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The ERF7530 as used in the RFX-75 add-on amplifier would show between 75 and 100 Watts PEP.

The size of the heat sink made a carrier power much over 15 Watts a bad idea.

Considering that the manufacturer called their two-transistor version the '150' leads me to suspect that 75 Watts apiece was what they felt confident claiming.

I suspect that the difference in power from the RFX75 had more to do with variations in the type of radio it was used on.

The RFX75 has a ERF2030 (disguised IRF520) inside, driving the ERF7530. Not sure just what power the 2030 pumped into the 7530, but I'll guess it was around one-fourth the module's peak output power.

Probably ought to take a derelict RFX75 and configure it to test possible substitute parts.

TIme to order some IRFP240 and 250 parts to try that way. Comparing the specs of the two is a bit confusing. Gotta learn how to apply "gate charge" and "rise time" to RF-power gain.

73

<blockquote data-quote="nomadradio" data-source="post: 599564" data-attributes="member: 22">The ERF7530 as used in the RFX-75 add-on amplifier would show between 75 and 100 Watts PEP.The size of the heat sink made a carrier power much over 15 Watts a bad idea. Considering that the manufacturer called their two-transistor version the &#039;150&#039; leads me to suspect that 75 Watts apiece was what they felt confident claiming. I suspect that the difference in power from the RFX75 had more to do with variations in the type of radio it was used on. The RFX75 has a ERF2030 (disguised IRF520) inside, driving the ERF7530. Not sure just what power the 2030 pumped into the 7530, but I&#039;ll guess it was around one-fourth the module&#039;s peak output power. Probably ought to take a derelict RFX75 and configure it to test possible substitute parts. TIme to order some IRFP240 and 250 parts to try that way. Comparing the specs of the two is a bit confusing. Gotta learn how to apply &quot;gate charge&quot; and &quot;rise time&quot; to RF-power gain. 73</blockquote>

[QUOTE="nomadradio, post: 599564, member: 22"] The ERF7530 as used in the RFX-75 add-on amplifier would show between 75 and 100 Watts PEP. The size of the heat sink made a carrier power much over 15 Watts a bad idea. Considering that the manufacturer called their two-transistor version the '150' leads me to suspect that 75 Watts apiece was what they felt confident claiming. I suspect that the difference in power from the RFX75 had more to do with variations in the type of radio it was used on. The RFX75 has a ERF2030 (disguised IRF520) inside, driving the ERF7530. Not sure just what power the 2030 pumped into the 7530, but I'll guess it was around one-fourth the module's peak output power. Probably ought to take a derelict RFX75 and configure it to test possible substitute parts. TIme to order some IRFP240 and 250 parts to try that way. Comparing the specs of the two is a bit confusing. Gotta learn how to apply "gate charge" and "rise time" to RF-power gain. 73 [/QUOTE]

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