Re: [time-nuts] HP 4193A 4815A probe compatibility?

2013-10-18 Thread Poul-Henning Kamp
In message 5045fb99932bb62b54dea2c4ec301...@sonic.net, Richard Karlquist writes: These days, you can buy a decent power detector chip from Analog Devices (possibly on an evaluation board) and maybe you don't need a power meter. I've played with one of those, and if you want to do anything but

Re: [time-nuts] HP 4193A 4815A probe compatibility

2013-10-18 Thread Al Wolfe
There are many detector chip out there. The venerable AD8307 with greater than 80 db dynamic range goes from almost DC to 700 mhz. Linear Technology has several currently listed. Their LTC5508 covers 300 to greater than 7 GHz. Al On Oct 17, 2013, at 3:38 PM, Richard Karlquist

Re: [time-nuts] HP 4193A 4815A probe compatibility

2013-10-18 Thread Bob Camp
Hi The gotcha is that a true thermal converter takes care of a bunch of odd issues. Other approaches really don't cover all the bases. How any of this relates to TimeNuts is a bit beyond me ... Bob On Oct 18, 2013, at 1:12 PM, Al Wolfe alw.k...@gmail.com wrote: There are many detector chip

Re: [time-nuts] HP 4193A 4815A probe compatibility

2013-10-18 Thread Kenton A. Hoover
Kenton A. Hoover liked your message with Boxer. On Fri, Oct 18, 2013 at 15:10, Bob Camp wrote:HiThe gotcha is that a true thermal converter takes care of a bunch of odd issues. Other approaches really don't cover all the bases.How any of this relates to TimeNuts is a bit beyond me ...BobOn Oct

Re: [time-nuts] HP 4193A 4815A probe compatibility?

2013-10-17 Thread Mark Kahrs
. Thanks; Thomas Knox From: saidj...@aol.com Date: Wed, 16 Oct 2013 15:22:13 -0400 To: time-nuts@febo.com Subject: Re: [time-nuts] HP 4193A 4815A probe compatibility? Hi Rick, Tom, one little bit of knowledge I learned: I like the HP 54701A FET probes for frequency-domain stuff

Re: [time-nuts] HP 4193A 4815A probe compatibility?

2013-10-17 Thread Said Jackson
changes when not being used on a O-Scope as a voltage probe. Thanks; Thomas Knox From: saidj...@aol.com Date: Wed, 16 Oct 2013 15:22:13 -0400 To: time-nuts@febo.com Subject: Re: [time-nuts] HP 4193A 4815A probe compatibility? Hi Rick, Tom, one little bit of knowledge I learned: I like

Re: [time-nuts] HP 4193A 4815A probe compatibility?

2013-10-17 Thread paul swed
changes when not being used on a O-Scope as a voltage probe. Thanks; Thomas Knox From: saidj...@aol.com Date: Wed, 16 Oct 2013 15:22:13 -0400 To: time-nuts@febo.com Subject: Re: [time-nuts] HP 4193A 4815A probe compatibility? Hi Rick, Tom, one little bit

Re: [time-nuts] HP 4193A 4815A probe compatibility?

2013-10-17 Thread Richard Karlquist
On 2013-10-17 08:34, paul swed wrote: However homebrewing replacements is of interest. My experience is with the HP power meters. I have a number of working units. But darned if the meters no probes or cables show up for a few dollars at fleas. So last fall I built home brew bolometers. By god

Re: [time-nuts] HP 4193A 4815A probe compatibility?

2013-10-17 Thread Steve Byan
On Oct 17, 2013, at 3:38 PM, Richard Karlquist rich...@karlquist.com wrote: If you are below 80 MHz, Linear Technologies makes a thermal power meter on a chip. Alas, the LT1088 is no longer made. http://www.linear.com/product/LT1088 Best regards, -Steve -- Steve Byan steveb...@me.com

Re: [time-nuts] HP 4193A 4815A probe compatibility?

2013-10-17 Thread Jim Lux
On 10/17/13 4:46 PM, Steve Byan wrote: On Oct 17, 2013, at 3:38 PM, Richard Karlquist rich...@karlquist.com wrote: If you are below 80 MHz, Linear Technologies makes a thermal power meter on a chip. Alas, the LT1088 is no longer made. http://www.linear.com/product/LT1088 Rochester

[time-nuts] HP 4193A 4815A probe compatibility?

2013-10-16 Thread Tom Knox
I hope this is not to far off topic. Does any one know if the 4193A and 4815A probe are physically interchangeable and electronically compatible? If not does anyone know the differences and how to identify which is which? If you feel this is to far off topic please contact me directly. Thanks

Re: [time-nuts] HP 4193A 4815A probe compatibility?

2013-10-16 Thread Richard Karlquist
The 4815A used P channel FETs which were available 50 years ago and are now unobtainium. The 4193A used N channel FETs which were available 10 to 30 years ago and may even be currently available. They are DEFINITELY NOT INTERCHANGEABLE. This is according to ex-HP'er George Standford, who used

Re: [time-nuts] HP 4193A 4815A probe compatibility?

2013-10-16 Thread SAIDJACK
Hi Rick, Tom, one little bit of knowledge I learned: I like the HP 54701A FET probes for frequency-domain stuff. Available for $300 on Ebay sometimes. I built a small power supply for one of mine, and use it as a probe for my Spectrum analyzer and scopes. Almost indestructable. It

Re: [time-nuts] HP 4193A 4815A probe compatibility?

2013-10-16 Thread Tom Knox
. Thanks Again. Thomas Knox Date: Wed, 16 Oct 2013 11:16:27 -0700 From: rich...@karlquist.com To: time-nuts@febo.com Subject: Re: [time-nuts] HP 4193A 4815A probe compatibility? The 4815A used P channel FETs which were available 50 years ago and are now unobtainium. The 4193A used N channel

Re: [time-nuts] HP 4193A 4815A probe compatibility?

2013-10-16 Thread Tom Knox
: [time-nuts] HP 4193A 4815A probe compatibility? Hi Rick, Tom, one little bit of knowledge I learned: I like the HP 54701A FET probes for frequency-domain stuff. Available for $300 on Ebay sometimes. I built a small power supply for one of mine, and use it as a probe for my Spectrum