Mike, Thank you very much for taking the time to give these details. This is extremely helpful.
Bill KB1DX On Mon, Jun 17, 2013 at 10:10 PM, Mike Morrow <[email protected]> wrote: > Bill wrote: > > > ...What I observed is when the Band switch is used > > to cycle through the bands 30 meters does not show up in the display, but > > 20 meters appears to show up twice. > > The K1 does *not* know automatically which bands are available on any > filter board that is plugged in. That is why the procedure at the bottom > of page 16 of the KFL1-4 manual (rev. A) must be used to manually tell > the K1 MPU what bands the plugged-in filter board possesses. > > Completing that assignment process causes the K1 to format the frequency > display (LCD) as appropriate for the assigned bands. In addition, each > amateur band 160m, 80m, 40m, 30m, 20m, 17m, 15m, 12m, and 10m has a > band-specific display frequency calibration constant stored in the > K1 MPU. This constant is set automatically when you perform the OPF > (operating frequency) calibration for that band (page 18 of the KFL1-4 > manual). So...the other thing that happens (in addition to LCD formatting) > when you assign a specific HF ham band to band b1 (b2, b3, b4) is that > the previously-stored OPF calibration constant for that ham band is > automatically assigned to band b1 (b2, b3, b4). > > Aside from that, a band assignment does **not** actually affect the > operation of the rest of the K1. You could manually assign *all* bands > as 20 meters, yet when you cycle through band b1 (b2, b3, b4), the K1 > will still actually still function on 40m (30m, 20m, 15m), even though > the displayed frequency *appears* to be 20m for each band. > > > One of the appearances of 20 meters functions, but the other does not, > > That seems to describe your seeing 7.xxx, 14.xxx, 14.xxx, 21.xxx in the > LCD as you cycle through the bands. (Normally you should see the > repetitive > display of 7.xxx, 10.xxx, 14.xxx, 21.xxx as you cycle through.) If that > is correct, then which of the two 14.xxx bands does not function? If the > one that doesn't work is the first 14.xxx after 7.xxx, then apparently > you have a problem with band b2 on you KFL1-4...the band position that > should be 30m. Just re-assigning b2 to 30m (either 10.000 for an 18.000 > MHz filter board crystal or 10.100 for an 18.100 MHz filter board crystal) > will *not* fix the non-functioning band. You should go ahead and assign > b2 properly, but then your real troubleshooting begins. > > OTOH, if the band with the *second* "14.xxx" display is the one that is not > working, you have troubleshooting to do on your 20m filter circuitry. The > 30m circuitry is likely OK, although K1 b2 needs to be re-assigned to 30m. > > As far as troubleshooting a bad 30m band, you could attempt to re-align the > 30m (b2) capacitors on the KFL1-4 per its manual. However, that will also > then require re-aligning the 40m band as well. (Part of the 40m resonant > circuits make use of the tuning circuits of 30m.) > > If you are not successful in returning the 30m band to operation by > re-alignment, then you'll need to look for another failure. The most > common > reason for a K1 band to be totally dead is a bad heterodyne crystal on the > filter board. Do you have a receiver that could be used to hear the 30m > crystal near 18.000 or 18.100 MHz (+/- about 10 kHz), when b2 is selected? > > > ...which is likely 30 meters not being recognized and showing up as 20 > > meters. > > Definitely not. The only way your K1 knows what ham band is assigned to b2 > is from the band assignment that must be performed manually. The K1 does > not sense or otherwise know if any or all bands on a filter board are > working > or dead. The only information that the filter board gives to the front > panel > MPU (the central 'brain' of the K1) is whether it is a two-band or > four-band > filter board. That way the K1 knows whether to let you assign a specific > ham > band to just b1/b2, or to b1/b2/b3/b4. > > That part is definitely working. > > Mike / KK5F > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
