Dave,
Since that "coupler" has only one output, it is not a full forward and
reverse coupler, so it could be nothing more than a toroid output with
the wire carrying the full output going through the center of the core -
in other words, it can just be an "RF Sampler", and in that case it
would not have to be placed in a place where the load is 50 ohms.
I think there will be more information to come about its function. For
the time being, it is safe to assume it is not a calibrated output, but
simply a tap to observe the output waveform, rather than an amplitude
measuring device.
73,
Don W3FPR
On 3/23/2018 2:14 PM, David Box wrote:
Don
Was fairly certain that units were used incorrect but ya' never know
so appreciate confirmation.
Wanting to get linearity test ready so now I know what is needed to
set up. I always want to monitor a new amp and the inclusion of this
output allows that.
Now I do have one other "assumption" and that is the coupler is before
the internal ATU so it is always working with a 50 ohm load, hopefully
that is correct.
73
Dave K5MWR
On 3/23/2018 10:23 AM, Don Wilhelm wrote:
David,
It is just a coupler - nothing else makes sense for that use, so your
-60dB assumption is correct. Yes, it is relative to the output, so
dBm is not the proper designation.
73,
Don W3FPR
On 3/23/2018 10:09 AM, David Box wrote:
I am trying to get ready for delivery of the KPA1500 and have become
confused about the information available for the TX Sample port.
The only information I can find states that this is a low-level
signal of -60dBm but dBm is a measure of absolute power which would
put this signal at 1 nanowatt.
My first thought is that this is a typo and meant to show that the
signal level on the port is -60dB with respect to output but need
some verification.
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