Posts by HG0NCL

Please, could you help me to understand why are there negative input dBm values?

Adalm plut outputs as I recall positive 5dBm. How can I match it with this -5 to -20 dBm range?

-5 starting point means 5dB insertion loss?

May interpret the table as it has been offsetted so -20 means 0 and -5 means +15 dBm?

How many dBms can I get out If I put Adalms 5 dBm in? or do I need at least 10 dBm attenuator to limit input to -5?

All PA specs I saw refers positive input numbers, that's why I'm lost

Thanks for the suggestions. I dont want to invest too much money for only one day measurement, so either I borrow one from a ham mate or I buy a dir.coupler !

73 DX Kornel

Quote from PA0P

Here is a very interesting addendum for your "big list".

A very well specified PA with 56dB gain and 20 Watt RF.

This is offered by BG0AUB who also has available an interface for

a Pluto driver.

Pricing is riduculous low. I ordered mine already 2 months ago.

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73 de Cor

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Hi,

What preamp do you use to drive this BG0AUB PA? How much gain needed? 4-5W Output should be enough for me with that 110cm dish I guess, so maybe I can run it with reduced input voltage and low drive or?
But, being as a newbie I'm simple unable to understand the spec table you shared the input power column with those negaitve dbm values

Hi Folks,

How can I fine tune QO100 Helix ? My SWR meter is limited to 525 Mhz, my nanoVNA-H4 goes only up to 1.5Ghz.
Is there any cheap trick or device available?

Thanks

Thanks for providing alternatives. But back to the original question: Would this Argtek work ?

is it only a PA or something more?

"Bi-directional, half-duplex, Auto-Switching via carrier sensing"

Hi,

Please, could you help me with this wifi booster I have? I found both 1W and 4W 'versions' on the internet

Would it work as QO100 PA with 110cm offset dish and helix ? (Hungary, Pluto+LNA)

vendor page

similar item wirh specs

Using non-optimal freq TCXO will cause drift or spurious signals on TX or what would be the practical effect?

Sorry for the newbie question.

Hi,

Here someone states this: " I was able to successfully swap to a 26 MHz 0.5ppm TCXO (leftover from a previous project) without any issue"

https://ez.analog.com/adieduca…-clock-to-the-adalm-pluto

"fw_setenv ad936x_custom_refclk "<26000000>""

He's also working with 25Mhz here: https://tbspace.de/plutosdrclockinput.html

Neither is a divider of 80 Mhz I believe

AD spec says this:

80 cannot be divided by 19 or 50

So I'm still feel that any value could work. Maybe I'm wrong but how can we make sure?

Hey Mates,

Please, could you confirm that the frequency extension "hack" still works also with Revision D?

73 DX

40MHz seems to be out of stock but 25Mhz, and some other variants are available. As I read the Pluto docs, internal clk sours can be any value between 19 and 50Mhz should work as long as adjust the actual freq in the boot config.

TG2520SMN TCXO

This seems to be a good candidate : https://hu.mouser.com/datashee…MN_en_1649545-1889946.pdf

Phase noise figures :https://www5.epsondevice.com/j…al_info/pdf/pb_m_tcxo.pdf

0.5ppm version available and the price is around 2 USD at digikey

What is your opinion?

Let me share that I found this alternative in a blog, but also out of stock: MURATA XNCLH40M000THJA1P0

Any other alternative do you aware of? I'd like to avoid buying a GPSDO...

Hi,

Please, could you suggest a good replacement TCXO chip which is available in EU e.g at digikey, mouser or any other shops?

Thanks

73 DX

Kornel