain? It must be in range 2.2v..2.8v
If you have thin 50R coaxial cable 2mm diameter try to make T1 from it.

Author:  alfian [ 02 May 2020, 15:49 ]
Post subject:  Re: Антенный анализатор Pico SWR

load 50R. but my TR 1 uses bf980 ... does this cause different results. because TR 1 is rare

Author:  Relayer [ 02 May 2020, 21:28 ]
Post subject:  Re: Антенный анализатор Pico SWR

BF998 is very cheap transistor widely available. I haven't experience with BF980, but I think that all must be working same as with BF998. Anyway you need check voltage at drain - it must be in range 2.2v..2.8v.

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