This sounds like a shield is not connected , or broken on one of the
distribution cables.
The 10 MHz will not appreciably leak from half decent coax properly
terminated.
The 10 MHz should not be detectable unless a wire is coupled directly on
the coax braid.
That assumes the 10 MHz source itself is well shielded and all wires
that enter or exit are firewalled .
is this an attempt to distribute square or sine wave 10 MHz ?
-glen
On 14/07/2019 2:53 AM, Jerry O. Stern wrote:
I have been using a Tbolt and TAPR TADD-1 for a few years, mainly as an
external reference source for my workbench equipment. Just got a SDR radio
kit (Ubitx) and trying to calibrate the local oscillators found this
annoying substantial 10MHz signal heterodyning with the LO's (45MHz and
12MHz). Taking a look on my SA with just a broad band telescopic antenna
in the SA input, I see a 10MHZ at about -55 dBm and no other signals > -120
dBm. The Tbolt is about 4-5' away from the workbench BUT I disconnected
everything and it is only connected to the TADD-1 distribution amplifier
The TADD has no distribution coaxes attached, it is in the TAPR metal
cabinet which I always thought was well shielded and every port has been
terminated with 50 Ohm dummy load plugs. When I take the TADD-1 out of the
equation and just run the Tbolt into a 50 ohm termination plug, the 10MHz
signal on my SA drops down to > -90 dBM. I duplicated this with a
Lucent RFTGm-Xo/Rb pair and the TADD-1 with similar results. Has anyone
else seen this with their distribution amp?
Jerry
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