In an earlier thread about the various switching power supplies available on Amazon, there were questions posted about the difference between the authentic American made MegaWatt 30 amp supply and the cheaper Chinese imitation supply. I've purchased both supplies and used them extensively with my Elecraft K3 and can now report on the major difference.
First, here are links to the two supplies in question:
MegaWatt 30 amp switching power supply:
Amazon product ASIN B00JZBE97U
Chinese 30 amp switching power supply:
Amazon product ASIN B00D7CWSCG
The two supplies look identical, although the Chinese supply does not include an AC power cord. However, the performance difference is significant: The MegaWatt has no "hash", while the Chinese unit has terrible "hash". I took pictures of the interference on the Panadapter that shows the difference visually.
First, here's the Chinese supply:
The slanted lines in the pic are heard in the receiver has a high pitched whine that slowly lowers in pitch and interferes dramatically with your RX signal. It can get so bad that it can wipe out the intended signal.
Here's the same frequency only moments later on the Megawatt Supply:
Notice that there is no slanted lines; only clean signals of the transmitting stations. That's because there is no hash. They say a picture is worth a thousand words, but in this case a video demonstrating the difference between the two supplies tells the whole story:
First, here are links to the two supplies in question:
MegaWatt 30 amp switching power supply:
Amazon product ASIN B00JZBE97U
Chinese 30 amp switching power supply:
Amazon product ASIN B00D7CWSCG
The two supplies look identical, although the Chinese supply does not include an AC power cord. However, the performance difference is significant: The MegaWatt has no "hash", while the Chinese unit has terrible "hash". I took pictures of the interference on the Panadapter that shows the difference visually.
First, here's the Chinese supply:
The slanted lines in the pic are heard in the receiver has a high pitched whine that slowly lowers in pitch and interferes dramatically with your RX signal. It can get so bad that it can wipe out the intended signal.
Here's the same frequency only moments later on the Megawatt Supply:
Notice that there is no slanted lines; only clean signals of the transmitting stations. That's because there is no hash. They say a picture is worth a thousand words, but in this case a video demonstrating the difference between the two supplies tells the whole story:
