Hi,
I've received 10pcs of OHM4048052GG010020-26.0M today. Andrey Sviyazov - could you measure their performance and test UmTRX with them?
That's good news! Yes, of course, I have to test it and then share some results.
Best regards, Andrey Sviyazov.
2012/7/31 Alexander Chemeris alexander.chemeris@gmail.com
Hi,
I've received 10pcs of OHM4048052GG010020-26.0M today. Andrey Sviyazov
- could you measure their performance and test UmTRX with them?
-- Regards, Alexander Chemeris. CEO, Fairwaves LLC / ООО УмРадио http://fairwaves.ru
Hi.
Here LMS TxLO noise plot for OHM4048V-26MHz OCXO.
Best regards, Andrey Sviyazov.
2012/7/31 Andrey Sviyazov andreysviyaz@gmail.com
That's good news! Yes, of course, I have to test it and then share some results.
Best regards, Andrey Sviyazov.
2012/7/31 Alexander Chemeris alexander.chemeris@gmail.com
Hi,
I've received 10pcs of OHM4048052GG010020-26.0M today. Andrey Sviyazov
- could you measure their performance and test UmTRX with them?
-- Regards, Alexander Chemeris. CEO, Fairwaves LLC / ООО УмРадио http://fairwaves.ru
So, looks like it has a bit worse far-end noise, but otherwise is about the same as TCXO we use now, correct?
Btw, was it UmTRX layout incorrect or the OCXO pinout?
On Fri, Aug 3, 2012 at 3:42 PM, Andrey Sviyazov andreysviyaz@gmail.com wrote:
Hi.
Here LMS TxLO noise plot for OHM4048V-26MHz OCXO.
Best regards, Andrey Sviyazov.
2012/7/31 Andrey Sviyazov andreysviyaz@gmail.com
That's good news! Yes, of course, I have to test it and then share some results.
Best regards, Andrey Sviyazov.
2012/7/31 Alexander Chemeris alexander.chemeris@gmail.com
Hi,
I've received 10pcs of OHM4048052GG010020-26.0M today. Andrey Sviyazov
- could you measure their performance and test UmTRX with them?
-- Regards, Alexander Chemeris. CEO, Fairwaves LLC / ООО УмРадио http://fairwaves.ru
1/ Yes, my fears were confirmed - OHM4 footprint isn't correct (my mistake), but it possible to mount from bottom side. 2/ Noise plots are similar, I think we see limit of LMS performance but not XO (see pictures here).
Also, I found that for 1850MHz better to use Icp=1.2mA. Therefore I decide to measure at 1.2mA for both frequencies just to compare. If Icp dependance of frequency confirmed, then we need lookup table for this also.
Best regards, Andrey Sviyazov.
2012/8/3 Alexander Chemeris alexander.chemeris@gmail.com
So, looks like it has a bit worse far-end noise, but otherwise is about the same as TCXO we use now, correct?
Btw, was it UmTRX layout incorrect or the OCXO pinout?
On Fri, Aug 3, 2012 at 3:42 PM, Andrey Sviyazov andreysviyaz@gmail.com wrote:
Hi.
Here LMS TxLO noise plot for OHM4048V-26MHz OCXO.
Best regards, Andrey Sviyazov.
2012/7/31 Andrey Sviyazov andreysviyaz@gmail.com
That's good news! Yes, of course, I have to test it and then share some results.
Best regards, Andrey Sviyazov.
2012/7/31 Alexander Chemeris alexander.chemeris@gmail.com
Hi,
I've received 10pcs of OHM4048052GG010020-26.0M today. Andrey Sviyazov
- could you measure their performance and test UmTRX with them?
-- Regards, Alexander Chemeris. CEO, Fairwaves LLC / ООО УмРадио http://fairwaves.ru
-- Regards, Alexander Chemeris. CEO, Fairwaves LLC / ООО УмРадио http://fairwaves.ru
Actually, I don't have enough time to research of it more, because of preselector design in progress.
Best regards, Andrey Sviyazov.
2012/8/3 Andrey Sviyazov andreysviyaz@gmail.com
1/ Yes, my fears were confirmed - OHM4 footprint isn't correct (my mistake), but it possible to mount from bottom side. 2/ Noise plots are similar, I think we see limit of LMS performance but not XO (see pictures here).
Also, I found that for 1850MHz better to use Icp=1.2mA. Therefore I decide to measure at 1.2mA for both frequencies just to compare. If Icp dependance of frequency confirmed, then we need lookup table for this also.
Best regards, Andrey Sviyazov.
2012/8/3 Alexander Chemeris alexander.chemeris@gmail.com
So, looks like it has a bit worse far-end noise, but otherwise is about the same as TCXO we use now, correct?
Btw, was it UmTRX layout incorrect or the OCXO pinout?
On Fri, Aug 3, 2012 at 3:42 PM, Andrey Sviyazov andreysviyaz@gmail.com wrote:
Hi.
Here LMS TxLO noise plot for OHM4048V-26MHz OCXO.
Best regards, Andrey Sviyazov.
2012/7/31 Andrey Sviyazov andreysviyaz@gmail.com
That's good news! Yes, of course, I have to test it and then share some results.
Best regards, Andrey Sviyazov.
2012/7/31 Alexander Chemeris alexander.chemeris@gmail.com
Hi,
I've received 10pcs of OHM4048052GG010020-26.0M today. Andrey Sviyazov
- could you measure their performance and test UmTRX with them?
-- Regards, Alexander Chemeris. CEO, Fairwaves LLC / ООО УмРадио http://fairwaves.ru
-- Regards, Alexander Chemeris. CEO, Fairwaves LLC / ООО УмРадио http://fairwaves.ru
On Fri, Aug 3, 2012 at 5:29 PM, Andrey Sviyazov andreysviyaz@gmail.com wrote:
1/ Yes, my fears were confirmed - OHM4 footprint isn't correct (my mistake), but it possible to mount from bottom side.
Ok. Please document this to the tracker. We'll fix it when we make the second generation of PCB.
Hi Andrey,
Yes, the best value of Icp will vary with frequency as Kvco is changing. Hence, we have option to make look up table or to deign dedicated loop filters for the bands of interest. There are no too many bands according to Alexander's email, only 4 (effectively 2). Look up table may be more flexible solution as you do need to change BOM i.e. hardware platform stays the same.
Best regards, Srdjan
On 03/08/2012 14:29, Andrey Sviyazov wrote:
1/ Yes, my fears were confirmed - OHM4 footprint isn't correct (my mistake), but it possible to mount from bottom side. 2/ Noise plots are similar, I think we see limit of LMS performance but not XO (see pictures here).
Also, I found that for 1850MHz better to use Icp=1.2mA. Therefore I decide to measure at 1.2mA for both frequencies just to compare. If Icp dependance of frequency confirmed, then we need lookup table for this also.
Best regards, Andrey Sviyazov.
2012/8/3 Alexander Chemeris <alexander.chemeris@gmail.com mailto:alexander.chemeris@gmail.com>
So, looks like it has a bit worse far-end noise, but otherwise is about the same as TCXO we use now, correct? Btw, was it UmTRX layout incorrect or the OCXO pinout? On Fri, Aug 3, 2012 at 3:42 PM, Andrey Sviyazov <andreysviyaz@gmail.com <mailto:andreysviyaz@gmail.com>> wrote: > Hi. > > Here LMS TxLO noise plot for OHM4048V-26MHz OCXO. > > Best regards, > Andrey Sviyazov. > > > > 2012/7/31 Andrey Sviyazov <andreysviyaz@gmail.com <mailto:andreysviyaz@gmail.com>> >> >> That's good news! >> Yes, of course, I have to test it and then share some results. >> >> Best regards, >> Andrey Sviyazov. >> >> >> >> 2012/7/31 Alexander Chemeris <alexander.chemeris@gmail.com <mailto:alexander.chemeris@gmail.com>> >>> >>> Hi, >>> >>> I've received 10pcs of OHM4048052GG010020-26.0M today. Andrey Sviyazov >>> - could you measure their performance and test UmTRX with them? >>> >>> -- >>> Regards, >>> Alexander Chemeris. >>> CEO, Fairwaves LLC / ООО УмРадио >>> http://fairwaves.ru >>> >> > -- Regards, Alexander Chemeris. CEO, Fairwaves LLC / ООО УмРадио http://fairwaves.ru
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Alexander Chemeris -
Andrey Sviyazov -
Srdjan Milenkovic