[time-nuts] TAPR Announces TADD-1 Distribution Amplifier

David G. Andersen dga+ at cs.cmu.edu
Mon Nov 21 23:00:43 EST 2005

This is great, John - thanks for designing it.

Isn't that MAX477 convenient? :)  The only drawback to it, from my
view, is that it's got too much bandwidth from all those weird "video"
applications (who wants video when you can play with 10Mhz GPSDOs?),
leading to the possibility of harmonics on the output.  And conveniently,
the TADD-1 seems to have a 10Mhz bandpass filter... nice.

Curious about one thing - you provided spots for an input bandpass
filter, but nothing on the outputs.  How do the output harmonics look
when amplifiying a clean 10Mhz input signal?

[CC: list trimmed to just time-nuts]


On Mon, Nov 21, 2005 at 02:11:55PM -0500, John Ackermann N8UR scribed:
> TAPR is pleased to announce the immediate availability of the TADD-1 RF 
> Distribution Amplifier kit.
> The TADD-1 is a six channel RF distribution amplifier.  Its primary use 
> is to allow a single frequency source (e.g., a GPS disciplined 
> oscillator) to drive the "external reference" input of several test 
> instruments.  The usable frequency range is 200kHz to 30MHz, and the 
> maximum signal output level into 50 ohms is 2.75 volts peak-to-peak, or 
> about +12dBm.  The maximum high-impedance output is 5 volts peak-to-peak.
> To minimize ground loops in sensitive test applications, the input and 
> each of the six outputs is transformer coupled and DC blocked.  RF 
> connectors are ground-isolated BNC.  A jumper allows the input to be 
> terminated in 50 ohms, or to present a high impedance.  An optional 
> bandpass filter can be installed to reduce spurious responses.
> The 12 volt power input is fused and protected against reverse polarity. 
>  Current drain depends on the number of loads and ranges from 50 to 150ma.
> The RF and DC inputs are arranged so that two (or more) TADD-1 boards 
> can be stacked, sharing common RF and DC inputs.
> The TADD-1 kit is priced at $99 for TAPR members ($109 for non-members) 
> and is shipping now.  Assembled and tested versions may be available at 
> a later date; contact the TAPR office for details.
> For more information about the TADD-1, or to place an order, go to 
> http://www.tapr.org/kits_tadd-1.html or send email to tapr at tapr.org.
> (Note: the order page is currently being updated; if it still says 
> "Price TBD", please try again later.)
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Dave Andersen                                 dga at cs.cmu.edu
Assistant Professor                           412.268.3064
Carnegie Mellon University                    http://www.cs.cmu.edu/~dga

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