Hi
I have the Hp phase noise system with the 35601A but use most the time the
Wenzel Audio Amp referred to in this email. Perfect! I drive with it a
3561A and a 7L5! Works for me. The only problem is getting any more 2SK369.
Any recommendations?
Thanks Bert Kehren
In a message dated
http://cgi.ebay.com/5-pcs-N-Channel-Transistor-2SK369-K369-Low-Noise-BL-/150471697656
Stanley
- Original Message
From: ewkeh...@aol.com ewkeh...@aol.com
To: time-nuts@febo.com
Sent: Sat, August 21, 2010 6:07:25 AM
Subject: Re: [time-nuts] Phase noise measurement (was - no subject)
The Wenzel Audio amp is a little noisier than it need be and it has a
poor PSRR, so that a very low noise power supply with low ripple is
essential.
Its not too hard to improve the PSRR and the input noise of such a
current feedback amplifier.
There are JFETS (IF9030) with similar noise
On all phase noise measurements I use AGM batteries. specially for the
signal source to be measured. Keep six 12 V batteries for that around, every
thing from 7 to 20 Amps.
Bert
In a message dated 8/21/2010 7:33:57 A.M. Eastern Daylight Time,
bruce.griffi...@xtra.co.nz writes:
The
In message 4a8e.56751f36.39a11...@aol.com, ewkeh...@aol.com writes:
On all phase noise measurements I use AGM batteries.
Be aware that chemical batteries can be incredibly noisy, in particular
wet or semi-wet types.
It is not periodic noise, so for PN measurements with sensible
averaging
On 22 August 2010 00:07, Poul-Henning Kamp p...@phk.freebsd.dk wrote:
In message 4a8e.56751f36.39a11...@aol.com, ewkeh...@aol.com writes:
On all phase noise measurements I use AGM batteries.
Be aware that chemical batteries can be incredibly noisy, in particular
wet or semi-wet types.
Every now and then I get a request asking that I remove a post from the
time-nuts list archive because it was either meant for to an individual
rather than the list, or it inadvertently included personal information.
There is no easy way for me to remove a message from the archives; doing
so
I am not seeing it, what should I use to measure it 3561 and 7 spec
analyzer do not show it?
Bert
In a message dated 8/21/2010 8:07:41 A.M. Eastern Daylight Time,
p...@phk.freebsd.dk writes:
In message 4a8e.56751f36.39a11...@aol.com, ewkeh...@aol.com writes:
On all phase noise
Wenzel Audio Amp referred to in this email. Perfect! I drive with it a
3561A and a 7L5! Works for me. The only problem is getting any more
2SK369.
Any recommendations?
NXP BF862, available from digi-key.
I have used it in a similar hookup with good success. Its virtue is the
low
Hi
A simple gain of 20 (26 db) amp using an OP-37 does a pretty good job in front
of a spectrum analyzer. For a sound card you need more gain.
Bob
On Aug 21, 2010, at 11:42 AM, dk...@arcor.de wrote:
Wenzel Audio Amp referred to in this email. Perfect! I drive with it a
3561A and a
Thanks Bert
In a message dated 8/21/2010 11:43:53 A.M. Eastern Daylight Time,
dk...@arcor.de writes:
Wenzel Audio Amp referred to in this email. Perfect! I drive with it a
3561A and a 7L5! Works for me. The only problem is getting any more
2SK369.
Any recommendations?
NXP
On Aug 20, 2010, at 11:17 AM, Rick Karlquist wrote:
The AMC-123 can also be homebrewed by reading the
patent, which is listed on the data sheet.
I found it here:
http://www.freepatentsonline.com/3624536.pdf
Having read the patent, I find I'm still weak enough in the area of discrete
On Aug 20, 2010, at 3:41 PM, Rick Karlquist wrote:
It might still be available through Tyco/MAcom. They have continued to
make selected Anzac components. There was also an AM-123, which
was a TO-something can version.
My first quick scan didn't turn up any offered for sale, though I did dig
On Aug 20, 2010, at 5:11 PM, John Miles wrote:
Also, it looks like you (Mark) are only about an hour from Cerritos, where
the MUD ( http://www.microwaveupdate.org ) conference will be held at the
end of October. This could be one option for you. As part of the $35
registration cost, you get
In message 7c37.12cdef25.39a12...@aol.com, ewkeh...@aol.com writes:
I am not seeing it, what should I use to measure it 3561 and 7 spec
analyzer do not show it?
It is probably the 3561 not the 70k that has the best chance.
I am not aware of the precise characteristics of the noise, but it
Hi
I suspect you will have to hand wind the magnetics.
The 5109 was still in production last time I shopped for them.
Bob
On Aug 21, 2010, at 1:52 PM, Mark J. Blair n...@nf6x.net wrote:
On Aug 20, 2010, at 11:17 AM, Rick Karlquist wrote:
The AMC-123 can also be homebrewed by reading
Hi
There are a number of articles on the web detailing the art of getting one of
these to work. Since it's broad band feedback you need to be a little careful
with the layout and the transformer.
Bob
On Aug 21, 2010, at 2:50 PM, Mark J. Blair n...@nf6x.net wrote:
On Aug 21, 2010, at
On Aug 21, 2010, at 12:04 PM, Bob Camp wrote:
There are a number of articles on the web detailing the art of getting one of
these to work. Since it's broad band feedback you need to be a little careful
with the layout and the transformer.
Thanks, I'll continue digging.
--
Mark J. Blair,
It's still being made by Tyco / MaCOM:
http://www.macomtech.com/datasheets/AM-123_AMC-123.pdf
Adrian
Mark J. Blair schrieb:
On Aug 20, 2010, at 3:41 PM, Rick Karlquist wrote:
It might still be available through Tyco/MAcom. They have continued to
make selected Anzac components. There
On Aug 21, 2010, at 12:10 PM, Adrian wrote:
It's still being made by Tyco / MaCOM:
http://www.macomtech.com/datasheets/AM-123_AMC-123.pdf
Thanks! According to Avnet (the only one of their US distributors where I found
a price posted online), the price is around $600 each at quantity 5 for the
ewkeh...@aol.com wrote:
Thanks Bert
In a message dated 8/21/2010 11:43:53 A.M. Eastern Daylight Time,
dk...@arcor.de writes:
Wenzel Audio Amp referred to in this email. Perfect! I drive with it a
3561A and a 7L5! Works for me. The only problem is getting any more
2SK369.
Any
Poul-Henning Kamp wrote:
In message7c37.12cdef25.39a12...@aol.com, ewkeh...@aol.com writes:
I am not seeing it, what should I use to measure it 3561 and 7 spec
analyzer do not show it?
It is probably the 3561 not the 70k that has the best chance.
I am not aware of the precise
In message 4c703124.20...@xtra.co.nz, Bruce Griffiths writes:
Poul-Henning Kamp wrote:
NIST found that NiCd cells are very quiet at least for low load currents:
http://tf.nist.gov/general/pdf/1133.pdf
Too bad they didn't include lead-acid in that test...
Perhaps its the gelled electrolyte that
That's not really a surprise. Alone the hermetically sealed flatpack
housings don't make these a bargain...
There's nothing wrong with building your own.
Btw. there was an article in the German 'UKW-Berichte' (VHF
Communications) 4/1977 featuring a two stage BFT66 + BFR34A Norton amp
for 144
It is vain to do with more that which can be done with less.
In that case have a look here:
http://www.uploadarchief.net/files/download/freqlogger.zip
A PIC12F629 based RS-232 frequency logger.
No display and can be clocked by an external 10MHz clock if needed. My
version worked to 60 MHz.
Hi
One thing to head back to here:
What is being measured?
If the DUT is only as good as a 10811 and you have a 3561a, an AD797 is
overkill. That assumes you are running a RPD-1 or a high level mixer with
buffers. There aren't a lot of oscillators on the surplus market that will need
much
Hi group,
Warren found out that the signals TB gets out of my small ceramic typ
antenna are too weak. They are too noisy.
So I had a look for a good antenna and found some commercial typs called
choke-ring antenna. As they are really expensive is there any DIY solution
avaliable?
I have a
On Aug 21, 2010, at 7:15 PM, Peter Krengel wrote:
Warren found out that the signals TB gets out of my small ceramic typ
antenna are too weak. They are too noisy.
So I had a look for a good antenna and found some commercial typs called
choke-ring antenna. As they are really expensive is
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