Power dB = 10LOG*(P1/P2).
Question #1, do you have a calibrated volt meter? Might be useful to check your
input voltage.
Question #2, is your "50 ohm load" calibrated?
Question #3, I am not familiar with the Motorola Comm Analyzer... Is it rated
for HF freq's? It is my impression that the Motorola stuff is mostly VHF/UHF
rated equipment.
Peace,
Don Jones ko7i
Arlington, WA
-----Original Message-----
From: Mike Bryce [mailto:prosolar@sssnet.com]
Sent: Friday, April 01, 2011 6:37 PM
To: Discussion of Ten-Tec Equipment
Subject: Re: [TenTec] eagle
I have access to a very expensive motorla comm analyzer. $50k, calibrated to
traceable standards.
My personal coaxial dynamic watt meter and if course a 50 ohm dummy load.
So, I am not using an old radio shack CB watt meter, but calibrated RF test
equipment.
Mike
Sent from my iPhone
On Apr 1, 2011, at 8:59 PM, Richards <jruing@ameritech.net> wrote:
> Hi Mike --- I fully sympathize with your point in your position. I
> agree the rig should be as advertised.
>
> As I wrestle with the issue, myself – considering the tolerance issues
> and the fact that meters don't really show full power necessarily, ...
> I'm wondering how do you (i.e., we) know you (we) are only getting 85
> W out when it is set for 100 W out ? If our meters are not fully
> accurate, how do we know we are not getting something like 95 – 100 W
> out when our meters say 85 – 90 W with a 10% accuracy swing?
>
> I'm not picking a fight and I'm not doubting you – I'm only wondering
> how you reached the conclusion you are not getting 100 W as advertised.
> How did you test your rig to demonstrate you are not really getting
> the full output?
>
> ------------------
> Happy Trails.
> ======================= Richards / K8JHR =========================
>
> On 4/1/2011 8:02 PM, Mike Bryce wrote:
>> I'll keep this short as two thumb typing is hard to do.
>>
>> I understand the electronic aspect of it as well as the tolerance and
>> logarithm of real power in the real world.
>>
>> Please, please, please understand I KNOW that no one on the other end will
>> know the difference.
>>
>> But, I paid almost $3000 for a radio that displays on the front panel 100
>> watts output when the real power into a dummy load @13.9 volts @ the radio
>> power connection I have 76 watts on 20 meters out of the box brand spanking
>> new.
>>
>> This is NOT a 'simple adjustment-- no one will notice' problem.
>>
>> No one, not me, not you, should pay three grand and then need to crack the
>> case open to adjust anything.
>>
>> This is not a 'no one can tell the difference problem,' this is a quality
>> control problem.
>>
>> If the display on my brand new $3k Omni 7 says 100 watts, then by god the
>> power output should be "close."
>>
>> 85 watts is fine, but the display should reflect the rf output of 85 watts
>> (not lab gear, I know)
>>
>>
>> With sore thumbs,
>>
>> Mike
>>
>> Sent from my iPhone
>>>
>>>
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>>
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