The Pluto can uses clock frequencies up to 320 MHz, you have to choose the right scaling factor to get near to 80 MHz, i.e 320 x 1/4. Pluto uses 40 x 2 = 80 and when you use 50 MHz, then you have to change the factor to 1. 50 x 1 = 50.
Posts by DC7KG
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Hi,
the Pluto uses 40 MHz x 2 = 80 MHz, you have to change the factor from 2 to 1, when you use 50 MHz.
Detlev
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Hi George,
you need a much higher time constant for the VCO:
Configuration for VCO range, time constant (4-32000s) and a lot of other parameter
Regards,
Detlev
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Hi,
the control loop is much too fast.
GPSDO producer say they reach the highest accuracy after 1 day of reception:
- High frequency accuracy (when tracked GNSS over 1 day)
<5e-11 at 1s
<2e-11 at 10s
<1e-11 at 100s
<5e-12 at 1,000s
<2e-12 at 10,000s
Detlev
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Hi George,
very interesting. Rohde & Schwarz says:This figure shows the proven MER measurement for a DVB-T signal that was mainly affected by unwanted modulator phase noise. The cause cannot be seen in the constellation diagram. The R&S®ETL can make the cause visible with a new unique measurement capability.
Best regards Detlev
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Hi George,
did you measure the phase noise? There is a toolkit by KE5FX: http://www.ke5fx.com/gpib/readme.htm
Regards Detlev
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Hello Pierre,
you find some information in the manual: https://shop.kuhne-electronic.…/?card=1879#_tab_content4
Best regards,
Detlev, DC7KG
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I have two Plutos, when both were working one, a Version B gave a lot more output on the same firmware as my version D. Maybe production tolerances, I do not know. Sometimes a basic pluto.dfu "fix" doesn't seem to flush all traces of previous firmware, at least that's my experience, a uboot-env.dfu is needed.
Hi,
how much is a lot more output?
Regards,
Detlev
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Hi,
here is a conversion table.
Detlev
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Hi Andreas,
do you use a 20 W amplifier or a 43 dBm amplifier?
Once I've used a 88 dBm amplifier on 1 000 kHz.
Detlev
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Hi Thomas,
I think we use mixed units of measurement: dB for amplification and attenuation and W for the power.
Detlev
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Hi,
you can use a directional coupler (eBay about € 15.-) and a crystal detector:
N-Typ HF-Koaxial-Richtkoppler, Weiblich, 200W, 800-2500 MHz, 5 DB ~ 40 DB, 50Ohm
Detlev
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Don't forget, Analog Devices produces also the Pluto.
PE1CMO's price list is in the brochure, but no address! Very strange. I had no problems getting my 20 W amplifier from René.
Detlev
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Hi Matthias,
my 20 W amplifier from PE1CMO is full duplex.
Detlev
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Hi there,
I miss the 1 W amplifier from AD CN0417 and the 20 W amplifier from PE1CMO.
73 Detlev
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Hi,
I don't know if SATSAGEN is a reliable analyzer. If you switch 10 dB in between, all lines must decrease by 10 dB.
I have to finish my clock generator and measure with a HP Spectrum Analyzer.
Detlev
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I suppose dxpatrol adjusts the capacitor for best swr
73 Detlev DC7KG
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Hi,
your order is ok. Wilhelm is right, the flap is a capacitor and must not touch the helix. Try to bend it back to the original position.
Good luck!
Detlev
