[time-nuts] HP 3586A/B/C entirely referenced to 10MHz: A solution II
WB6BNQ
wb6bnq at cox.net
Fri Apr 1 04:48:55 UTC 2011
Perrier,
Your simple idea is a non workable concept. Instead of whining about the complexity, why not contact Bert or Paul Swed and see if one of them would do you a favor and build the item for you. I do not believe the hookup part is that hard to do and if You follow instructions well it should be quite doable.
Bill....WBBNQ
Perry Sandeen wrote:
> Fellow Listers,
>
> Please read and think a bit about my comments before rushing to the reply button. The comments are meant to be technical.
>
> When Burt VE2ZAZ posted his HP 3586A/B/C entirely referenced to 10MHz: A solution, I was drooling with envy to add it to my units. However, after reading what it took to make and program it I was completely deflated.
>
> While there are those on the list with extensive educational and technical resources, Burtâs project may be just fine. And for those who can make it, go for it. I made a pros and cons list.
>
> Advantages Dis-advantages
> Small- Will fit inside case SMD Components
> Low power requirements Needs Programming
> Inexpensive Program varies for various models
> Awesome build quality Almost comes up with the correct numbers
>
> Sometimes the only way to solve a problem is with SMDâs, programmed devices etc. But I suspect that for most of us âsolutionsâ of this type are really impractical. Some posts seem to suggest that everyone can program devices, write code, and can work with SMDâs as easily as getting a hamburger at Micky Dâs. It just ainât so. On my level I have to use the KISS principle.
>
> Several alternative methods:
>
> The cheap method. Turn the crystals 90 degrees so they are perpendicular to the PC board. Make a simple TL431 temperature regulated circuit (I found it on the web by a google search) with a bit of copper and insulation. A small supplemental adjustable tuning capacitor and/or varicap circuit may be needed. It will probably get one as close as the original programmed mod IMHO.
>
> The high priced exact solution. Use a HP 3336 locked to the same external standard one is using for the HP 3586B. Remove the original crystal circuit and inject the exact number one needs and get the exact results without any dithering.
>
> Iâm blessed to have almost all the test equipment, or its equivalents, mentioned on this list sans a spectrum analyzer and from postâs that I have read Iâm way ahead of many of the members.
>
> Iâve been very impressed, and have learned a great deal, with the posts on the Tâbolts, answers to my posted qurstions, WWVB, and HP oscillator fine tuning tips to name a few.
>
> On subjects over, or in many cases way over, my head I just read and delete but others find them both fascinating and useful and thatâs just fine.
>
> Regards,
>
> Perrier
>
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