[time-nuts] hp5061a/b no I beam current

[paul swed]

I think I may actually have the ability to read the tube output directly
using a resistivity meter that I have and disabling the HV. Just using the
rcv side.
See if I can see any output from the em
I suppose if the ionizer were wrong the illumination to the tube might be
off.
Given some of the tune details I have seen lately.

On Fri, Oct 23, 2009 at 1:27 PM, paul swed <paulswedb at gmail.com> wrote:

> Well I may be striking out here.
> Ionizer seems fine
> Did find the 3500 V supply at 3750
> Reduced with a 100 ohm R in the 18.75 feeder
> Tried the LF coil no luck on the tube no reading
> Checked ac amp lots of gain 80+db also fiddling around with that cable
> input did make the I beam meter move.
> So that circuits good.
> Checked the 90 MHz and 12.63 MHz both good. Discovered by the 12.63 the
> system is set for atomic time.
> About all thats left is to pull the frequency multiplier and check the 9GHz
> sig.
> But I believe the LF coil would have proved that and it did not.
> I sense the EM is DOA.
>
> I need to study up on those. But I speculate the only thing that runs that
> is is the -2500V.
> When I have seen them at hamfests I am unsure anything could go wrong with
> them.
> Do not recall a filament. That would basically leave me perhaps a open R in
> the multiplier string.
>
> Its a shame because this is a very clean 5061from the Naval Observatory.
>
>
>
>
>
> On Wed, Oct 21, 2009 at 2:45 PM, John Miles <jmiles at pop.net> wrote:
>
>> That'd most likely be normal.  The filament behaves just like a light bulb
>> in that regard.  The supply can't deliver 10 amps, presumably, so if it
>> can
>> put 1 volt across it, the resistance should be in the right ballpark.
>>
>> -- john, KE5FX
>>
>> > -----Original Message-----
>> > From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]On
>> > Behalf Of paul swed
>> > Sent: Wednesday, October 21, 2009 5:03 AM
>> > To: Discussion of precise time and frequency measurement
>> > Subject: Re: [time-nuts] hp5061a/b no I beam current
>> >
>> >
>> > Anyone ever see an ionizer short?
>> > I am reading .1 ohm, though like a light bulb maybe it goes up when hot.
>> > That seems low though at 1 volt and 1 amp maybe not.
>> > Your comment of 1-2 ohms is not what I am seeing. Though I do see
>> > 1 v across
>> > it in operation.
>> >
>> > On Tue, Oct 20, 2009 at 5:21 AM, John Miles <jmiles at pop.net> wrote:
>> >
>> > >
>> >
>>
>>
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