Hi Matt,
Thank you for your prompt reply, yes I understand, the problem these
days is there are more and more mobility and poeple sending their emails
to their mobile phones.
May be an idea is to have two style of digests like heavy or lite,
or another solution to offer users to choose the
A few months ago I bought an HP 8647A signal generator that had the
plastic shaft of an optical encoder sheared off at the bushing. I had
to take the encoder apart and graft an aluminum shaft onto the stub of
the plastic one. To my amazement, it worked!
Ed
Don Latham wrote:
I've fixed
The 0032 was an op-amp and the 0033 and 0063 a buffer. The 0063 was a high
power/higher slew-rate version. They were, and still are, great to use. I do
have some 0032s and 0033s. Never played with the 0063. 73 - Mike
Mike B. Feher, N4FS
89 Arnold Blvd.
Howell, NJ, 07731
732-886-5960
Hi
That's the one, right down to the description of the pots. If it doesn't become
a working counter, it's cheap enough to be a parts donor. Of course having
multiple counters all with the exact same broken parts doesn't do much good
.
For the external arm level control I might go for a
Jim
Worse case if you do not find the replacement
Digi-key and I would guess mouser caries the filter material for a
reasonable price.
(At least they did)
I needed some to replace a missing piece on a HP 5360 and HP 8505.
On Sat, Feb 27, 2010 at 10:44 PM, Jim Cotton jim.cot...@wmich.edu wrote:
You went quite??
On Sat, Feb 27, 2010 at 9:54 AM, paul swed paulsw...@gmail.com wrote:
Gerard you have some great comments already and welcome back to the
electronics hobby.
A couple of things.
Curious about whats on the board etc.
Here would be my thoughts.
If the same 10 MC signal thats
I have a 5370B that is missing about half of it's red plastic digit
cover/window and would like to repair it as well. Do you have a suggestion
as to how to start searching Digi-Key and Mouser?
Thanks,
Joe
-Original Message-
From: time-nuts-boun...@febo.com
Hi
Putting The C on the feedback R in a positive gain setup is only going to take
the roll off gain down to 1. Doing the same with an inverting amp or using a
series R / cap to ground will drop the gain a lot more in the roll off region.
I would worry about any resistor that's marked as 10K
At 2:02 AM + 2/28/10, time-nuts-requ...@febo.com wrote:
Date: Sat, 27 Feb 2010 20:02:05 -0600
From: Ed Palmer ed_pal...@sasktel.net
Subject: Re: [time-nuts] Rack-mounting an LPRO?
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Message-ID:
Hi
A few words of caution here.
I have run compact rubidiums for a number of years. It is *very* tempting to
skimp on the heat sink. Cooling something that's heating it's self up sounds
silly.
Having tried the not much heat sink approach several times (I'm a slow
learner). The rubidium does
I have a Datum Rubidium Frequency Standard, which is a 1U aluminum
chassis that is about 2mm thick. It contains a LPRO and a 24V/5V power
supply with room to spare. I installed a Fury GPSDO and a small DC-DC
converter in the same enclosure. The top cover is vented. The chassis
stays
I found them in the led section
Try led filter???
On Sun, Feb 28, 2010 at 10:25 AM, J. L. Trantham jlt...@att.net wrote:
I have a 5370B that is missing about half of it's red plastic digit
cover/window and would like to repair it as well. Do you have a suggestion
as to how to start searching
An approach is to put just the rb unit in say the basement.
Its always cooler (at least mine is)
The area I work in can get pretty warm in the summer if I am gone for a week
This approach solves that problem pretty well
On Sun, Feb 28, 2010 at 11:25 AM, Bob Camp li...@rtty.us wrote:
Hi
A few
Joe Gwinn wrote:
At 2:02 AM + 2/28/10, time-nuts-requ...@febo.com wrote:
Date: Sat, 27 Feb 2010 20:02:05 -0600
From: Ed Palmer ed_pal...@sasktel.net
Subject: Re: [time-nuts] Rack-mounting an LPRO?
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Message-ID:
Gerard,
By now you've no doubt had more offers to assist than you need, and in
particular from far more local enthusiasts than me.
However, if I can help answer any particular points, I would be pleased
to do so. My reason for suggesting this is that I have available a
Pendulum CNT-90 counter,
Gerard,
I just read your post about your DIY counter and asking for help.
I'm not sure when you actually wrote it.
I'm based in Chelmsford Essex and can give you some help.
I have multiple frequency standards as well as 4 x SR620 timer counters.
Let me know if I can be of help.
Regards
My simulations indicate that terminating the Mixer IF port in an RF
short (with both RF and LO ports saturated) increases the beat frequency
zero crossing slope by more than a factor of 2 (exact value depends on
mixer component characteristics) but doesnt significantly increase the
beat
Don Latham wrote:
I've fixed shafts like this carefully with plastic swizzle sticks and
super glue. Did I say carefully? a little dab'll do ya...
Don
It is a tricky business. The 5370A I got a while back, had what was left
of the shaft glued into the bushing by an earlier repair attempt.
Gerard,
Gerard PG5G wrote:
Hello all,
First post here, so I'll start with a quick introduction. I trained as
an electronic engineer but don't work in that field any more, which has
given me the appetite back to do some electronic engineering as a
hobby. I have been a licensed ham
Hi
Here's some data:
The setup is very simple:
Two oscillators at 10 MHz driving common base / 50 ohm output buffers. The
buffers ensure that the source impedance is really 50 ohms. One puts out 9.3
dbm the other 9.5 dbm. They can be tuned for a beat note in the 0 to 100 Hz
range.
The
Hi
Left out:
All the data was taken with a beat note of roughly 10.2 Hz
Bob
On Feb 28, 2010, at 8:11 PM, Bob Camp wrote:
Hi
Here's some data:
The setup is very simple:
Two oscillators at 10 MHz driving common base / 50 ohm output buffers. The
buffers ensure that the source
Rock I take to be crystal. How about gas and air?
Bill Hawkins
-Original Message-
From: Magnus Danielson
Sent: Sunday, February 28, 2010 5:15 PM
To: p...@b737.co.uk; Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] My DIY frequency counter and a request for
The results for the RPD-1's are about what I expected: there's little
difference in slope between either a 50 ohm +47nF termination or a 47nF
termination.
The slopes are about 6.5x greater than the values given by Minicircuits.
(8mv/degree = 2.88V/cycle). I assume that they use 500 ohms
Bill Hawkins wrote:
Rock I take to be crystal. How about gas and air?
Bill Hawkins
-Original Message-
From: Magnus Danielson
Sent: Sunday, February 28, 2010 5:15 PM
To: p...@b737.co.uk; Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] My DIY frequency
Whack! (sound of hand hitting forehead)
Gas must be Ru and Cs.
How do you run your pneumatic clocks?
Bill Hawkins
-Original Message-
From: Bill Hawkins [mailto:b...@iaxs.net]
Sent: Sunday, February 28, 2010 7:34 PM
To: 'Discussion of precise time and frequency measurement';
A while back we had a thread about Paris and a network of air synced clocks ?
Stanley
- Original Message
From: Bruce Griffiths bruce.griffi...@xtra.co.nz
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Sun, February 28, 2010 7:41:20 PM
Subject: Re:
Hi
The Minicircuits guys claim 800 to 1000 mv / radian. In my units that would be
5 to 6.2 volts per cycle. I believe I'm getting ~ 3 X that mostly from the open
circuit termination at audio. It's certainly something I could head back
downstairs and check.
The 10% increase in slope between
Hi
The winds in Sweden change directions in a *very* predictable fashion?
Bob
On Feb 28, 2010, at 8:50 PM, Stanley Reynolds wrote:
A while back we had a thread about Paris and a network of air synced clocks ?
Stanley
- Original Message
From: Bruce Griffiths
Probably hot air...
Murray
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of time-nuts-requ...@febo.com
Sent: Monday, 1 March 2010 2:56 p.m.
To: time-nuts@febo.com
Subject: time-nuts Digest, Vol 68, Issue 3
Send time-nuts mailing list
Hi
Ok, RPD-1 #1 puts out 9.97 volts into a 500 ohm resistor to ground termination
(no blocking capacitor). That's still well above the catalog spec. I'm running
25% more voltage than their 7 dbm. That still does not fully explain what I'm
seeing.
The scope does indeed indicate 15 volts when
Today I have been trying to drive a 5370B directly from a TADD-2, with
little luck (other HP freq counters seem to work OK). I was about to ask
about it on this list, but noticed this thread.
I guess this could explain why I am getting erroneous, random readings?
Dave
On Sat, Feb 27, 2010
What threshold are you using? If you leave it set to preset/0 volts, you
may find that crosstalk between outputs on the TADD-2 cause false
triggering. I usually use the divide-by-10 setting with the threshold set
to about 0.25V.
It also helps to remove the jumpers from any outputs on the TADD-2
The TADD-2 output drivers exhibit significant ringing and crosstalk due
to ground and Vcc bounce.
To minimise crosstalk dedicate each 74AC04 output device to a single
frequency and load.
Because of the ringing setting the trigger threshold is more critical
than usual.
No damage occurs
Unless Minicircuits have made significant changes to the RPD-1 there has
to be some kind of calibration error or an as yet poorly understood effect.
Did you try the load and filter shown in the attached application note?
Replicating Minicircuits measurements within 10% or so is probably
Thanks for the tips John. Do you use the 50 ohm or 1M ohm settings with the
TADD-2?
Dave
On Sun, Feb 28, 2010 at 7:42 PM, John Miles jmi...@pop.net wrote:
What threshold are you using? If you leave it set to preset/0 volts, you
may find that crosstalk between outputs on the TADD-2 cause
Thanks for the tips Bruce.
Is there a better version of the 74AC04? It sounds like I should also
use an attenuator, perhaps 3 - 10 dB...
Dave
On Sun, Feb 28, 2010 at 7:43 PM, Bruce Griffiths bruce.griffi...@xtra.co.nz
wrote:
The TADD-2 output drivers exhibit significant ringing and
If you drive it from 50-ohm coax, you need to use the 50-ohm setting, or the
resulting reflections may cause trouble. The 74AC04s in the TADD-2 are
happy enough driving 50 ohms, so that's the best way to go.
-- john, KE5FX
-Original Message-
From: time-nuts-boun...@febo.com
You could substitute a 74AHC04 which has better control of ground and
Vcc bounce.
At least they are specified.
At least a 3dB attenuator with a 5370B.
at least 11dB with a 5370A.
Or just use the built in 20dB (10x) attenuator.
Bruce
Dave hartzell wrote:
Thanks for the tips Bruce.
Is there a
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