No problem, always glad to be of help to those in need.
73 es HH, Dick, W1KSZ
On 12/2/2014 2:27 PM, John Ackermann N8UR wrote:
Thanks for the kind words, Dick. :-)
However, a couple of notes on the TADD-1 bandpass filter:
1. I *don't* recommend installing it unless there is a good reason.
As others have noted, any tuned circuit is a thermometer and will
degrade ADEV performance. Other than the original test unit, I
haven't built the filter into any of the several TADD-1s I've deployed
in my lab.
2. The component values for the example filter in the TADD-1 manual
are wrong. I haven't gotten around to fixing that, mainly because of
point 1.
And since the topic of isolated grounds has come up: the TADD-1 uses
transformer isolation on each input and output, and provides DC
isolation by putting a 10nf cap between ground and the coax shield
(with a very short path). This seems to have worked pretty well for
most users.
John
----
On 11/27/2014 11:41 AM, Richard Solomon wrote:
If you want to see how to really do it right, check out this
distribution Amp
on the TAPR site.
https://www.tapr.org/kits_tadd-1.html
73, Dick, W1KSZ
On 11/26/2014 9:08 PM, Perry Sandeen via time-nuts wrote:
List,
I have seen on the net a 10 MHz filter using 10.7 IFtransformers but
have no idea how well they would work for isolation with thenew style
Lucent boxes.
Thoughts?
On Ebay venders are offering 10 MHz crystals for almostnothing if you
buy 30. My question wouldthese be good for making some type of simple
ladder filter?
In his article *Modifying Lucent RFG-M-RB Rubidium FrequencyStandard*
the author used a 10MHz filter that was taken from an old
10MbitEthernet LAN board. The part number he used was 20F001N and I
found them onEbay for low prices.
Now I don’t have any access to any old ethernet LAN boardsso I’d have
to build from scratch.
Does anyone of these methods have an advantage over theothers on the
new style Lucent boxes or in the making of a small
distributionamplifier with good isolation?
Regards,
Perrier
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