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Old September 1st 05, 11:54 AM
John A
 
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Default Help finding equivalent diodes needed

I've an HP 8558B Spectrum Analyser with dud diodes in its first mixer (one
shows 0.33v forward, high resistance reverse, the other 11 ohms either way
around)

The official part 08558-20095 and its replacement 08558-60152 have long
become obsolete. Can anyone suggest a substitute? The application is in a
low power balanced mixer mixing input signals in the range 0 to 1500MHz with
a Local Oscillator tuning from 2050MHz to 3550MHz to produce a signal
passing through a 5000MHz low-pass filter to a 2050MHz bandpass filter. The
present diodes are small glass wire-ended diodes about 4mm long and about
1mm diameter.

Many thanks in advance.

John



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Old September 1st 05, 03:13 PM
Michael A. Terrell
 
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Default

John A wrote:

I've an HP 8558B Spectrum Analyser with dud diodes in its first mixer (one
shows 0.33v forward, high resistance reverse, the other 11 ohms either way
around)

The official part 08558-20095 and its replacement 08558-60152 have long
become obsolete. Can anyone suggest a substitute? The application is in a
low power balanced mixer mixing input signals in the range 0 to 1500MHz with
a Local Oscillator tuning from 2050MHz to 3550MHz to produce a signal
passing through a 5000MHz low-pass filter to a 2050MHz bandpass filter. The
present diodes are small glass wire-ended diodes about 4mm long and about
1mm diameter.

Many thanks in advance.

John



Can you replace the mixer with something from Mini-circuits?
http://www.minicircuits.com/

--
Link to my "Computers for disabled Veterans" project website deleted
after threats were telephoned to my church.

Michael A. Terrell
Central Florida
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Old September 1st 05, 06:02 PM
Eamon Skelton
 
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Default

On Thu, 01 Sep 2005 11:54:45 +0100, John A wrote:


The present diodes are small glass wire-ended diodes about 4mm long and
about 1mm diameter.


Hello John,

I have a UHF mixer in my junkbox. It has a pair of of glass
Schottky diodes about the same size as yours. I think they
are HP 8000 series. I know that they work well on 23CM.
Picture he http://homepage.eircom.net/~ei9gq/diode.jpg


They are yours if you want them.

73, Ed. EI9GQ.



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Old September 2nd 05, 02:46 AM
Russ
 
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Default

On Thu, 01 Sep 2005 17:02:17 +0000, Eamon Skelton
wrote:

On Thu, 01 Sep 2005 11:54:45 +0100, John A wrote:


The present diodes are small glass wire-ended diodes about 4mm long and
about 1mm diameter.


Hello John,

I have a UHF mixer in my junkbox. It has a pair of of glass
Schottky diodes about the same size as yours. I think they
are HP 8000 series. I know that they work well on 23CM.
Picture he http://homepage.eircom.net/~ei9gq/diode.jpg


They are yours if you want them.

73, Ed. EI9GQ.


Ed, could you contact me off-list please. I have a couple of
questions to ask. My e-mail follows in suitable munged-up fashion.

r c n i x o n (at) m*i*n*d*s*p*r*i*n*g (dot) c&o&m

Just remove the obvious characters.

Thanks,

Russ - kf4wxd
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Old September 2nd 05, 09:12 AM
Eamon Skelton
 
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Default

On Fri, 02 Sep 2005 01:46:57 +0000, Russ wrote:


Ed, could you contact me off-list please. I have a couple of questions to
ask. My e-mail follows in suitable munged-up fashion.

r c n i x o n (at) m*i*n*d*s*p*r*i*n*g (dot) c&o&m


Hello Russ,

Thats the most munging I have ever seen in an
e-mail address. Remove the leading X from my From:
address. User: nospam Domain: oceanfree.net

73, Ed. EI9GQ.

--
linux-2.6.13
Remove 'X' to reply by e-mail.



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Old September 2nd 05, 09:23 PM
Pete KE9OA
 
Posts: n/a
Default

Hey John,
An HP1N5711 diode should do the trick. I sent a few to a fellow in Canada
some months back that had a blown 1st mixer in his 8558. I have about 150 on
hand and I would also be glad to send a few your way.

Pete

"Eamon Skelton" wrote in message
news
On Fri, 02 Sep 2005 01:46:57 +0000, Russ wrote:


Ed, could you contact me off-list please. I have a couple of questions
to
ask. My e-mail follows in suitable munged-up fashion.

r c n i x o n (at) m*i*n*d*s*p*r*i*n*g (dot) c&o&m


Hello Russ,

Thats the most munging I have ever seen in an
e-mail address. Remove the leading X from my From:
address. User: nospam Domain: oceanfree.net

73, Ed. EI9GQ.

--
linux-2.6.13
Remove 'X' to reply by e-mail.





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