Hi Sandro,
I've just got the data sheet of the RTL203004. It is a TCXO with 3.3 V supply voltage.
73, Detlev
Posts by DC7KG
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Hi Sandro,
AD recommends 80 MHZ (2 x 40 MHz), but I don't know the influence of the frequency. Important is the quality of the transmitting signal, I think with a 40 MHz OCXO there will be no difference to the internal clock. When your signal is ok then you have no problems.
73, Detlev, DC7KG
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Hi Sandro,
I suppose you can't reach the recommended phase noise values with a clock multiplier. I am waiting for a 40 MHz OCXO (KVG RTL203004) from eBay.
73 Detlev, DC7KG
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Hi,
UG570 says:
The AD9361 Rx and Tx RFPLLs use the DCXO or external clock as their reference clock as well. For this reason, it is extremely critical that the crystal or clock source have very low phase noise. The recommended phase noise specification is shown in Figure 2.
73 Detlev
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Hi,
today I've used the OSC101 as external clock. It is completely useless. I transmitted on 2.4 GHz with the internal clock (image left) and with the OSC 101 as external clock (image right).
73 Detlev
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Hi Syed,
I bought another 40 MHz OCXO from Ebay, Aliexpress offers it too: RTL203004. I will try to compare both oscillators, but my spectrum analyzer seems to be too old for such measurements.
73 Detlev
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Hi Syed,
I've got the OCXO from Aliexpress, adjusted it to 40 MHz and tried to measure the phase noise, but didn't connect it to the Pluto yet. You need a 3 dB attenuator between OCXO and Pluto. Best regards,
Detlev
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Hi Ron,
that is the value for the 10MHz output!
Perhaps we can have a more exact measurement.
Best regards,
Detlev
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Hi Ron,
many thanks. That is nearly the same result as Karen has described in his article.
Best regards,
Detlev
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Hi,
has someone experience with the phase noise of the Leo Bodnar GPSDO at 25 and 40 MHz?
Best regards,
Detlev
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Hi Muhammad,
this module can deliver 40 MHz, you have to use "4X". The output level should be reduced with a 3dB attenuator.
Here you find the code for external clock: https://wiki.analog.com/university/tools/pluto/devs/booting
But when you intend to receive only, you can synchronize SDR console with the middle beacon. I use a LNB with crystal oscillator, not stabilized, and it works fine.
Best regards,
Detlev
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Hi Ernst,
which transceiver works on the AO-100 frequencies?
If your PC is not stable you should work on it.
73 Detlev
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Hi Chris,
you can use a VNA or a directional coupler to measure the SWR.
73 Detlev
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Hi André,
I bought this one, which has also a 40 MHz output:
https://de.aliexpress.com/item…3.detail.3.56cd51b4OiqIxZThere is one at eBay too.
Detlev
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AD recommends 40 MHz, I bought a 10 MHz OCXO with a second output of n x 10 MHz from Aliexpress, but didn' get it yet.
Detlev
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Hi Achim,
Phil has 10 W at the end of the antenna cable, a VSWR 2.7:1 and an 80 cm dish. That should be sufficient. Meanwhile he removed his 10 dB attenuator, so his power must have increased.
Detlev
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Hi,
I asked Hristiyan (SG Labs) about the mismatch. Here is the answer:
The amplifier is tested at VSWR >20 , 20W output power at all phase angles and it survives without damage and degradation.
Of course, it is not recommended to use it in this mode.
73 Hristiyan LZ5HP
Detlev
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Hi Phil,
I am using a homemade helix and 13 W in a 60 cm dish and can activate Leila.
Detlev
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Hi Phil,
then reduce your attenuator to 3 dB or remove it.
Detlev
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Hi Phil,
what is your forward power?
Detlev
