You can now help support WorldwideDX when you shop on Amazon at no additional cost to you! Simply follow this Shop on Amazon link first and a portion of any purchase is sent to WorldwideDX to help with site costs.
The Feb 2025 Radioddity Giveaway Results are In! Click Here to see who won!

Reply to thread

Message

While these are made on the cheap they are not "dirty" unless you overdrive them. This is a quote from K6AER, a HAM op:"There is a constant current regulator made from TR4 and TR5 which supplies current to a forward biased diode D11. This holds the bias at about the same junction threshold of the pair of SD1446 transistors which are configured in a push/pull configuration. This should be a fairly clean amplifier if it is not overdriven. Amplifiers produce two types of interference. The first type which most hams understand is harmonics which will increase if overdriven but the harmonic content (out of band signals as a product of harmonic relationships of the driven signal) which can be reduced with low pass filtering."
I use a KL300P that I drive @ 130 watts on SSB with good reports. Are there better? Yes there are but,these work well too if you dont push them.

<blockquote data-quote="223texas" data-source="post: 342078" data-attributes="member: 22584">While these are made on the cheap they are not &quot;dirty&quot; unless you overdrive them. This is a quote from K6AER, a HAM op:&quot;There is a constant current regulator made from TR4 and TR5 which supplies current to a forward biased diode D11. This holds the bias at about the same junction threshold of the pair of SD1446 transistors which are configured in a push/pull configuration. This should be a fairly clean amplifier if it is not overdriven. Amplifiers produce two types of interference. The first type which most hams understand is harmonics which will increase if overdriven but the harmonic content (out of band signals as a product of harmonic relationships of the driven signal) which can be reduced with low pass filtering.&quot;I use a KL300P that I drive @ 130 watts on SSB with good reports. Are there better? Yes there are but,these work well too if you dont push them.</blockquote>

[QUOTE="223texas, post: 342078, member: 22584"] While these are made on the cheap they are not "dirty" unless you overdrive them. This is a quote from K6AER, a HAM op:"There is a constant current regulator made from TR4 and TR5 which supplies current to a forward biased diode D11. This holds the bias at about the same junction threshold of the pair of SD1446 transistors which are configured in a push/pull configuration. This should be a fairly clean amplifier if it is not overdriven. Amplifiers produce two types of interference. The first type which most hams understand is harmonics which will increase if overdriven but the harmonic content (out of band signals as a product of harmonic relationships of the driven signal) which can be reduced with low pass filtering." I use a KL300P that I drive @ 130 watts on SSB with good reports. Are there better? Yes there are but,these work well too if you dont push them. [/QUOTE]

Top Bottom