[Elecraft] KPA1500 TX Sample

[Don Wilhelm]

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.
>>
>>
>
>