Re: MLA-30+, the story continues!

Everett N4CY All Messages By This Member #20275 The is the original built as per circuit on line using 2N2222 transistors ? LZ1AQ Loop amplifier, with 2N2222 Transistors. The Orginial LZ1AQ at 13.8VDC @130mA has an IMD of (OIP2) 1 MHz +77.1 dBm, 7 MHz +85.2 dBm. (OIP3) 2 MHz +38.5 dBm, 5 MHz +37.5.35 dBm In a message dated 10/6/2024 1:53:20 PM Central Daylight Time, everettsharp@... writes: ? toggle quoted message Show quoted text This is what a LZ1AQ amp is with 2SC5551 transistors. ? ?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 ? Everett N4CY In a message dated 10/6/2024 12:52:06 PM Central Daylight Time, martin_ehrenfried@... writes: ? Hi Leong, ? Good work, but the LZ1AQ IOP3 looks far too low. ? It is quoted as being ? 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 ? Looking back at my results, the best I could manage to measure was:- ? OIP2 +74dBm OIP3+42dBm ? My normal sanity check is to check that the IOP3 is typically 10 to 15dB higher than the P1dB value. ? What's your test setup, and how do validate it ? ? Regards, ? Martin

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