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#1
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Convering HW-101 to 17 and 30 meters
Hello the Group!
I have an Heathkit HW-101 that operates well on 80/75/40/20 and is useless on 15/10 meters because of all the higher frequency junk in this area. The Area is Ann Arbor/Ypsilanti near the WAAM antenna group. I want to sacrifice the 15 meter and one of the 10 meter positions for the 30 and 17 meter bands. From what I can see on the diagrams and the crystals being used, I think all I would need are crystals in the proper cans at the frequencies 18.895 for the 30 mter range and 26.896 for the 17 meter range. I realize that just changing out the crystals may not be all that is needed, however, this is the first step. Any Heathkit resources out there? And are the crystal cans of the HC6/U variety or the HC33? Curtis Scholl |
#2
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Convering HW-101 to 17 and 30 meters
"Rocketeer" wrote in message oups.com... Hello the Group! I have an Heathkit HW-101 that operates well on 80/75/40/20 and is useless on 15/10 meters because of all the higher frequency junk in this area. The Area is Ann Arbor/Ypsilanti near the WAAM antenna group. I want to sacrifice the 15 meter and one of the 10 meter positions for the 30 and 17 meter bands. From what I can see on the diagrams and the crystals being used, I think all I would need are crystals in the proper cans at the frequencies 18.895 for the 30 mter range and 26.896 for the 17 meter range. I realize that just changing out the crystals may not be all that is needed, however, this is the first step. Any Heathkit resources out there? And are the crystal cans of the HC6/U variety or the HC33? Are you sure you wouldn't rather sell the '101 and use the money to help fund a radio with the bands already built in? The crystals are part of the necessary changes, but you'll also have coils and caps to change or modify on the switchboards, perhaps finding new taps on the output coil. Looking at the manual, it seems that some of the switches appear to be sliding shorts, so you may have to reposition the 20M band components. This will reduce whatever value it may have and when you're done, it will still be a 20 to 30-year old radio with a non-standard modification. That being said, go for it! There are various ways to get information, manuals etc. Use a search engine. Sorry, I think crystals are HC6, but can't be sure. It's always possible that a change was made after I got mine, in early '70s. HTH -NM |
#3
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Convering HW-101 to 17 and 30 meters
In article .com,
"Rocketeer" wrote: Hello the Group! I have an Heathkit HW-101 that operates well on 80/75/40/20 and is useless on 15/10 meters because of all the higher frequency junk in this area. The Area is Ann Arbor/Ypsilanti near the WAAM antenna group. I want to sacrifice the 15 meter and one of the 10 meter positions for the 30 and 17 meter bands. From what I can see on the diagrams and the crystals being used, I think all I would need are crystals in the proper cans at the frequencies 18.895 for the 30 mter range and 26.896 for the 17 meter range. I realize that just changing out the crystals may not be all that is needed, however, this is the first step. Any Heathkit resources out there? And are the crystal cans of the HC6/U variety or the HC33? Curtis- The heterodyne crystals are HC6. I have one for 40 meters in my collection, although it is probably the bad one I saved. I think it was soldered into the PCB. If so, a wire-lead version should work as well. Be aware that the heterodyne oscillator is one of the weak points of the radio. It requires a very high-Q crystal or it won't oscillate. You may be able to modify the circuit to increase feedback, and improve its performance. According to my notes, the 20 Meter and 15 Meter heterodyne coils are the same part number. I don't know whether they use the same one for both positions, or have two that are individually tuned. Considering the problems you face, it might be easier to convert 20 Meters to 30 and to convert 15 Meters to 17. Converting one of the Ten meter positions will be more of a challange. 73, Fred K4DII |
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