40 meter band conversion to Cobra 148F CB Radio
My 40 meter band conversion to a cobra 148f demonstrating the radio receiving and low power transmit on 7 mhz.
Flex 5000 Filters
This is a demonstration of the FLex 5000 filters. I am on 40M with the pre-amp on. I am using a crystal controlled signal generator which has the best spectral purity, but its best output is S9. I tried an Elecraft transmitter which could generate a higher signal strength but had far worse spectral purity so I opted for this. The band width starts at 400hz on CW dropping to 13hz. I re-tune the radio so at each succeeding decrease in band width I am back at S9 and drop the bandwidth. I think this is a better demonstration than constantly retuning since the equations that determine the filters are all the same equations as opposed to discrete crystal filters, so the characteristic of each filter is the same, only the bandwidth is different. MDS with the pre-amp active on 40M is on the order of -150dBm. As you can see the performance of the filters is phenomenal and with NO ringing. You can also hear how quiet the receiver is in this demonstration. I will do a video on the AGC at some point to show why this is such a quiet receiver. The lack of fatigue when listening to this radio is the best of any radio I have ever owned Because of the AGC and the quietness you can really spend hours and hours listening with virtually no fatigue. Hope you enjoyed this one as I think its one of the best aspects of the radio
40 meter QSO from Ham Radio in the Park
Recorded 4/24/2010 at Ham Radio in the Park - Ham Association of Mesquite's monthly get together. http://groups.yahoo.com/group/mesquiteham/ This is a conversation between Andy WY5V and Dick K5RJS, 100 watts, 7.195.00 mhz on a Kenwood TS-570. The antenna is a 40m delta loop about 18 feet off the ground with three sets of fiberglass poles. The contact distance was about 80 miles.