[Hammarlund] Re: Sweep Method for Alignment (explain?)

[Julian Bunn]

Hi Ken et al,

I was away for a couple of days, but have been watching this thread with 
interest.

Regarding the merits of slower sweep speeds, I did a check today, 
comparing the
IF response curve when sweeping at 1ms, 100ms, 1s and 10s ... there was no
discernible difference at all.

Indeed, since the time constant of the IF must be around 1/455kHz i.e. about
2 microseconds, the system must charge up in much less time than 1ms. So 
I don't
understand why ringing would be a problem - have I misunderstood?

There is a design for an IF Wobbulator in one of the old copies of 
"Practical Wireless"
I have from the 60s, which I could scan in and send to people who are 
interested.
I don't want to put it on my web site as I suspect I'd be infringing 
some copyright :-)

Julian


Kenneth G. Gordon wrote:

>On 8 Apr 2006 at 13:14, Kenneth G. Gordon wrote:
>
>  
>
>>> My HP8640B has FM capability
>>>down to 5 khz deviation.  Any thoughts on this method to accomplish
>>>the same thing?
>>>      
>>>
>>I am glad you mentioned that. I have an HP-8640B also. As far as I
>>remember, doing what you suggest is perfectly suitable and works at
>>least as well as using a separate sweep generator.
>>    
>>
>
>I should have added here: "...provided the SG has a sawtooth output to 
>drive the scope's horizontal sweep in synchronism with the SG's 
>FMing."
>
>Ken W7EKB
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