bo.com
> [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob Camp
> Sent: Friday, October 19, 2012 13:20
> To: 'Discussion of precise time and frequency measurement'
> Subject: Re: [time-nuts] HP 10811 Tuning Diode
>
> Hi
>
> The normal 10811 package has several
ject: Re: [time-nuts] HP 10811 Tuning Diode
I didn't notice any damage, nor was there a visibly bad solder joint.
However, I couldn't reproduce the excess noise with a quick bench test at
30V / 100k neither.
DC-wise there are a few microvolts only. Same with the SMD diode.
Exept, wh
As I mentioned, the varactor is equivalent to the Motorola MV1650. I
have a bunch as well left over from building VCXOs. :-)
David
On 10/19/12 3:37 PM, Rick Karlquist wrote:
Slightly off topic: the oscillator transistor has some 1854-
part number, but is actually a 2N5179 selected for s
m] On
Behalf Of Adrian
Sent: Friday, October 19, 2012 4:10 PM
To: rich...@karlquist.com; Discussion of precise time and frequency
measurement
Subject: Re: [time-nuts] HP 10811 Tuning Diode
I didn't notice any damage, nor was there a visibly bad solder joint.
However, I couldn't reproduc
I didn't notice any damage, nor was there a visibly bad solder joint.
However, I couldn't reproduce the excess noise with a quick bench test
at 30V / 100k neither.
DC-wise there are a few microvolts only. Same with the SMD diode.
Exept, when the original glass diode is exposed to light. With a L
Slightly off topic: the oscillator transistor has some 1854-
part number, but is actually a 2N5179 selected for some minimum
fT at 30 mADC collector current. When the oscillator starts up,
before the ALC takes effect, a fairly large DC current can flow
and some 2N5179's don't have enough gain
s-boun...@febo.com
> [mailto:time-nuts-boun...@febo.com] On Behalf Of Rick Karlquist
> Sent: Friday, October 19, 2012 11:01
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] HP 10811 Tuning Diode
>
> I wonder if the glass case got a crack in it or
I wonder if the glass case got a crack in it or if the kovar seal
was failing. Maybe a failed solder joint (which gets fixed when you
install the new diode). I've never heard of a noisy varactor before either.
Rick
___
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Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of John Miles
Sent: Thursday, October 18, 2012 11:55 PM
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] HP 10811 Tuning Diode
That's extremely interest
boun...@febo.com] On Behalf Of Adrian
Sent: Thursday, October 18, 2012 12:19 PM
To: Discussion of precise time and frequency measurement
Subject: [time-nuts] HP 10811 Tuning Diode
Hello,
I found the 10811 in my 8662A to be quite noisy and was able to trace
the problem down to the tuning diode.
Actual
low-ish capacitance
> value. I haven't gotten around to digging into the problem any farther.
>
> Anyone have any more info or ideas?
>
> 73,
>
> Tom WB6UZZ
>
> --- On Thu, 10/18/12, John Miles wrote:
>
> From: John Miles
> Subject: Re: [time-nuts] HP 1
itance value. I
haven't gotten around to digging into the problem any farther.
Anyone have any more info or ideas?
73,
Tom WB6UZZ
--- On Thu, 10/18/12, John Miles wrote:
From: John Miles
Subject: Re: [time-nuts] HP 10811 Tuning Diode
To: "'Discussion of precise time and
cise time and frequency measurement
> Subject: [time-nuts] HP 10811 Tuning Diode
>
> Hello,
>
> I found the 10811 in my 8662A to be quite noisy and was able to trace
> the problem down to the tuning diode.
> Actually, the phase noise started to jump when the oven heated up. As
Probably unobtainium.
0122-0244 is shown as Motorola SMV315-24 or MSI Electronics SQ529.
For whatever that's worth. Reminds me of a popular audio amplifier
design that was in Popular Electronics using Motorola SS1122 diodes.
Some special non catalog diode. Turns out Dan Myers, the designer,
just
That would be a Motorola MV1650 or equivalent. You may have to select
for 100pf +/- 5% @ 4V as the standard spec is 10% but it probably does
not matter as the tuning ratio will be greater than the >2 spec.
David
On 10/18/12 3:18 PM, Adrian wrote:
Hello,
I found the 10811 in my 8662A to be
Hello,
I found the 10811 in my 8662A to be quite noisy and was able to trace
the problem down to the tuning diode.
Actually, the phase noise started to jump when the oven heated up. As a
quick solution, I replaced it with a SMD type that I had at hands.
I would appreciate any hint where to fi
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