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On Feb 9, 11:06 am, "COLIN LAMB" wrote:
Hallicrafters had some very competent engineers, and they solved the mechanical problem of the SX-100. Their solution was the SX-101. It is clear that they needed to add both depth and weight to solve the problem. Consider the SX-100 as the Narrows Bridge (Galloping Gertie). The SX-101 was the replacement. 73, Colin K7FM I have considered replacing the steel cables with regular dial cord. I have not got around to it yet but I think the idea has merit. One can only describe the mechanical instability/microphonics as "Guitar String" like. Otherwise the tuning capacitor layout is similar to other receivers of the era. Tony |
#2
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On Mar 14, 1:25*pm, WA6LZH wrote:
On Feb 9, 11:06 am, "COLIN LAMB" wrote: Hallicrafters had some very competent engineers, and they solved the mechanical problem of the SX-100. *Their solution was the SX-101. *It is clear that they needed to add both depth and weight to solve the problem.. Consider the SX-100 as the Narrows Bridge (Galloping Gertie). *The SX-101 was the replacement. 73, *Colin *K7FM I have considered replacing the steel cables with regular dial cord. I have not got around to it yet but I think the idea has merit. One can only describe the mechanical instability/microphonics as "Guitar String" like. Otherwise the tuning capacitor layout is similar to other receivers of the era. Tony I have my SX 100 mounted in a bookshelf and mounted a 117v muffin fan to the bottom of the shelf above blowing air across the top to keep the temp fairly stabile after warmup. It has cut down the drift. I also found that by not setting the speaker directly on top of the rcvr it cut the microphonic tendency. This also was also true of several other Halli's. These solutions worked for me and I did not have to mod the units in any way. I think I would keep the steel cables because they will last forever over dial cord unless you really trace down noise to them. 73 Mike KF6KXG |
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