[Amps] IM distortion and such

[Will Matney]

Tony,

Thanks as mine is a little different than this one (1973 version), as yours shows the driving power. The one in my manual does not. The link was from another poster on  here, I was merely referencing it. I wondered why it only showed class B. The one in my manual doesn't mention class B at all.

Best,

Will

*********** REPLY SEPARATOR  ***********

On 6/27/06 at 7:26 PM Tony King wrote:

>Will,
>
>The PDF that you sent the link for is a 1968 revision. The attached 
>sheet is a 1980 revision. They're different.
>
>73, Tony W4ZT
>
>Will Matney wrote:
>> Ok,
>> 
>> I went and pulled my Eimac book down. I hadn't earlier where it was at
>as I couldn't hardly reach it from my wheelchair.
>> I guess I need shorter book shelves : ) Anyhow, this one does have the
>Class AB2 listed as below from page 2. Strangely, this one does not
>mention class B like the pdf did.
>> 
>> Quote;
>> 
>> Radio frequency Linear Amplifier
>> Cathode driven
>> Class AB2
>> 
>> Maximum Ratings:
>> 
>> DC plate voltage 4000 Vdc
>> DC plate current 0.4 ampere
>> Plate dissapation 500 watts
>> Grid dissapation 20 watts
>> 
>> Typical operation (Frequencies to 110 MHz)
>> Class AB2, peak envelope or modulation crest conditions
>> 
>>>> (Here I'm going to show the maximum plate voltage they show of 3500
>Vdc)
>> 
>> Plate voltage 3500 Vdc
>> Cathode voltage +15 (+10 at 3000 and 0 at 2500)
>> Zero signal plate current 53 mA
>> Single-tone plate current, CW 3/4 400 mA
>> Two-tone plate current 262 mA
>> Single-tone grid current  108 mA
>> Two-tone grid current 58 mA
>> Single-tone power input 1400 W
>> Useful output power, CW or PEP 890 W
>> Resonant load impedance 5000 ohms
>> Intermodulation distortion products;
>> 3rd order -40 dB
>> 5th order -45 dB
>> 
>> Single-tone current for 3500 Vdc operation may reach this value during
>short periods of circuit adjustment only.
>> 
>> IMD products are referenced against one tone of a two equal tone signal.
>> 
>> Currents listed corrospond to SSB, or "two-tone" average current at peak
>of signal envelope.
>> 
>> End Quote.
>> 
>> Best,
>> 
>> Will
>> 
>> 
>> 
>> *********** REPLY SEPARATOR  ***********
>> 
>> On 6/27/06 at 1:31 PM R L Measures wrote:
>> 
>>> On Jun 27, 2006, at 6:51 AM, Will Matney wrote:
>>>
>>>> Rich,
>>>>
>>>> It was the same thing as they printed it I was refering, or to me  
>>>> it was as I wrote it. It was Eimacs maximum rating at 1 KW input, G- 
>>>> G, class B RF amp showing it's minimum distortion, or the way they  
>>>> have it listed.
>>> I have seen no info from Eimac on Class B for the 3-500Z.
>>>> Best,
>>>>
>>>> Will
>>>>
>>>> *********** REPLY SEPARATOR  ***********
>>>>
>>>> On 6/27/06 at 6:19 AM R L Measures wrote:
>>>>
>>>>> On Jun 27, 2006, at 2:46 AM, Tom W8JI wrote:
>>>>>
>>>>>>> They can be used on up in current, say for pulse circuits
>>>>>>> and RF heating. The 400 mA is the maximum plate current at
>>>>>>> single tone for minimum distortion. That's for 600 watts
>>>>>>> PEP useful power each. That's listed in the tables on page
>>>>>>> 2 or 3 under a class B RF amp.
>>>>>> Will,
>>>>>>
>>>>>> Where did you get the idea 400mA is a "minimum distortion"
>>>>>> condition?
>>>>> Good point, Tom.  Will should have said something like:  for minimal
>>>>> distortion, the max rated anode-I is 400mA.
>>>>>> 73 Tom
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> _______________________________________________
>>>>>> Amps mailing list
>>>>>> Amps at contesting.com
>>>>>> http://lists.contesting.com/mailman/listinfo/amps
>>>>>>
>>>>> R L MEASURES, AG6K. 805-386-3734
>>>>> r at somis.org
>>>>
>>>>
>>>> _______________________________________________
>>>> Amps mailing list
>>>> Amps at contesting.com
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>>>>
>>> R L MEASURES, AG6K. 805-386-3734
>>> r at somis.org
>> 
>> 
>> 
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