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Hi, I just buy this crystal
https://www.digikey.it/product-search/it?keywords=se3327
I try measure this with my VNWA (in series) Tx port - crystal - Rx port .
But I don't see the resonant frequency! , the RX port is costant to -80dbm
Why , because the ESR is too high?
With ESR high is...
Send Capture image of signal:
The condition are:
-antenna ferrite with classic fet preap in balcony 2 meters above ground
-the pc (is on, for measuere signal) and my lab is to a distance of ~3 meters
Hi, I want receive dcf77 at 77.5Khz
But at 79Khz I have strong signal noise. I need a band pass filter of bandwith 100Hz max.
I think to use the classic circuit preamp with cascade jfet and in the drain the LC resonant circuit (L with troid toroids.info/T50-3.php ) .
example this circuit...
I have a strange problem of sim900. When sending this command "AT+CSPN"
I receive this response:
strange because, the SIM900 is attached to the network and sends text messages and calls correctly !
Why?
I have this version; "Revision: 1137B02SIM900M64_ST_ENHANCE"
I inizialize the sim900 in...
In the datasheet there is a description of alarm command clearly!!!!!!!!!!!
example
AT+CALA="13/01/15,14:16:00",1,"0"
+CME ERROR: 3
ok?
not work , I try all possible string but NOT WORK!!!!
AT+CALA="13/01/15,14:16:00",1,0
+CME ERROR: 25
not work!!
WHY???
Hi all,
I have this signal in out of SA615:
The amplitude is non costant at varius frequency :
f(Hz) V
150 0,638
300 0,5812
450 0,5063
600 0,45
750 0,3875
900 0,3438
1050 0,3
1200 0,2719
1350 0,2469
1500 0,225
1650 0,2094
1800 0,1906
1950 0,1859
2100 0,1703
2250 0,1656
2400 0,1531
2550...
Re: 2N5109 and p1db ????
In fact I have a low gain, but if I insert in input 10dBm and NOT 21dbm I have 22dbm in out +12dbm of gain.
Therefore the input of 21dBm is too large for this transistor? because I have only 6-7dbm of gain
my experiment is video/audio modulator for tv 224.5 Mhz
my demo...
Hi, I have a doubt, the classic connection of the mixer is as shown in figure:
I know C3 = 100nF impedence ~0 ohm
In the datasheet there is write the impedence of single pin input (1 and 2) is 4700 ohm.
I have a impedence in input is 50 ohm.
My question is: If the pin 2 with impedence is 4700...
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