Boy is that the fact. Gotten me a time or 2.
Regards
Paul
WB8TSL
On Fri, Nov 7, 2014 at 9:13 AM, J. L. Trantham jlt...@att.net wrote:
Forgot to mention to be sure and check the front panel bulbs. Frequently
they burn out and you get no indication when everything is OK.
Good luck.
Joe
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of J. L.
Trantham
Sent: Thursday, November 06, 2014 8:19 PM
To: 'Discussion of precise time and frequency measurement'
Subject: [Bulk] Re: [time-nuts] [Bulk] Re: New Guy, has HP 5061A with
DATUM 7105A tube seeks advice
Wayne,
Forgot to mention this on my first post.
On the front panel:
1. Set the MODE to 'CS OFF'
2. Set OSC FREQUENCY five turn pot to '250' (not COARSE).
3. Set MOD to 'ON'.
4. Set C FIELD to whatever the front door says it should be.
5. Set CIRCUIT CHECK to 'ION PUMP I'.
Plug it in and wait. ION PUMP I will likely (should) go full scale. Only
once it comes close to zero will you be able to advance further.
You can, however, switch CIRCUIT CHECK to its various positions and see
what the readings are.
BATTERY will not indicate since you removed the battery and charger card.
SUPPLY will indicate about 3/4 scale or a bit more to indicate that the
18.7 VDC is OK.
ION PUMP I will likely be 'full scale' but, in my experience, the Datum
tubes will pump down faster than the HP tubes. At least give it a couple
of days.
OSC OVEN will start full scale but will fall to about 3/4 scale as the
10811 heats up and comes to its operating temperature. If it does not come
down in about 30 to 60 minutes, there is likely a problem with the 10811.
CS OVEN will be at zero until you turn MODE clockwise past CS OFF. It
will then go full scale and after 30 to 60 minutes will indicate similar to
OSC OVEN, assuming everything is OK.
5 MHZ should be about 2/3 scale.
MULT will not indicate until you flip the AUTO START - START switch to
START and then let it go back, IIRC.
BEAM I and 2nd HARMONIC will not indicate until you are past CS OFF on the
MODE switch and the CS OVEN indication comes back down 'on scale'.
CONTROL will indicate when you are in OPER on the MODE switch and have hit
the LOGIC RESET button once everything is 'on scale', assuming your OSC
FREQUENCY COARSE is 'in the ball park'. Once you have had the unit plugged
in and the OSC OVEN indication has 'come down', you can check the 5 MHz
against your GPSDO and then adjust the OSC FREQUENCY COARSE to bring it to
5.00 MHz. Once there, the PLL will likely be able to 'lock' and the
CONTINOUS OPERATION light should turn green after moving MODE to OPER and
hitting the LOGIC RESET button but only after all the other meter
indications are correct. If the light turns green, it is time for the
'happy dance'.
1 MHz and 100 kHz will indicate after flipping the START switch.
Hope this helps.
Good luck.
Joe
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Wayne
Holder
Sent: Thursday, November 06, 2014 7:14 PM
To: Discussion of precise time and frequency measurement
Subject: [Bulk] Re: [time-nuts] New Guy, has HP 5061A with DATUM 7105A
tube seeks advice
If you get the tube working, you should use a counter or Lissajous
display with a GPS or rubidium standard to preset it to the correct
resonance peak frequency for lockup. The tube will probably be pretty
noisy at first. If it also has weak beam current, which is common, it
will be very difficult to find the right peak without cheating.
I have a Trimble Thunderbolt GPS Disciplined Clock. Is that going to be
good enough to set the correct resonance peak frequency for lockup?
BTW, thanks for the link to a source for a manual. I've ordered a copy
for my serial number range.
Wayne
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