Selectivity improvement solutions proposal for UmTRX

Andrey Sviyazov andreysviyaz at gmail.com
Mon Mar 19 21:20:52 UTC 2012


Thank you Robin for hint.
This is serious reason to use ADF.
I think that a bit possible 2..3dB difference in noises at 0.6MHz ofset
isn't big advantage.
Other hand, I see that HMC has twice lower VCO sensitivity and better
noises of dividers and than a seems a bit better.
So, I'll try to design both variants on time and then will see.

Best regards,
Andrey Sviyazov.



20 марта 2012 г. 0:49 пользователь Robin Coxe <coxe at close-haul.com> написал:

> **
> I haven't done a detailed comparison of the specs (I believe that they are
> similar). The one advantage of the ADF4350 is that there is already UHD
> support for it since this part is on the WBX and SBX Ettus daughtercards.
> ------------------------------
> *From: * Andrey Sviyazov <andreysviyaz at gmail.com>
> *Date: *Tue, 20 Mar 2012 00:45:35 +0400
> *To: *Robin Coxe<coxe at close-haul.com>
> *Cc: *Alexander Chemeris<alexander.chemeris at gmail.com>; Jean-Samuel
> Najnudel - BJT PARTNERS SARL<jsn at bjtpartners.com>; <
> gsm-internal at lists.fairwaves.ru>; Project Mayotte<
> project-mayotte at sysmocom.de>
> *Subject: *Re: Selectivity improvement solutions proposal for UmTRX
>
> Ok. Anyway, it will be much faster then request of samples from Moscow.
> Sorry regarding ADF4350 parameters, I mixed up it with ADF4360.
> What do you think about ADF4350 and HMC830 differences and usability?
>
> Andrey.
>
>
>
> 20 марта 2012 г. 0:14 пользователь Robin Coxe <coxe at close-haul.com>написал:
>
>> OK, I'll send the chips directly to Andrey.  The Hittite guy didn't say
>> exactly when he'd have the samples.  They usually insist on delivering them
>> in person and it may take a week or so before he shows up.
>>
>> 2012/3/19 Andrey Sviyazov <andreysviyaz at gmail.com>
>>
>>> Ok, no problem.
>>> My home address:
>>>
>>> Vilora Trifonova str., house 6, app. 45, Krasnogorsk сity, Moscow
>>> region, 143400, RUSSIA.
>>> Andrey Sviyazov.
>>> mobile: +7-916-828-7758.
>>>
>>>
>>>
>>> 19 марта 2012 г. 23:05 пользователь Alexander Chemeris <
>>> alexander.chemeris at gmail.com> написал:
>>>
>>> Andrey,
>>>>
>>>> 2012/3/19 Andrey Sviyazov <andreysviyaz at gmail.com>:
>>>> > Alexander, if you know faster way, let use it.
>>>> > Other hand, I need at least one week for RF-board design and 3-4 days
>>>> for
>>>> > PCB production and delivery to my office.
>>>> > So, there are two weeks for EMS.
>>>>
>>>> DHL will be faster. But then it's better to ship to your address, as I
>>>> will not be in Moscow the whole next week. Send you address to Robin,
>>>> plz.
>>>>
>>>> --
>>>> Regards,
>>>> Alexander Chemeris.
>>>> CEO, Fairwaves LLC / ООО УмРадио
>>>> http://fairwaves.ru
>>>>
>>>
>>>
>>
>>
>> --
>> Robin Coxe  |  Close-Haul Communications, Inc.  |  Boston, MA
>> +1-617-470-8825
>>
>
>
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