http://www.timeok.it/files/5_to10_mhz_advanced_doubler.pdf
Best regards, Luciano
Luciano P. S. Paramithiotti
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Thank you Luciano for the circuit. It never fails. I got your message 1
minute!! after placing an order for PC boards. I would have loved to add it to
this order, how ever I will lay it out and add it to the next run.
Thanks again...
Bert Kehren
In a message dated 2/14/2011 5:35:12 A.M.
Paramithiotti, Luciano Paolo S wrote:
http://www.timeok.it/files/5_to10_mhz_advanced_doubler.pdf
Best regards, Luciano
Luciano P. S. Paramithiotti
The claimed 50 ohm input impedance is incorrect except perhaps for small
signals.
For large signals the input impedance will be much lower
thankyou, sorry for time misalign.
At the moment I am preparing my final version that will add an input low pass
filter to accept input signals with moderate harmonic distortion , some more
adjustments and a dual 13 dBm separate output with separation more than 50dB.
Next future:
- 10 to 5
Hi Bill I have never worked on quartz crystals, but I was attached to a
group that had made many of them for the British Post Office in the 1950s. I
also used, and replaced, a lot in commercial 2-way radios in the 1980s and
90s.
First are you really sure the crystal has changed it is more likely
Hi
From a number of radios I've torn crystals out of and looked at:
1) The blank is broken / cracked. Most likely the radio got dropped somewhere
along the line. Just like that stone hit on your windshield (on two cars at the
moment), the crack can start small and propagate. Time from impact
Luciano
Please keep me posted, I will add it to the next run.
Bert
In a message dated 2/14/2011 6:35:40 A.M. Eastern Standard Time,
luciano.paramithio...@hp.com writes:
thankyou, sorry for time misalign.
At the moment I am preparing my final version that will add an input low
pass
I just picked one of these up for basically nothing but typical
Anritsu I can't anything.
-pete
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Hi;
I would like to change my settings to receive only one daily digest. The
website is not clear on how to make the change for existing subscribers.
Can the administrator adjust this for me? Thanks
--
Joe Leikhim
Leikhim and Associates
Communications Consultants
Oviedo, Florida
has anyone done a setup where the TB is running from a battery when
one is using its output. Something like you do
with pico amp meters, or I do with the Fluke 845AB null meter ?
-pete
On Sun, Feb 13, 2011 at 11:29 PM, Flemming Larsen oz...@yahoo.dk wrote:
I have a Power-One switching power
On 2/14/2011 11:45 AM, Joe Leikhim wrote:
Hi;
I would like to change my settings to receive only one daily digest. The
website is not clear on how to make the change for existing subscribers.
Can the administrator adjust this for me? Thanks
Unfortunately, the digest can't be changed
Thanks; That explains the multi posts. I was sure I was set for daily
digest and apparently I am, but as you explain, daily is 30KB. I will
figure out a work around here to redirect to a folder. Thanks
On 2/14/2011 12:15 PM, John Ackermann N8UR wrote:
On 2/14/2011 11:45 AM, Joe Leikhim wrote:
Hi,
I am looking to purchase an HP 5372A Analyzer. Let me know if you would like to
sell one.
Thanks,
Bert.
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If no one has one they want to sell you put (5327A,5373A) in a EB
search that e-mails you when one shows up, then bid what you want to
pay repeat until win one.
Don't forget about shipping, for me it was like 3x the cost of the 5372A
-pete
On Mon, Feb 14, 2011 at 9:25 AM, Bert, VE2ZAZ
Hi
Can be done with a couple of switchers. I'd do the switcher = LDO trick to
clean things up. Bert has a setup running that way.
I would not try to run one directly off of a battery. Either you would have
a pretty big battery, or it would not last long.
Bob
-Original Message-
From:
I think you should look at the specifications for the noise-rejection
capability of those three-terminal regulators. They are simple and
inexpensive but not particularly good at noise rejection. Some of the
noise from the switcher supply will pass through. Is it enough to cause
a real problem?
I rethinked the problem after reading several papers.
OK. We have an if-strip. To avoid spectral regrowth in later stages
because of saturation, the input must be momentary amplitude
controlled. Pulses and bursts at the input will saturate somewhere in
the stages. An common AGC is always
Hello all
My SRS PRS10 ( http://www.thinksrs.com/products/PRS10.htm ) Rubidum
frequency standard was power cycled a few days ago, since then it has
not achived rubidium lock.
I have tried a full rest and also further power cycles with no joy.
The SRS RS232 application reports the following
As mentioned before a suitably rated single transformer with a center tapped
secondary will suffice if you want to build your own linear psu. I use a 2 amp
25.2 volt center tapped transformer (along with a bridge rectifer, filter caps,
3 terminal regulators, fuse holder etc.)
I don't losse
On 14/02/11 19:31, Larry McDavid wrote:
I think you should look at the specifications for the noise-rejection
capability of those three-terminal regulators. They are simple and
inexpensive but not particularly good at noise rejection. Some of the
noise from the switcher supply will pass through.
Hi,
I use a similar setup but used an arangement the uses full wave
rectification for the 12V and a single diode half wave rectifier for the 5V so
the regulator did not have such high dissipation.
Robert G8RPI.
--- On Mon, 14/2/11, Mark Spencer mspencer12...@yahoo.ca wrote:
From: Mark
Hi
Ok, since this keeps coming up, here's the full blow by blow of everything
you need to do. Nothing left to the imagination :)
You have a switcher running into a filter running. The filter feeds into
three terminal regulators. The regulators are running into the TBolt. Power
to the switcher
Has anybody investigated simple L-C (R-L-C) filters rather than linear
regulators?
The SI-List recently announced a good paper on using ferrite beads.
http://www.ipblox.com/papers.html
(Currently, it's the top paper. In case somebody finds this in the archives,
it's the one marked DesignCon
I use ferrite beads the old ones where the wire goes through a round
cylinder five times I get them from Radio Conrad item # 50 21 97 36, 16 cents
each and capacitors followed by regulators. The regulators are close to the
Tbolt the rest is with the batteries and switchers. Works fine for
Bob wrote:
A three terminal regulator, properly chosen, will do a great job down at
audio.
Depends on what you mean by great job. All of the 3T regulators
I'm familiar with have at least two orders of magnitude more noise
than a well-designed LN analog regulator -- many have much more
Hi
If all you are doing is running a Thunderbolt, you don't need a supply
that's more quiet than most batteries. People get reasonable performance off
of straight switcher outputs. Adding simple linear + filtering gets you well
into the overkill region on this application. The idea is to stop
Hi
Ferrite beads are wonderful things. I use them all the time.
For this application (main filtering between a TBolt and a switcher) - not a
good place to use them. You don't get enough impedance at the switcher
frequencies. There are better (and equally cheap) parts available.
Bob
Greetings and my first post from a down-under lurker.
A reasonably simple way of producing a clean supply would be the finesse
regulator here
http://www.wenzel.com/documents/finesse.html
I'm not sure how well would clean up the spikey stuff from a switcher though.
--
Cheers, Ken
This thread makes me appreciated the Symetricom. Just apply 24V and let the
internal switcher and regulator do the work.
I've designed chips with both bipolar and Pfet pass devices. I really don't
like the PNP pass device scheme used in LDOs. There are all sorts of design
kludges involved in
Bert,
I've got a 5372a and am looking to pass it on to a new owner. It does work.
First, the bad. Has minor screen burn. Also someone took and used a sharpie on
it's face. Not too obnoxious.
Good: Last time I played with it, it passed the HP operator's check. Will do it
again if you're
Just got one of these out of the recycle of a office building being
gutted. It was the only thing in the scape drop box I could find.
2 RU rack unit runs off 48 VDC
The pleasant surprise is it contains a Efratom LPRO-101.
The TNC marked ANTENNA goes to a Datum board called a TIME EXTRACTOR
Bob wrote:
If all you are doing is running a Thunderbolt, you don't need a
supply that's more quiet than most batteries.
Most batteries are *very* quiet -- it takes heroic measures to get
*any* actively regulated supply into that ballpark. Indeed, one
might be tempted to run a Tbolt off of
Very interesting Bob Thanks.
It brings to mind an annoying issue I run into from time to time.
VCXO 12.8 Mhz used as a reference in communications gear. Most of the gear is
roughly 10 years old and of similar make, both mobile and portable styles.
They all are dropping in operating
And sorry about the typos! Still getting used to this touch screen!
Sent from my iPhone
On Feb 14, 2011, at 19:47, Shawn Tayler sh...@xmtservices.net wrote:
Very interesting Bob Thanks.
It brings to mind an annoying issue I run into from time to time.
VCXO 12.8 Mhz used as a reference
Peter you sure run across the craziest things. The odetics and now this.
I might guess it listened to the cel phone tower timecode maybe? Most likely
the old 900 mc stuff. They decommissioned all of that making that unit
useless.
Totally guessing here.
Someone will know.
Regards
Paul
WB8TSL
On
On Mon, Feb 14, 2011 at 7:47 PM, Shawn Tayler sh...@xmtservices.net wrote:
My question is what is the process in the aging if the crystals that causes
this drop in frequency? I understand it may be mechanical but the level if
vibration the radios are exposed to varies greatly and there does
Pete-
My guess is the TIME EXTRACTOR does such for someones CDMA network ?
Anyone know about this thing ?
If you connect a supply to one of the inputs (it has redundant supplies) and a
cell
antenna to the TNC, it will lock onto the standard in the cell tower and you
have a
We have an OT-21 Office Time here, which is presumably similar. The
Antenna input is for GPS L1 5V, and the unit supplies Telco outputs. It
can also take in telco signals and re-time them. You may have a
beautiful GPSDO, albeit with 2.048MHz outputs...
Regards,
Laurence Motteram
On 2/14/11 7:47 PM, Shawn Tayler wrote:
Very interesting Bob Thanks.
It brings to mind an annoying issue I run into from time to time.
VCXO 12.8 Mhz used as a reference in communications gear. Most of the gear is
roughly 10 years old and of similar make, both mobile and portable styles.
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