Folks, IM(not so)HO, Rework eliminators are fine for those options that you DO NOT intend to install initially (except for the K60XV). For those options that you order with your K2, the parts to install these options are included with the option kits and the K2 manual tells you when to install the 'hooks' for these options. Your ability to test the K2 according to the manual instructions is compromised with the Rework Eliminators because you must coordinate two sets of instructions to get the task accomplished. The easy and safe path is to simply follow the K2 manual instructions without installing the Rework Eliminators.
The K60XV option is a bit on the 'strange side'. If you install the parts for the K60XV option according to the Rework Eliminator instructions (especially the change on C71 and the addition of D19 and D20), the entire character of the K2 VFO circuit changes. The VFO voltages measured at R30 will change, and since the K2 cannot be tuned to 5300 kHz from the 60 meter band until the K60XV is actually installed, you end up with a K2 that cannot be fully aligned in a proper manner - and you must re-visit the alignment when the K60XV is actually available (so much for the 'plug and play' ads). For problem 'chasing' on options that you have purchased with the K2, there are easy to implement jumpers that can be placed into the option headers with a couple capacitors and a few jumper wires (the Rework Eliminator boards are too large IMHO to allow complete access to all probing points in the K2). Specifically the KDSP2 can be substituted with 2 jumpers that take the place of the R18 and R19 zero ohm 'resistors'. The KSB2 requires 2 wire jumpers in place of W2 and W3 and one .001 uF capacitor in place of C167 stuck into the KSB2 headers. The KNB2 is the one exception, because a proper termination requires a 6 dB pad to be installed at the header. Yes, a simple wire jumper in place of W5 will substitute for the 6 dB pad in most cases, but the termination for the Post-Mixer Amplifier will not be quite correct and the receiver IMD will suffer a bit, but for most testing purposes, a straight jumper will do the job fine - just do not attempt IMD measurements without the proper 6 dB pad. All in all, I regard the Rework Eliminators as a waste of money and an inconvenience for most builders. As I said, the K60XV rework eliminator inclusion can lead to a number of problems and I trust that those problems with the K60XV are now identified in the documentation with the Rework Eliminator instructions - I have had correspondence with the Rework Eliminator folks on this subject, and they did say they would address the situation, but I have no information on the outcome of those discussions. 73, Don W3FPR > -----Original Message----- > > Also, if I bought the DSP filter and intend to install it, is the rework > elimnator still useful for using the rig without the DSP, or if I want to > install my own filter in place of the DSP filter? > > _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
