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Signal Generator Frequency Calibration

#ultra

Ed Wilson All Messages By This Member #8635 I would like to calibrate the output frequency for my new TinySA Ultra when in Signal Generator Mode. I am using an amateur radio Flex-6700 for a receiver which is disciplined to a GPSDO. The Flex-6700 has a panadapter which shows the output of the TinySA Ultra to be approximately 100 Hz high at a frequency of 145.0 MHz. I "think" that I see how to make frequency corrections in the Spectrum Analyzer Mode of the TinySA Ultra using the Expert menu, but I am not sure about making frequency corrections in the Signal Generator Mode. Any advice would be appreciated! -- Ed, K0KC ? k0kc@... http://k0kc.us/
Erik Kaashoek All Messages By This Member #8636 It will correct both input full range and output below 800Mhz and "highest accuracy mode" above 800Mhz in the same way. Cleanest signal mode above 800MHz is less frequency resolution. I need to update the wiki on this.... -- For more info on the tinySA go to https://tinysa.org/wiki/
hwalker All Messages By This Member #8637 On Wed, Dec 14, 2022 at 07:07 AM, Erik Kaashoek wrote: It will correct both input full range and output below 800Mhz and "highest accuracy mode" above 800Mhz in the same way. Cleanest signal mode above 800MHz is less frequency resolution. ? ?The tinySA Ultra has a minimum output frequency step-size of 44Hz as stated in the Wiki.? ?So, if for example, after frequency correction you are still 20Hz off you will not be able to get any closer because of the minimum output frequency step size. Above 800MHz, the minimum output frequency step-size is?much larger than 44Hz and the frequency correction does not apply to the "cleanest signal" RF output mode. ? The minimum output frequency step size is tied to the?ADF4350 and SI4468 chips used to generate the RF output.? Some frequency accuracy trade-off was necessary to meet the sub $150.00 USD price target.? I hope I got all the above correct. Herb
Ed Wilson All Messages By This Member #8638 Thanks, Erik! I was able to get the error down to about 9 Hz. -- Ed, K0KC ? k0kc@... http://k0kc.us/
hwalker All Messages By This Member #8640 On Wed, Dec 14, 2022 at 08:13 AM, Ed Wilson wrote: Thanks, Erik! I was able to get the error down to about 9 Hz. ? The frequency correction setting is lost after each firmware update.? You can save yourself some time by writing down the CONFIG->MORE->EXPERT CONFIG->FREQ CORR value that got your error down to 9Hz and re-entering it after each firmware update.? ? The long-term stability of the tinySA Ultra's main clock has been very good after frequency correction on my devices.? That clock is used for both input and output frequency accuracy, which is why a single correction routine works for both modes. Herb
davebb123456 All Messages By This Member #8642 Hi I have been reading this as I have just ordered the ultra yesterday, Can you tell me what frequency does the main clock oscillator run at, Thanks Dave 2E0DMB toggle quoted message Show quoted text On Wed, 14 Dec 2022, 17:25 hwalker, <herbwalker2476@...> wrote: On Wed, Dec 14, 2022 at 08:13 AM, Ed Wilson wrote: Thanks, Erik! I was able to get the error down to about 9 Hz. ? The frequency correction setting is lost after each firmware update.? You can save yourself some time by writing down the CONFIG->MORE->EXPERT CONFIG->FREQ CORR value that got your error down to 9Hz and re-entering it after each firmware update.? ? The long-term stability of the tinySA Ultra's main clock has been very good after frequency correction on my devices.? That clock is used for both input and output frequency accuracy, which is why a single correction routine works for both modes. Herb
Wes Stewart All Messages By This Member #8644 I got within 4 Hz at 100 MHz.? Now, how do I calibrate the amplitude? Wes? N7WS
Erik Kaashoek All Messages By This Member #8646 Search for the level correction menu in the wiki -- For more info on the tinySA go to https://tinysa.org/wiki/
Erik Kaashoek All Messages By This Member #8647 30MHz TCXO -- For more info on the tinySA go to https://tinysa.org/wiki/
davebb123456 All Messages By This Member #8648 Ok thanks Erik I can not wait until this ultra arrives,? as my spec an in my HP test set has only got a span of 10mhz, it does go up to 1ghz,? Thanks Dave 2E0DMB toggle quoted message Show quoted text On Wed, 14 Dec 2022, 20:03 Erik Kaashoek, <erik@...> wrote: 30MHz TCXO -- For more info on the tinySA go to
hwalker All Messages By This Member #8649 On Wed, Dec 14, 2022 at 11:19 AM, davebb123456 wrote: Hi I have been reading this as I have just ordered the ultra yesterday, Can you tell me what frequency does the main clock oscillator run at, The hardware design for the tinySA Ultra is not open source so I really can't say.? Suffice to know that the CAL output derives from the main clock source, so by monitoring it while using Eriks frequency correction procedure you are adjusting the main source. Herb
davebb123456 All Messages By This Member #8650 Thanks Herb Erik has kindly told me Thanks Dave? toggle quoted message Show quoted text On Wed, 14 Dec 2022, 20:12 hwalker, <herbwalker2476@...> wrote: On Wed, Dec 14, 2022 at 11:19 AM, davebb123456 wrote: Hi I have been reading this as I have just ordered the ultra yesterday, Can you tell me what frequency does the main clock oscillator run at, The hardware design for the tinySA Ultra is not open source so I really can't say.? Suffice to know that the CAL output derives from the main clock source, so by monitoring it while using Eriks frequency correction procedure you are adjusting the main source. Herb
Ed Wilson All Messages By This Member #8658 Herb, Thank you for the "heads-up" regarding loss of the correction factor when a firmware update is executed. Ed, K0KC k0kc@... http://k0kc.us/ -- Ed, K0KC ? k0kc@... http://k0kc.us/
Wes Stewart All Messages By This Member #8668 Thanks.? I saw Level Cal but clearly different.

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