Hal Murray wrote:
bruce.griffi...@xtra.co.nz said:
If there is no electronic tuning available one can use a DDS based
synthesiser to produce a corrected output frequency. However close in spurs
will be problematic unless one use a couple of simple mix and divide stages
or resorts to a
I found this interesting as a newbie.
http://tf.nist.gov/general/glossary.htm
Regards
--
Raj, VU2ZAP
Bangalore, India.
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
Hal Murray wrote:
bruce.griffi...@xtra.co.nz said:
If there is no electronic tuning available one can use a DDS based
synthesiser to produce a corrected output frequency. However close in spurs
will be problematic unless one use a couple of simple mix and divide stages
or resorts to a
Thanks everyone.
Indeed the nuvistors will be a challenge.
Don't know if between the 2 recvrs I have enough or if they are good or
bad...
But if need be a bit o redesign may be in order.
I am currently using a fair size copper tune loop/preamp on a tracor 599H.
So thats a good start. But I will
Hi Paul,
Some tube testers can test Nuvistors. I don't think they go gassey much,
but with long use the filament emission drops or the filaments go open. So
the condition of yours may depend on how much they were used. They are
normally pretty long lived.
The HP Loop has some gain and is
have to work?
And it ain't even finished yet.
You see? Don't do it, don't even think about starting.
Go buy a trimble thunderbolt, it will save you LOTS of time!
http://www.dulli.org/pics/20100502%20-%20Clock.jpg
Original-Nachricht
Datum: Sat, 01 May 2010 14:28:04 -0500
Von: ch
of time!
http://www.dulli.org/pics/20100502%20-%20Clock.jpg
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
http://www.tubesandmore.com/
Has the 13CW4s for the loop antenna and 6CW4/6DS4s for the receiver.
Regards.
Max. K 4 O D S.
Email: m...@maxsmusicplace.com
Transistor site http://www.funwithtransistors.net
Vacuum tube site: http://www.funwithtubes.net
Music site: http://www.maxsmusicplace.com
Does anyone use mechanical adjustment with a servo,
gear train and microcontroller?
Might be useful as a tool to calibrate standards without electronic fine
adjustment but would think it would ware out the capacitor if used to make
continuous adjustments. Wonder if they make adjustment tools
it, don't even think about starting.
Go buy a trimble thunderbolt, it will save you LOTS of time!
http://www.dulli.org/pics/20100502%20-%20Clock.jpg
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman
even think about starting.
Go buy a trimble thunderbolt, it will save you LOTS of time!
http://www.dulli.org/pics/20100502%20-%20Clock.jpg
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman
Hi Max,
Are you sure the main unit uses 6CW4s? It's been 20+ years since I last
had my unit apart, but I thought the 60 KHz amp in the main chassis used
Nuvistors with either grid or plate caps, something I'd never seen before.
I also remember the Nuvistors were numbered something like 7xxx.
I
Lueddecke wrote:
You see? Don't do it, don't even think about starting.
Go buy a trimble thunderbolt, it will save you LOTS of time!
http://www.dulli.org/pics/20100502%20-%20Clock.jpg
___
time-nuts mailing list -- time-nuts@febo.com
Bob asks a reasonable question:
What kind of accuracy are you trying to obtain?
Bob
I would like to end up with something that is usable
on a home electronics workbench. Something like a
Z3801. Something I can use if I ever try to do some
goofing around with microwave radio operation.
For what it's worth, I just took a look and found a bunch of 6CW4's
on eBay. See:
Jim,
More technical stuff @ http://www.sotiriadis.info/
Pete Rawson
On May 2, 2010, at 10:27 AM, jimlux wrote:
Hal Murray wrote:
bruce.griffi...@xtra.co.nz said:
If there is no electronic tuning available one can use a DDS based
synthesiser to produce a corrected output frequency. However
Hi
Microwave radio suggests low spurs and often low phase noise. That's on top of
the stability requirements.
In terms of stability a good Z3801 will run rings around a garden variety
Thunderbolt. Both are significantly better on phase noise than a garden
variety OCXO. You will need a *very*
Niels Lueddecke id...@abwesend.de wrote:
Don't do it, it may drag you deep into nut territory...
All i wanted was a clock based on a cheap LPro rubidium.
Next thing i knew were strange things piling up on my desk.
Now theres a custom power supply, 7 AVRs on a couple of boards,
an FPGA
Indeed there are.
And even 7587s thats the TRF frontend. In one of the units V3 appears bad
all Rs are good voltage high on plate, 0 cathode current. But oddly when I
swap v1 into position same effect so somethings odd. Or my methods not
correct.
The other units working. Had to replace a shorted
Well, I didn't get a manual with my receiver and I've never had it apart. I
was just assuming that it used standard newvistors. Assuming is always a
dangerous thing to do.
Regards.
Max. K 4 O D S.
Email: m...@maxsmusicplace.com
Transistor site http://www.funwithtransistors.net
Vacuum
Hi Max,
Take the top cover off. There is a shield box that may have useful info
stenciled on top (2 - 4 screws) I have a HC manual, but cannot access it
and won't be able to for some time.
Best,
-John
=
Well, I didn't get a manual with my receiver and I've never had it
And the 7587 even has a plate cap! LoL.
There might be RF chokes in the Nuvistor filament line. Worth a look.
FWIW,
-John
===
Indeed there are.
And even 7587s thats the TRF frontend. In one of the units V3 appears bad
all Rs are good voltage high on plate, 0 cathode current.
Well just one O those days.
Heavens knows why but I had 7 nuvistors and I don't have any idea when I
picked them up.
6CW4s and a few other types. But lo and behold one 7587.
Plugged in getting signal and osc locked. Its definitely not a hot tube but
it proved the tube was indeed the issue.
Checked
Uses 1 6cw4 at the integration amp and 3 X 7587s for the RF amps.
All 4 tubes filaments are series from the +35v which seems a bit high per
tube.
Buts thats the way its designed
On Sun, May 2, 2010 at 5:52 PM, J. Forster j...@quik.com wrote:
Hi Max,
Take the top cover off. There is a shield
OK. I'd forgotten about the integrator.
I've not looked at mine since about 1986 when I switched to LORAN. The
117A been switched off since. I've just been going for memory.
Enjoy,
-John
Uses 1 6cw4 at the integration amp and 3 X 7587s for the RF amps.
All 4 tubes
starting.
Go buy a trimble thunderbolt, it will save you LOTS of time!
http://www.dulli.org/pics/20100502%20-%20Clock.jpg
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/
listinfo/time-nuts
advisers telling me to
buy the Thunderbolt. But I already have these pieces
so...
--
Chris
w0ep
Niels Lueddecke wrote:
You see? Don't do it, don't even think about starting.
Go buy a trimble thunderbolt, it will save you LOTS of time!
http://www.dulli.org/pics/20100502%20-%20Clock.jpg
Looking for one or more of these (obsolete) DAQ adapters. Anyone got any
spares?
-- john, KE5FX
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions
For what it may be worth, I've swapped Nuvistors out with FETS. I
see from the schematic that the Nuvistors are running on 35
Volts. It would be simple to drop the 35 Volts to 12 or 8 Volts with
a 3 terminal regulator in the receiver. If desperation sets in, try
stuffing N-Channel FETs in
Interesting idea. In fact, the later versions of the loop used FETs in
place of Nuvistors. I've not compared the circuits.
Because the thing is only 60 KHz, the change in grid/gate capacitance may
not matter much. There may be some mounting and stability issues though
because the plate caps were
You can also look up the gm of the nuvistors and get a reasonable match to a
fet as well.
Don
- Original Message -
From: J. Forster j...@quik.com
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Sunday, May 02, 2010 9:23 PM
Subject: Re: [time-nuts]
31 matches
Mail list logo
