[time-nuts] TAPR TICC and TADD-2 Minis

[Bob kb8tq]

Hi

There’s a lot more to setting this stuff up past the basics. Not all
attenuators have good return loss …. (and on and on). This quickly
gets pretty far of topic for Time Nuts. Simply keep in mind that the
measurement gear and measurement technique very much get 
into the results of almost anything you look at ….

Bob

> On Jun 2, 2020, at 1:18 PM, Frank O'Donnell <time at inkbox.net> wrote:
> 
> On 6/1/20 9:11 AM, Bob kb8tq wrote:
> 
>> Scope basics:
> 
> 
> Thanks for the comments. Very helpful as background beyond this immediate project.
> 
> 
>> A 10 db pad ahead of the feed through is another way to deal with this. It should at
>> lest get you into the 20 db return loss range.
> 
> 
> I have a nice JFW variable attenuator, and inserted it between the TADD-2 Mini and the scope to capture the Thunderbolt's 10 MHz signal converted to square wave with 0, 3, 6, 10 and 20 dB attenuation. Screen shots are attached (very small, but there are five of them).
> 
> 
> 
>> One of the reasons there are compensated scope probes is to get around this
>> issue. There are a variety of them out there with a range of capabilities. Yes, the
>> fancy fet probes cost more than something simple ……. 
> 
> 
> Currently the only probes I have is the stock pair that came with the Siglent digital scope (an SDS1202?X-e). I also recently bought a vintage Tektronix T922 analog scope, but it didn't include probes. Thus I might be in the market for a good set of probes. If there are suggestions for any that aren't more expensive than, say, a T922 or a used Thunderbolt, I'd be very interested.
> 
> 
> Thanks again,
> 
> Frank
> 
> <tadd2mini-50ohm-0db.png><tadd2mini-50ohm-3db.png><tadd2mini-50ohm-6db.png><tadd2mini-50ohm-10db.png><tadd2mini-50ohm-20db.png>_______________________________________________
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