[HBR] Slide Rule dials

[john]

I think they "seriesed" the jackson drive on the HW101 I built.... but thats
been about 27 yrs ago! Made for a very smooth unit, with a better feel I
think, than the SB series rigs...

Sounds like it should work FB Kees...
John



At 04:03 PM 3/19/02 -0600, you wrote:
>Found out that Heathkit SB series equipment (tube type) has 3/4" 
>solderable pulleys on the preselector shaft. These Heathkit units 
>are quite common, many are parts only units, and Marty has 
>agreed to send me some.  The reduction of a Jackson Bros vernier 
>is actually 6.4:1 (3.2 turns stop-to-stop) so if you mount stacked 
>drives to the tuning capacitor to reduce binding and for mechanical 
>rigidity, solder the pulley on the second drive's shaft, you have a 
>7.5" dial cord travel with 20.5 dial turns stop-to-stop. The is very 
>good ham band only tuning (for 500Khz per segments). The 898
>Eddystone has a 110:1 tuning rate, or 55 turns stop-to-stop which
>is actually too slow for hamband tuning but great for shortwave 
>tuning (several Mhz per segnment) ...my opinion, your's may vary.
>
>Works for me, should for OK on a HBR-16 or HBR-12 size unit.
>
>I'm going to try it on an HBR-12. 
>
>Does anyone have any of the JW Miller 1709 or 1710 IF cans. I have
>several of the ARC/5 85Khz IFs but they will be too large.
>
>73s  Kees K5BCQ
>
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