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#1
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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 |
#2
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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 |
#3
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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. -- linux-2.6.13 Remove 'X' to reply by e-mail. |
#4
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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 |
#5
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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. |
#6
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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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