[time-nuts] ks... answers The emails are getting long

Bob Camp kb8tq at n1k.org
Thu Nov 20 17:55:02 EST 2014


> On Nov 20, 2014, at 7:45 AM, Jim Lux <jimlux at earthlink.net> wrote:
> On 11/20/14, 4:04 AM, Bob Camp wrote:
>> Hi
>> As I recall, the whole LH series was a multi chip rather than
>> monolithic IC approach. Even back in the day, that made them
>> expensive parts. There are other parts that make fine 10 MHz buffers
>> that only cost a dime.
>> Bob
> Isn't that the significance of the LH.. Linear Hybrid vs LM - Linear
> Monolithic

In some cases the “hybrid” only meant more than one chip. It did not always include the stuff that I’d consider to make it a full thick film or thin film circuit. 

> I don't recall seeing many single parts in the 80s for a dime that could

The topic at hand started out as driving 10 to 20 dbm into a 50 ohm load at 10 MHz. Even with reasonable constraints on phase noise and ADEV, you can do that for about a dime in semiconductors. 

> drive a big inductive load at tens of MHz.
> Today, I think that would still be a challenge, but certainly, we've got a lot more alternatives available.

Which is why I’d save these neat old beasts for places where they really truly are needed. 


>>> On Nov 19, 2014, at 9:00 PM, Jim Lux <jimlux at earthlink.net> wrote:
>>> Interesting parts.. They aren't kidding when they say you need good
>>> power supply bypassing and decoupling.(a comment that is in the 84
>>> book but not the 75 version) I'm trying to remember what I was
>>> using them for: driving a YIG tuning coil in a phase locked loop, I
>>> think, but it might have been driving a fast RF switch.
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