While all of the info is correct, I also like to mention that an inline station
monitor is also a great device. I use a old Kenwood SM-220 as a permenant part
of the station. That lets me see the RF amplitude and the linearity of the
signal. The trapozoid is used mostly to keep tabs on any hint of distortion.
Lots of info on its use.
Mel, K6KBE
From: Don Wilhelm <donw...@embarqmail.com>
To: David Box <do...@suddenlink.net>; Elecraft@mailman.qth.net
Sent: Friday, March 23, 2018 11:37 AM
Subject: Re: [Elecraft] KPA1500 TX Sample
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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