Where can I buy a TCXO

Hi,

I recently purchased https://www.ebay.com/itm/332389156868

This is an OCXO, so it is with an oven. It takes 90 seconds to stabilize (and the casing gets warm as the oven heats up).

I got these as frequency reference for by QO100 setup if GPS isn't available or if I want to test something quick - GPSDO takes more time to synchonize.

Mind you, this thing does 10 MHz, not 40. But if stability is an issue - give it a spin!

73,

Geert Jan PE1HZG

Quote from pe1hzg

Hi,

I recently purchased https://www.ebay.com/itm/332389156868

This is an OCXO, so it is with an oven. It takes 90 seconds to stabilize (and the casing gets warm as the oven heats up).

I got these as frequency reference for by QO100 setup if GPS isn't available or if I want to test something quick - GPSDO takes more time to synchonize.

Mind you, this thing does 10 MHz, not 40. But if stability is an issue - give it a spin!

73,

Geert Jan PE1HZG

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In order to have as good accuracy as possible, a R trimmer must be used to set it exactly at 10 MHz. The R trimmer must be a multi turn one and be powered from a very good (without noise) source that provides 4-5 V. I want to make such a no GPSDO module and I plan to use an existing 4.096 V reference.

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

Hi André,

I bought this one, which has also a 40 MHz output:

https://de.aliexpress.com/item…3.detail.3.56cd51b4OiqIxZ

There is one at eBay too.

Detlev

I got one at hamshop.cz and they responded within a week, Did this modification, the pluto adalm survived my mediocre soldering techniques.

Hi Detlev,

Did you get the OCXO from AliExpress? How did it perform?

Syed

AP2AM

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

Hi Detlev,

Thanks for sharing the experience. I was about to order this one but phase noise problem worried me. Will decide after getting some user reports. For reception locking to middle beacon solved the drift but for TX pluto drift is unacceptable. The Abracon TCXO is no more available with Mouser or Digikey. Leobodner refused to ship his GPSDO to AP Land. After making about 300 QSOs I have stopped using pluto till I find a stablizing source.

73

Syed

AP2AM

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

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

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

Quote from DC7KG

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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Thanks @DC7KG  Detlev.

Very interesting.

73!

PY1SAN

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

Quote from DC7KG

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

Hi @DC7KG  Detlev.

I haven't experienced with 40 MHz OCXO. I use the ENE3311B here. 10 MHZ output. I hope very successful for you.

73 !

PY1SAN

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

Hi Sandro,

I've just got the data sheet of the RTL203004. It is a TCXO with 3.3 V supply voltage.

73, Detlev

Quote from DC7KG

Hi Sandro,

I've just got the data sheet of the RTL203004. It is a TCXO with 3.3 V supply voltage.

73, Detlev

Very interesting.

73 !

Sandro RIbeiro

PY1SAN

Hi,

Any suggestions on using this TCXO by Epson (2x2.5 mm).

TG2520SMN 40.0000M-ECGNNM3

XTAL OSC TCXO 40MHZ CSW 1.8V

EPSON

73

Syed