HB9DRV, is that not Simon's call from Ham Radio Deluxe?
ADT200A has been extensively debated in here and in other forums. The excellent transmitter and PC driven bandscope are both excellent. The onscreen dynamic range and speed cannot be matched
by any other bandscope/SDR solution. You can clearly see that this radio was designed by someone who knows how a spectrum analyzer should work, and by someone who has used a quality spectrum analyzer.
The rubbish software that comes with most SDR radios are just token gestures whose potential accuracy is squandered by poorly thought out bandscope software that is useful for little else.
Its a real shame that the ADAT transceiver is not marketed more aggressively. In my book the ADAT will always be the better radios because so much attention was payed to the spectral purity of the transmitter.
All the other SDR solutions and projects like the Hermes have transmitters not much better than CB grade power amplifiers with poor inherent IMD. What good is it having such fine receivers and yet the very transmitter will never allow
most other hams on the air from realizing their full dynamic range potential because of bad TX IMD. When viewed from this perspective you might as well stick with a IC706 despite all the hype. Hams and the way they apply technology
to their hobby should do so within the parameters of the laws of physics. Dirty transmitters when combined with state of the art SDR receiver cant bend the laws of physics, we still dont get it when it comes to the subject of transmitter
design... A splatter blanker would be more useful than a new SDR technology transceiver! Heck even my KWM2a puts out a cleaner signal than 99% of transceivers of today.
The reality of SDR transceivers is making the ham band even worst when we combine sub-standard transmitter with wideband ESSB audio. The snap, crackles, pops, ALC buckshotting and general crud from station using wide bandwidth audio is really unacceptable abuse of valuable resource. Its really unforgivable that hams have to put up with this deliberate interference equipment that meets no standards and just causes QRM. It seems that most of the adopters of SDR radios adopt them for this very reason, SDR radios can transmit wideband ESSB. Its unfortunate that this technology cant improve ineligibility and all that they are good at is causing a lot of misery on the ham bands.
Its ludicrous that this technology can be used without limits regardless of the harm that they cause. All I know as we get supposedly better SDR transmitter technology the average TX audio quality and ineligibility is getting worst and likewise the splatter. The trend in military HF radios is the opposite, cleaner transmitters and quality TX audio that gets the message through. Hams have truly gone off on tangent that is nothing more than turning the ham radio hobby into a glorified version of CB amplified microphone practice.
Did anyone mention that for 4 years there has been a Ham band
DDC/DUC Transceiver called the ADT-200A available from Switzerlandhttp://www.adat.ch/index_e.htmlhttp://www.eham.net/reviews/detail/7037
as a feature in it's digital design by
Hans HB9CBU and his EE daughter Doris HB9DRV :-)
We are just at the entry door to exploring DDC/DUC Transceivers.
TAPR has announced open ordering for their affordable "Hermes" and
Apache Labs has announced a full 10-15W kit with full
warranty/service/support/ in the U.S. and factory repair.
Hang in there, there are many amazing dimensions of DDC/DUC to
explore with FLEX, TAPR, Apache, SunSDR2, ZS1SDR, HiQSDR, and many others :-)
73 de Ken N9VV