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Re: MLA-30+, the story continues! #Small_receiving_loops_RX-only

 

This is what a LZ1AQ amp is with 2SC5551 transistors.

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?The Improved LZ1AQ at 13.8VDC @120mA has an IMD of (OIP2) 1 MHz +98.4 dBm, 7 MHz +93.8 dBm. (OIP3) 2 MHz +42.2 dBm, 5 MHz +40.35 dBm

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Everett N4CY


In a message dated 10/6/2024 12:52:06 PM Central Daylight Time, martin_ehrenfried@... writes:
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Hi Leong,
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Good work, but the LZ1AQ IOP3 looks far too low.
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It is quoted as being
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1 dB output compression point(9) +19dBm (5.6 V p-p), equal to +125 dB(uV/m) at input
Second harmonic OIP2(7) +82dBm to +105dBm
Third harmonic OIP3(8) +41dBm to +42dBm
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Looking back at my results, the best I could manage to measure was:-
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OIP2 +74dBm
OIP3+42dBm
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My normal sanity check is to check that the IOP3 is typically 10 to 15dB higher than the P1dB value.
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What's your test setup, and how do validate it ?
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Regards,
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Martin
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