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All the rigs I looked at are somewhere on the excellent side of Rob Sherwood's list, some with better numbers in some category or another than others, but nothing that a casual operator would notice. For me, it won, hands down, and I have not regretted the purchase for a moment. Then I went to my buddy Dave's house and messed around with his Flex 6400 and Maestro. I spent a lot of time at the local ham store playing with the various ICOM and Kenwood rigs (they were out of demo Yaesu rigs). My recent choice of the Flex 6400 was driven partially by good RX performance, but mainly features and function (particularly a really great panadapter). Reasonable performance, easy to use, well laid out controls and a vast range - 160M thru 70cm (excluding 222MHz xmit.). For my generic ham use, it was a great choice. It (even then) did not have the best numbers, and would not be a good choice for a serious contester. That is not terribly suitable for amateur use, but that is the solution to all this RMDR 'stuff'. BTW - if you want the best receiver performance, you do what the military and commercial (marine, avionics, etc) radio equipment manufacturers have done which is to go complete CHANNELIZED (no VFO). He'll likely tell you exactly what I just layed out. So if you don't accept my comment, drop Rob a line and ask him yourself. Likewise, my K3S is always in the top 5, but frankly given the small front panel layout with 'multiknob' design, having to constantly push and double push knobs in, make it less user friendly to me, although it has a superb receiver. AS far as the new FT-101D, while I have heard its DNR capability is excellent the ergonomics and lack of certain features (no Tx Tune feature, No Averaging for the bandscope) is a deal breaker for me - I would never own one and much prefer the Flex line or TS-890, hands down. For most amateur communications, you won't notice any difference in receiver performance between #1 and #10 (maybe even lower). The RMDR ratings would only apply for conditions of very close-in QRM, like for contesting, etc. He will tell you, and has gone on record, as saying that there likely is going to be very little difference in performance in the top 10 radios in his Sherwood Rcvr List.
#K4 RECEIVER RADIO CODE#
Source code and hex file for this project not available due to licencing.I also know Rob and have communicated with him personally. K6 = 2-pin header connect to K5 on receiver board via coax cable K4,K5 = 5-pin header interconnect via flatcable (e.g., Conrad Electronics # 741230)
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K3 = 7-pin header connect to K3 and K4 on receiver board K1,K2 = 8-pin header interconnect using flatcable (e.g. S1 = rotary encoder 24-30 pulses per revolution LD1-LD6 = 7-segment LED display, common cathode, height= 13mm (e.g.
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Microcontroller and display board (030417-2) PCB, order code 030417-1 from The PCBShop X1 = 44.545MHz quartz crystal, parallel resonance, CL = 32pFįL4 = SFR455E 100♚ or 150♚ moving-coil meter, (S-meter), connect to M1Įnclosure, Bopla Lab, dim, 223 x 199 x 56 mm (Conrad Electronics # 523348)
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JP1 = 3-pin header with jumper, or changeover switch K6,K7,M1,LS1 = 2-pin header or 2 solder pins K5 = 2-pin header with lenght of thin 50? coax cable Suggested methods of obtaining sufficient pull from nondescript CSB455 devices may be found on our Forum. The CSB455 supplied by Barend Hendriksen and used in our prototype gave good results. Updated Gerber files were sent to ThePCBShop on 2 March 2007 The corrected parts list and PCB artwork (pdf file) may be downloaded from our website.ĭepending on the response of the readout to fast turning of the rotary encoder, and the encoder used, the value of capacitor C40 may be changed a little.Īlthough on MIX1 the marking is with pin 6 instead of pin 1, the device can be mounted as shown because of its internal symmetry.įor SSB reception, the amount of frequency pull that can be obtained from the CSB455 device (X3) will depend on the exact type and brand. The connection should be made with a piece of wire. The PCB design has a length of copper track missing at pin 19 of the MAX7219. In the components list, L11 should be marked as 1μH2. This may be corrected by transposing the component references in circuit diagram Figure 2. Inductors L11 and L14 have been transposed on the component overlay. A suggested replacement is the ATmega8515, which offers AT90S8515 compatibility thanks to its SC8515 compatibility mode fuse. Although the AT90S8515 used in the project is no longer recommended for new designs, it is still generally available (December 2006).