Fw: Re: [HBR] Looking for some ideas on a slide rune dial....

Thu, 14 Mar 2002 22:16:18 -0600

The Eddystone 598 is a nice 180 degree arc dial, I have one on a 
HBR-11. It's much smaller than the National ACN/ICN dials and 
about the same size as a National SCN. Best part; it has a smooth, 
10:1 tuning rate, Jackson Bros ball vernier drive. This has a "better" 
feel than the "standard", 6.5:1 tuning rate, Jackson Bros ball vernier 
drive. The size of the dial is compatible with the HBR-11/12 size 
receivers where the Eddystone 898 or the ACN/ICN dials would be 
too large. 

As an aside....I wouldn't be surprised if the 598 dials are actually 
more difficult to locate than the 898 Eddystones because the 898
was THE dial if you could afford it. National dials were OK-good,
inexpensive, and readily available. 

A slower tuning ratio is desirable when using the "standard" 
Jackson Bros drives and that's why two stacked ball verniers 
with, a 42:1 tuning rate (21 turns stop to stop), are better yet, 
but they must be mounted solidly.

The drawback of all 180 degree arc dials (in my opinion) is that
there is limited space to indicate frequencies on the inner arcs.
A "sliderule" dial circumvents this problem. 

"Human factors" and "ease of use" are very important in receivers ....
....that's what you are looking at and tuning for hours on end. Digital
dials are really easy to use but "don't look right" on tube type 
receivers (my opinion).     

Got off on a tangent ...what was your question ? 

73s  Kees K5BCQ  

--------- Forwarded message ----------
From: "Byron Tatum" <[email protected]>
To: <[email protected]>
Date: Thu, 14 Mar 2002 21:04:20 -0600
Subject: Re: [HBR] Looking for some ideas on a slide rune dial....
Message-ID: <001301c1cbce$1b2b2b40$28dedacf@tatum001>
References: <[email protected]>

Hello Kees-
    What do you think about the Eddystone 598? I have never used one
before.
----- Original Message -----
From: "Sandy and Kees Talen" <[email protected]>
To: <[email protected]>
Sent: Thursday, March 14, 2002 7:38 PM
Subject: [HBR] Looking for some ideas on a slide rune dial....

> Open to ideas and suggestions.......
>
> Since the Eddystone 898 dials are expensive, difficult to locate,
> and too large for the smaller HBR-11, it would be nice to come
> up with an inexpensive, useable, and easy to build slide rule dial
> adaptable to both an existing HBR-16 or HBR-11.
>
> The dual Jackson Bros verniers are excellent, so the knob to tuning
> capacitor drive is solutioned at 36:1. The only hangup is capacitor
> shaft to a slide rule indicator. Maybe using a dial cord driven off a
> pulley on the capacitor shaft. I want something which can be
> retrofitted onto the older HBRs without having to resort to the
> elevated subchassis used for the 898 dial.  Also something which
> could be scaled down to "look right" on a smaller HBR-11/12.
>
> 73s  Kees K5BCQ
>
>
>
> ************************************
> Visit the HBR Receiver Web Site with over 100 pictures of receivers and
> construction notes...... via http://www.qsl.net/k5bcq/
>
> HBR mailing list
> [email protected]
> http://mailman.qth.net/mailman/listinfo/hbr
>

************************************
Visit the HBR Receiver Web Site with over 100 pictures of receivers and 
construction notes...... via http://www.qsl.net/k5bcq/ 

HBR mailing list
[email protected]
http://mailman.qth.net/mailman/listinfo/hbr