I'm going to have a look at the 2430A.
Current setup:
Tek 11402 Scope w/ 11A32 400MHz plugin
Tek P6121 10x probe - 1 meg termination in the scope
No bandwidth limiting
Adafruit si5351 board CLK2 terminated into 51 ohms.
Standalone Nano controlling it.
NOTE: CLK2 is also used for the following measurements.
There is a difference in output between 7.5MHz and 35.5MHz, but only about 15mv rms.
There's a bit of ringing on the square wave but that's probably in my setup.
Ok, with the above setup, at 11.020 MHz:
2ma setting: 190 mv rms.
4ma setting: 380 mv rms.
6ma setting: 560 mv rms.
8ma setting: 735 mv rms.
Vince.
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On 10/23/2017 01:50 PM, Vince Vielhaber wrote:
Nope, I don't bandwidth limit that scope (Tek 2430A). I'll do another
measurement tonite with the Tek 11402 and see what it says.
Vince.
Oh, and the si5351 is driving those series schottky diodes through a 6db
attenuator, which cuts the voltage in half.
Maybe you had your scope on some low bandwidth setting or something.
On Mon, Oct 23, 2017 at 10:44 am, Jerry Gaffke wrote:
If so, hard to imagine Farhan would get the ubitx to work at all, as his
first local oscillator is at 45mhz + signal
Apparently works up to a 30mhz signal frequency, so 75mhz from the
si5351.
And it has to drive something like 0.6v into two series schottky diodes
for them to start conducting.
--
Michigan VHF Corp.
