Copyright: 1996 - 2024
BSEE - KB3UON
RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling
2 MB. Its primary purpose was to provide me with ready access to commonly needed
formulas and reference material while performing my work as an RF system and circuit
design engineer. The World Wide Web (Internet) was largely an unknown entity at
the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps
while tying up your telephone line, and a nice lady's voice announced "You've Got
Mail" when a new message arrived...
All trademarks, copyrights, patents, and other rights of ownership to images
and text used on the RF Cafe website are hereby acknowledged.
My Hobby Website:
signals in phase - RF Cafe Forums
RF Cafe Forums closed its virtual doors in 2012 mainly due to other social media
platforms dominating public commenting venues. RF Cafe Forums began sometime around
August of 2003 and was quite well-attended for many years. By 2010, Facebook and
Twitter were overwhelmingly dominating online personal interaction, and RF Cafe
Forums activity dropped off precipitously. If the folks at
phpBB would release a version with integrated
sign-in from the major social media platforms, I would resurrect the RF Cafe Forums,
but until then it is probably not worth the effort. Regardless, there are still
lots of great posts in the archive that ware worth looking at.
Below are the old forum threads, including responses to the original posts.
|-- Amateur Radio
Gripes & Humor
-- CAE, CAD, &
Test & Measurement
Post subject: signals in phase
Unread post Posted:
Fri Feb 11, 2005 6:39 am
Feb 11, 2005 6:32 am
I have a question:
I have two signal generators. I´d like to make two signals 1900MHz with
a phase between them. In the generators there is a option where you
can chenge the starting phase. If I put this two signals made in a power
combiner in your opinion they will be stable in phase. I mean the different
phase between them will be always the same. Of course they are syncronized
Thanks in advance, wallace0075
Unread postPosted: Fri Feb 11, 2005 9:00
The two signals will maintante the same phase difference
+ the phase error of the splitter. But you can calibrate out the phase
error by adjusting the phase of one of the signals to compensate for
the phase error of the combiner.
Post subject: Phase shift
Unread postPosted: Sat Feb 12, 2005
Just because 2 signals are at the same
frequency doesn't mean that the phase shift between them can't vary.
Noise in one generator that isn't in the other will show up as a phase
shift between the two.
To put it another way: in a phase-locked-loop,
the phase error is the signal that provides the feecback which tunes
the VCO. So unless the generators use a 3rd order loop, there will be
a phase error in each generator, which will change with temperature,
So you absolutely *MUST* verify that your generators
will do what you want.
Unread postPosted: Mon Feb 14, 2005 10:40
I thought what wallace was trying to achieve here was to
have to signals of same frequency but different phase. Depending on
what he has a generator, there are many that are capable of adjusting
the phase of the signal. Naturally, he will need to calibrate the signal
to cancel out errors in the system.
Unread postPosted: Tue Feb 15, 2005 3:43 am
I have an idea abot this.
If I put a trigger with the same frequency
of the two signals that I want get, and I sincronyze all, Can I get
in the output the two signals stable in phase ??
Tue Feb 15, 2005 4:15 am
I have an idea abot this.
If I put
a trigger with the same frequency of the two signals that I want get,
and I sincronyze all, Can I get in the output the two signals stable
in phase ??