"It has been reported that the Kuhne up converter has a major design flaw related to frequency stability. This is so major that the voice is almost not intelligble on SSB from some stations using this Kuhne product. I have attached a recording documenting this issue (stations significantly worse than this has been heard as well). The station on the recording is using the Kuhne up converter.
Customers have also reported several soldered straps on the product so it appears thst an unfinished prototype has been released (!) Finally the product is not equipped with an input for external reference. This is very supprising since this is an S band transmitter. It should be clear to any seasoned and experienced RF engineer that frequency stability must be very critical on an S band transmitter for narrowband operation released into the market.
It is very surprising that Kuhne releases what in my opinion appears as a unfinished prototype with stability issues and straps into the market. Especially when we compare the price to other offerings in the market.
**Buyers be aware!**"
