I am starting this new thread as it appears there is some interest in this plug-in Dynamic speech processor which is available either from Funkamateur (Box73.de) or SOTABeams (sotabeams.co.uk).
several of us have received (or bought ourselves) this add-in unit for Christmas 2019 and want to do two things - set it up correctly without bad distortion and take actions to resolve problems caused by RF Ingres. It is documented several places on the web that this unit is RFI susceptible especially when the operator is using an amplifier and hence emitting more than 5 watts. the expectation is that when working correctly, the average output level of the rig will be increased resulting in an (at least audible) increase of signal at the receiving end of 1 S-point or more.
The unit is primarily designed for use with the Yaesu FT-817 and 818 QRP transceivers but as the same microphone and connector is used on the 100 Watt FT-857 and FT-897 it can also be used with these.
In my case, I have cross-wired the supplied RJ-45 lead so that I can use the DYC-817 with my Xiegu X108G portable transceiver, and hence my level of success may not be the same as those using Yaesu rigs. The Xiegu has it’s own internal (audio only) compressor which I have turned off as at anything above 2 (in its 1-10 range) the audio is badly distorted. With the Xiegu, there is also no way to turn down the microphone gain in the rig, so I am using an amplified microphone with a level control built-into it (the output from the DYC could however overload the rig if it is not able to be set low enough).
As testing from the home shack is less than adequate as the problems of RF ingres and level of background noise only occur when out portable, it is proposed to test from a summit (or at least a portable location) so that all equipment as planned for a SOTA activation can be used “in-place”.
This conversation started in this other thread SANTA & SOTA
So far it appears the following SOTA activators/chasers have or intend to, use this unit:
Although for an earlier version of the unit - this article also mentions RF Ingres problems and suggests lining the case with metal: https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=5&ved=2ahUKEwjV2O_68eDmAhVN2aQKHfA9Az8QFjAEegQIARAC&url=http%3A%2F%2Fwww.mods-ham.darc.de%2F02_Mods%2FOther-Mods%2FDYC-817%2FDG2IAQ%20Modification%20Sheet%20DYC-817.pdf&usg=AOvVaw2svvKmgbcX2uPOdEqmVvkV
Of those listed above can any of you not make a work-day activation? If so it’ll have to be a week-end (which has the problem of contests). any suggestions for a date / time for the tests?
If we can draw any conclusions from our tests, I am happy to write them up and supply them to Box73, so that they can at least include them in their documentation, if they aren’t able to implement a change in design to address the problem(s).