[time-nuts] 10 MHz Filters
w1ksz at earthlink.net
Tue Dec 2 18:01:51 EST 2014
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.
> 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.
>> 73, Dick, W1KSZ
>> On 11/26/2014 9:08 PM, Perry Sandeen via time-nuts wrote:
>>> 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.
>>> 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?
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