WB6BNQ wrote:
Bruce Griffiths wrote:
Magnus Danielson wrote:
Bruce Griffiths skrev:
David C. Partridge wrote:
Sort of related, but only just - however the signal to noise ratio here is
so good that I feel impelled to ask.
For 'scope calibration I'm
Dave,
You may want to look at the SG-503 Tektronix plug-in for a levelled sine
generator. It goes to 250 MHz, and the full service manual with schematics
is on my web site in the Manuals pages:
http://www.ko4bb.com/cgi-bin/manuals.pl
I have one and it works as advertised. Great for scope
How close to you want to be.
I always just use the 365.25 year length, so the time of birth rotates by 6
hours earlier each year; except in a leap year or the year after, depending on
if your birthday is before or after 28 Feb, when it moves 18 hours the other
way (back to actual time). We
David C. Partridge wrote:
Sort of related, but only just - however the signal to noise ratio here
is
so good that I feel impelled to ask.
For 'scope calibration I'm considering building a levelled sine wave
generator.
Ideally the specs I'm looking for are:
o Close to DC (10kHz or
Thanks for the pointer. I've taken a look at the AD8317. My main concern
is whether it will operate accurately over the full range of frequency as
the specification suggests a low frequency of 1MHz.
On the accuracy front, the data sheet seems to suggest +/-0.25dB over the
-50dBm to -10dBm range
Hi Didier,
I was actually considering an SG-504 to get the frequency range at the upper
end.I has however hoping to better both that and the SG-503 by putting
it all in one for the complete frequency range and ideally having a better
generator as as well.
Conceptually I was hoping to aim for
Bruce,
time-nuts-boun...@febo.com wrote on 12/11/2008 08:36:47 PM:
Joe
Attached is noise spectrum (1kHz and below) of AP192 with nothing
connected to inputs.
Sampling rate 96KSPS.
Frequency bin equivalent noise bandwidth ~ 3Hz.
Noise has similar spectrum to flicker noise with a noise
Magnus Danielson wrote:
Bruce Griffiths skrev:
David C. Partridge wrote:
Sort of related, but only just - however the signal to noise ratio here is
so good that I feel impelled to ask.
For 'scope calibration I'm considering building a levelled sine wave
generator.
Ideally the
Bruce Griffiths wrote:
Magnus Danielson wrote:
Bruce Griffiths skrev:
David C. Partridge wrote:
Sort of related, but only just - however the signal to noise ratio here is
so good that I feel impelled to ask.
For 'scope calibration I'm considering building a levelled sine wave
Bruce Griffiths wrote:
WB6BNQ wrote:
Bruce Griffiths wrote:
Magnus Danielson wrote:
Bruce Griffiths skrev:
David C. Partridge wrote:
Sort of related, but only just - however the signal to noise ratio here
is
so good that I feel impelled to ask.
For 'scope
Bruce,
time-nuts-boun...@febo.com wrote on 12/11/2008 07:44:01 PM:
Joe
Isolation from mixer RF to LO port may be too low when the mixer input
frequencies are different.
Injection locking can then occur all too easily (just ask Ulrich about
this) when the mixer RF ports are driven by 2
Bruce Griffiths skrev:
David C. Partridge wrote:
Sort of related, but only just - however the signal to noise ratio here is
so good that I feel impelled to ask.
For 'scope calibration I'm considering building a levelled sine wave
generator.
Ideally the specs I'm looking for are:
o Close
I have both the SG503 and SG504. You can get SG503's for cheap on Ebay. Also
SG504's... if they don't have the leveling head. The SG504 head uses a custom
ceramic hybrid detector (dual diode?) in the head (rough schematic in the SG504
manual available for download on BAMA). How about
Looking for comment here...
The background:
I'm working on a sub mm-wave LO chain for
a ham radio application. While chasing issues
of close-in phase (ie: within 1KHz of RF
carrier) by peeling the layers of the onion,
I'm starting to question the performance of
the MMICs that are used as buffers
Bruce Griffiths wrote:
Magnus Danielson wrote:
Bruce Griffiths skrev:
David C. Partridge wrote:
Sort of related, but only just - however the signal to noise ratio here is
so good that I feel impelled to ask.
For 'scope calibration I'm considering building a
Sort of related, but only just - however the signal to noise ratio here is
so good that I feel impelled to ask.
For 'scope calibration I'm considering building a levelled sine wave
generator.
Ideally the specs I'm looking for are:
o Close to DC (10kHz or 100kHz would be fine) up to at least
David C. Partridge wrote:
Sort of related, but only just - however the signal to noise ratio here is
so good that I feel impelled to ask.
For 'scope calibration I'm considering building a levelled sine wave
generator.
Ideally the specs I'm looking for are:
o Close to DC (10kHz or 100kHz
Hello Brian,
I hope you and yours have the very best of this Holiday Season.
My considerations would be similar to spurious free dynamic range,
keeping all discrete intermodulation products very low, which
would in turn keep the intermodulation noise very low.
When you drive an amp towards and
Thanks John,
First Rule - Stay off the internet when it is a eventful birthday and you have
had a couple of beers.
Your answer is what I was after after.
I looked at the numbers again last night, could not get there.
I remember when I was a kid, I tried to figure out if my birthday should be
Happy Holidays to Nuts of all types,
Looking for a copy of the GPIB section of a PTS Synthesizer manual,
preferably a 160, if it makes a difference. My manual only has the
standard PTS remote information.
Thanks,
Had, K7MLR
___
time-nuts mailing
The painful part is probably the first few stages, if you are starting at 5
MHz. You probably want to do some HP 8662A-like tricks using crystal
filters to shave off the broadband noise below 1 GHz, and maybe SAW filters
above that. This will do nothing for noise within 1 kHz, though... do you
Dave,
How about using a true signal generator?
I have not checked the spec for my HP 8657B (it's flat enough for what I
do), but it will do all that you are asking for, and being a true
synthesizer, it can be used for much more than just calibrate scopes.
If flatness is not good enough, that
If I could find a suitable sig-gen with the amplitude range, frequency range
and the external levelling capability I'd probably go there (subject to
cost). I've looked at the 8657A and B before, but as I didn't see anything
in the specification sheet about being able to use an external
I really enjoy reading the mail on this group, but I thought it was the
'front molecule on the cutting edge'.
Joe
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com]on
Behalf Of John Miles
Sent: Monday, December 15, 2008 1:15 PM
To: Discussion of
John-
I do agree with you. The pain is in the early stages of the
LO chain. Since I'm planning to use QRSS CW (that's very
slow speed Morse Code with very narrow demod bandwidths for
non-hams on this reflector who may not be familiar with QRSS),
the noise very close to the carrier become key.
A
I would assume that the bleeding takes place
just after the first molecule has performed it's
dissecting task.
-- Original message from J. L. Trantham, M. D.
jlt...@worldnet.att.net: --
I really enjoy reading the mail on this group, but I thought it was the
'front
In a message dated 15/12/2008 18:44:04 GMT Standard Time, h...@to-way.com
writes:
Looking for a copy of the GPIB section of a PTS Synthesizer manual,
preferably a 160, if it makes a difference. My manual only has the
standard PTS remote information.
Hi Had
If you
Joseph M Gwinn wrote:
Bruce,
time-nuts-boun...@febo.com wrote on 12/11/2008 08:36:47 PM:
Joe
Attached is noise spectrum (1kHz and below) of AP192 with nothing
connected to inputs.
Sampling rate 96KSPS.
Frequency bin equivalent noise bandwidth ~ 3Hz.
Noise has similar spectrum to
In a message dated 15/12/2008 21:05:16 GMT Standard Time, gandal...@aol.com
writes:
If you check out the PTS manuals I uploaded to Didier's site I'm sure one
of
those has the GPIB section, if not let me know and I should be able to scan
it from one of my other manuals.
My original
Joe
Joseph M Gwinn wrote:
Bruce,
time-nuts-boun...@febo.com wrote on 12/11/2008 07:44:01 PM:
Joe
Isolation from mixer RF to LO port may be too low when the mixer input
frequencies are different.
Injection locking can then occur all too easily (just ask Ulrich about
this) when the
wa1...@att.net wrote:
Looking for comment here...
The background:
I'm working on a sub mm-wave LO chain for
a ham radio application. While chasing issues
of close-in phase (ie: within 1KHz of RF
carrier) by peeling the layers of the onion,
I'm starting to question the performance of
the
Bruce,
time-nuts-boun...@febo.com wrote on 12/15/2008 04:34:34 PM:
Joseph M Gwinn wrote:
Bruce,
time-nuts-boun...@febo.com wrote on 12/11/2008 08:36:47 PM:
Joe
Attached is noise spectrum (1kHz and below) of AP192 with nothing
connected to inputs.
Sampling rate 96KSPS.
Bruce,
time-nuts-boun...@febo.com [Bruce] wrote on 12/15/2008 04:56:26 PM:
Joe
Joseph M Gwinn wrote:
Bruce,
time-nuts-boun...@febo.com wrote on 12/11/2008 07:44:01 PM:
[snip]
Using a passive splitter for the LO drives will gain at least another
30dB in isolation
Bruce-
OK... So, linear operation does therefore seem to be the preferred
way to operate these MMICs rather than operation into compression.
That's what I seem to be observing if only because my final RF
frequency is so high and RX bandwidth so low.
Having said that, if my frequency synthesis
Brian
Low frequency noise modulates the switching times of the mixer
components and hence produces close in phase noise.
Diode mixers especially those using Schottky diodes have lower flicker
noise than active mixers.
Passive FET mixers are not immune to flicker noise.
The level of such flicker
Brian,
I also think the linear operation would be better, but not
so sure if bipolar transistors wouldn't be preferred
over MMIC's for this (on bottom part of the spectrum)
(ok... is not so handy).
What I can certainly add to the discussion is that
power amplification followed by higher rate
Just wondering if anyone has ever tried the MAX2470/2471
VCO buffers as part of a reference distribution design?
_http://www.maxim-ic.com/quick_view2.cfm/qv_pk/1985_
(http://www.maxim-ic.com/quick_view2.cfm/qv_pk/1985)
MAX2471specs:
10-500 Mhz
75 dB reverse isolation at 100 MHz
Colleagues,
Would any of you be able to direct me to operation and/or service
documentation for the II Morrow A22 LORAN Signal Generator?
My web-searches have not proven eventful. The IC date codes put the
manufacturing date in the 1985-1987 time periods.
Any help would be appreciated.
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