[600MRG] EIRP

[Jim Miller]

I'm not planning on waiting for the FCC. I'm just planning carefully so I
don't overcommit myself and also so I don't apply incorrectly that causes
me problems.

I also want to make sure I've got my 160 DXCC accomplished before I start
messing with my antenna.

I've already started building my RX up converter for 630m which will feed
my K3. I've also acquired a 10Mhz GPSDO and DEMI splitter to feed all the
various bits. Once I decide what and how to build my TX down converter I'll
have plenty of info to make the application.

I was more just musing about the complexity of ensuring compliance with an
emission specification that is more than "watts out."

Of course I can do the testing and analysis needed, especially with the
help of this group!

Thanks

Jim ab3cv

On Tue, Jan 27, 2015 at 4:56 PM, Warren K2ORS <k2ors at verizon.net> wrote:

> Jim,
>
>    Don't hold your breath waiting for the FCC to grant an amateur
> allocation. The framework was established at WRC 2012 3 years ago and more
> than 2 dozen countries have amateur allocations, no word on when the FCC
> might consider it other than they would like to get the 137kHz amateur
> allocation issue cleared first (likely they will deny it based on
> overwhelming power industry opposition).
>
>    The ARRL 500kHz license was first applied for in 2004 (issued 2005),
> since that time approximately 10% of the WD2XSH licensees have passed away,
> half of SK's never got on the air.
>
>     It's possible that one could die of old age before the FCC acts on
> 500kHz, and there is no guarantee that if they act they will create an
> amateur allocation; its about a 50-50 chance IMO.
>
> 73 Warren
>
>
>
> On 1/27/2015 4:27 PM, Jim Miller wrote:
>
>> I wonder how this will all sort out? How many hams will buy or build an RF
>> ammeter and go through all the calculations to stay within legal limits?
>>
>> 73
>>
>> Jim ab3cv
>>
>>
>>
>> On Tue, Jan 27, 2015 at 1:55 PM, Eric NO3M <no3m at no3m.net> wrote:
>>
>>  An additional reference from FCC: https://apps.fcc.gov/eas/
>>> comments/GetPublishedDocument.html?id=204&tn=255011
>>>
>>> WRC-2012 and most countries are defining 630M power limits in terms of
>>> EIRP, and most likely, also the FCC when they get around to it. However,
>>> many experimenters in the US refer to their power in terms of ERP.
>>> Therefore, what is claimed as 5W ERP is 8.2W EIRP.
>>>
>>> ERP = EIRP / 1.64
>>> EIRP = ERP * 1.64
>>>
>>> (per definition, ideal dipole [free-space?] has 2.15 dBi gain over
>>> isotropic radiator, or 1.64 numerical gain).
>>>
>>> So, if you are running 5W ERP, cut it back to 3W ERP to get 5W EIRP.
>>>
>>> This all begs the question..... does anyone really know what power
>>> they're
>>> running other than what's coming out of the final amplifier stage?!?  I'm
>>> sure most of pretty darn close though.
>>>
>>> 73 Eric NO3M / WG2XJM
>>>
>>>
>>> On 01/27/2015 01:24 PM, Rudy Severns wrote:
>>>
>>>  Ed raised a question on my calculation of EIRP to Pr, radiated power.
>>>> According to Fritz's note on the standard definitions ERP is defined
>>>> with
>>>> a
>>>> different reference from EIRP!  ERP is referenced to a "dipole" in free
>>>> space while EIRP is referenced to an "isotropic" radiator.  I find that
>>>> distinction bizarre but from Fritz's note that appears to be what the
>>>> FCC
>>>> has done.  Neil's (XSV) posting last week on this subject has not only
>>>> the
>>>> calculations but Fritz's original note.  If you think Fritz's
>>>> interpretation
>>>> is wrong now would be great time to sort it out.  A couple of weeks ago
>>>> I
>>>> misinterpreted it, using an elaborate explanation, and bought us an
>>>> extra
>>>> 3
>>>> dB.  It was very disappointing to lose that.
>>>>
>>>>
>>>> 73, Rudy
>>>>
>>>>
>>>>
>>>>
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