30 Jul
2012
30 Jul
'12
4:37 a.m.
Hi Andrey,
Parts arrived yesterday and I made modifications for the 100 kHz loop
filter and tested today. The entire 900 band is below 1.5 / 5 with a
good margin.
http://filebox.vt.edu/users/ttsou/http/umtrx_945mhz_4.bmp
The lower part of the 1800 is also below the target value. I was not
successful at 1885 MHz, though further calibration is possible (manual
calibration at each frequency takes a very long time). I will perform
additional tests tomorrow.
http://filebox.vt.edu/users/ttsou/http/umtrx_1825mhz_4.bmp
http://filebox.vt.edu/users/ttsou/http/umtrx_1825mhz_noise.PNG
Thomas
On Wed, Jul 25, 2012 at 9:52 PM, Thomas Tsou <ttsou(a)vt.edu> wrote:
On Wed, Jul 25, 2012 at 1:41 PM, Andrey Sviyazov
<andrey.sviyazov(a)fairwaves.ru> wrote:
Hi Thomas.
Digikey part numbers links:
C82 = 100pF, C83=1500pF, C84=33pF, R106=2.2k, R109=3.3k, L6=0.022uF.
But you'll remove 100pF capasitor from position C45, so you could use it for
C82.
BTW, how long time required to delivering from the DigiKey?
Thank you for the links. Parts are ordered. Digikey orders usually
arrives in 2 days.
Thomas