[Milsurplus] ARC-5 Tuning Knob Needed

[B. Smith]

    A toothpaste cap works great.
k4che

On 12/5/2017 6:01 PM, Kenneth G. Gordon wrote:
> On 4 Dec 2017 at 21:42, Richard Solomon wrote:
>
>> I picked up a BC-453 to use on 472 KHz. I need a splined knob to tune
>> it.
>>
>> There are a number of plastic splined knobs on e-Pay, but not sure what
>> fits.
>>
>> Anyone got a knob they will part with ?
>>
>> Tnx es HH, Dick, W1KSZ
> Hello, Dick. There are at least three versions of a knob the military used with these
> receivers. One, which we call "the wee knob", originally was included fastened under the lid
> of some of the later model AN/ARC-5 receivers. I have not seen any of those show up on
> eBay, but I'll bet they have. The second model, with a small crank on it, was used in the
> repair shops. Those normally sell on eBay for around $30 each. A third, much more rare
> knob was similar to the type 2 above, but had a scale on it. Those I have seen on eBay sold
> for $50 and more.
>
> Personally, I have never liked any of those OEM knobs as they exhibit a terrible amount of
> back-lash, whereas the tuning mechanism in the receiver itself is completely back-lash free.
> They fit very sloppily on the spline and make zero-beating very difficult.
>
> So, I make my own by cutting off a short section of 1/4" diameter hard-brass tubing about 1"
> long or so, cut two slots about 3/8" long parallel to the long axis of the tubing on one end,
> then I drive that "split" end over the splined shaft, install a good knob on the other end (the
> larger the knob the better), center it up, and, bang!, instant back-lash-free tuning knob.
>
> If you really want to, you can use a bunch of super-glue to make it so it never comes off, but
> I have never needed to do that.
>
> Ken W7EKB
>
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