<html><head></head><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue-Light, Helvetica Neue Light, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div id="yui_3_16_0_ym19_1_1461024703668_3420" dir="ltr">I was reading from farther down that page. I missed the "direct planetary drive" in the first paragraph!</div><div id="yui_3_16_0_ym19_1_1461024703668_3420" dir="ltr"><br></div><div id="yui_3_16_0_ym19_1_1461024703668_3420" dir="ltr"><br></div><div id="yui_3_16_0_ym19_1_1461024703668_3420" dir="ltr">I'll have to take my receivers out of the cabinet and take a very close look at what is actually there!</div><div id="yui_3_16_0_ym19_1_1461024703668_3420" dir="ltr"><br></div><div></div><div id="yui_3_16_0_ym19_1_1461024703668_3422"> </div><div class="signature" id="yui_3_16_0_ym19_1_1461024703668_3419">Glen, K9STH </div><div class="signature" id="yui_3_16_0_ym19_1_1461024703668_3419"><br></div><div class="signature" id="yui_3_16_0_ym19_1_1461024703668_3419">Website: http://k9sth.net</div><div class="qtdSeparateBR" id="yui_3_16_0_ym19_1_1461024703668_3418"><br><br></div><div class="yahoo_quoted" id="yui_3_16_0_ym19_1_1461024703668_3386" style="display: block;"> <div style="font-family: HelveticaNeue-Light, Helvetica Neue Light, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_ym19_1_1461024703668_3385"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_ym19_1_1461024703668_3384"> <div dir="ltr" id="yui_3_16_0_ym19_1_1461024703668_3417"> <font size="2" face="Arial" id="yui_3_16_0_ym19_1_1461024703668_3416"> <hr size="1"> <b><span style="font-weight:bold;">From:</span></b> Kenneth G. Gordon <kgordon2006@frontier.com><br> <b><span style="font-weight: bold;">To:</span></b> Glen Zook <gzook@yahoo.com>; "Heath@puck.nether.net" <Heath@puck.nether.net> <br> <b><span style="font-weight: bold;">Sent:</span></b> Tuesday, April 19, 2016 2:02 AM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [Heath] AR-3 - another question<br> </font> </div> <div class="y_msg_container" id="yui_3_16_0_ym19_1_1461024703668_3383"><br><div id="yiv6451165350"><title></title><div id="yui_3_16_0_ym19_1_1461024703668_3382">
<div align="left" id="yui_3_16_0_ym19_1_1461024703668_3415"><font face="Arial" size="2" id="yui_3_16_0_ym19_1_1461024703668_3538"><span style="font-size:10pt;" id="yui_3_16_0_ym19_1_1461024703668_3537">On 18 Apr 2016 at 23:28, Glen Zook wrote:</span></font></div>
<div align="left" id="yui_3_16_0_ym19_1_1461024703668_3499"><font face="Arial" color="#0000ff" size="2"><span style="font-size:10pt;"><br clear="none">
</span></font></div>
<div align="left" id="yui_3_16_0_ym19_1_1461024703668_3519"><font face="Arial" color="#0000ff" size="2" id="yui_3_16_0_ym19_1_1461024703668_3540"><span style="font-size:10pt;" id="yui_3_16_0_ym19_1_1461024703668_3539">> You are reading the manual incorrectly! What it means by the dual tuning</span></font></div>
<div align="left" id="yui_3_16_0_ym19_1_1461024703668_3414"><font face="Arial" color="#0000ff" size="2" id="yui_3_16_0_ym19_1_1461024703668_3413"><span style="font-size:10pt;" id="yui_3_16_0_ym19_1_1461024703668_3412">> capacitor is there are 2-sections to the capacitor and there is a separate</span></font></div>
<div align="left" id="yui_3_16_0_ym19_1_1461024703668_3411"><font face="Arial" color="#0000ff" size="2"><span style="font-size:10pt;">> bandspread capacitor. </span></font></div>
<div align="left" id="yui_3_16_0_ym19_1_1461024703668_3410"><font face="Arial" color="#0000ff" size="2"><span style="font-size:10pt;"><br clear="none">
</span></font></div>
<div align="left" id="yui_3_16_0_ym19_1_1461024703668_3409"><font face="Arial" size="2" id="yui_3_16_0_ym19_1_1461024703668_3408"><span style="font-size:10pt;" id="yui_3_16_0_ym19_1_1461024703668_3407">Glen: the manual says nothing about a dual-tuning capacitor. Here are the exact words from
page 3, 2nd paragraph, of the original Heathkit AR-3 manual:</span></font></div>
<div align="left" id="yui_3_16_0_ym19_1_1461024703668_3406"><font face="Arial" size="2"><span style="font-size:10pt;"><br clear="none">
</span></font></div>
<div align="left" id="yui_3_16_0_ym19_1_1461024703668_3405"><font face="Arial" size="2" id="yui_3_16_0_ym19_1_1461024703668_3404"><span style="font-size:10pt;" id="yui_3_16_0_ym19_1_1461024703668_3403">"Four frequency bands, IN CONJUNCTION WITH DIRECT PLANETARY DRIVE, provide
continuous tuning from 550 kc to 30 mc."</span></font></div>
<div align="left" id="yui_3_16_0_ym19_1_1461024703668_3402"><font face="Arial" size="2"><span style="font-size:10pt;"><br clear="none">
</span></font></div>
<div align="left" id="yui_3_16_0_ym19_1_1461024703668_3399"><font face="Arial" size="2" id="yui_3_16_0_ym19_1_1461024703668_3401"><span style="font-size:10pt;" id="yui_3_16_0_ym19_1_1461024703668_3400">The next sentence reads as follows: "No communications type receiver would be complete
without bandspread." Then: "The AR-3 has been equipped with electrical bandspread that
operates at optimum efficiency on all frequency ranges."</span></font></div>
<div align="left" id="yui_3_16_0_ym19_1_1461024703668_3398"><font face="Arial" size="2"><span style="font-size:10pt;"><br clear="none">
</span></font></div>
<div align="left" id="yui_3_16_0_ym19_1_1461024703668_3397"><font face="Arial" size="2" id="yui_3_16_0_ym19_1_1461024703668_3396"><span style="font-size:10pt;" id="yui_3_16_0_ym19_1_1461024703668_3395">So how do you interpret the bolded section above? In addition, why is there a 1/4" section of
the main tuning capacitor shaft to which the knob is attached, and which then fits inside the
larger section of the shaft which is then connected to dial-pulley and the rotor plates?
Lastly, I own several NOS BC band tuning capacitors which look identical to this capacitor
(except for capacitance values), and which ARE "verniers".</span></font></div>
<div align="left" id="yui_3_16_0_ym19_1_1461024703668_3541"><font face="Arial" color="#0000ff" size="2"><span style="font-size:10pt;"><br clear="none">
</span></font></div>
<div align="left" id="yui_3_16_0_ym19_1_1461024703668_3542"><font face="Arial" color="#0000ff" size="2" id="yui_3_16_0_ym19_1_1461024703668_3544"><span style="font-size:10pt;" id="yui_3_16_0_ym19_1_1461024703668_3543">> The dial pulley is attached directly to a 1/4th inch diameter shaft</span></font></div>
<div align="left" id="yui_3_16_0_ym19_1_1461024703668_3545"><font face="Arial" color="#0000ff" size="2"><span style="font-size:10pt;"><br clear="none">
</span></font></div>
<div align="left" id="yui_3_16_0_ym19_1_1461024703668_3394"><font face="Arial" size="2" id="yui_3_16_0_ym19_1_1461024703668_3393"><span style="font-size:10pt;" id="yui_3_16_0_ym19_1_1461024703668_3392">Not so: the dial pulley is connected to the larger shaft which is connected to the rotor.</span></font></div>
<div align="left" id="yui_3_16_0_ym19_1_1461024703668_3391"><font face="Arial" color="#0000ff" size="2"><span style="font-size:10pt;"><br clear="none">
</span></font></div>
<div align="left" id="yui_3_16_0_ym19_1_1461024703668_3548"><font face="Arial" color="#0000ff" size="2" id="yui_3_16_0_ym19_1_1461024703668_3547"><span style="font-size:10pt;" id="yui_3_16_0_ym19_1_1461024703668_3546">> that is directly attached to the main tuning capacitor rotor. </span></font></div>
<div align="left" id="yui_3_16_0_ym19_1_1461024703668_3390"><font face="Arial" color="#0000ff" size="2"><span style="font-size:10pt;"><br clear="none">
</span></font></div>
<div align="left" id="yui_3_16_0_ym19_1_1461024703668_3389"><font face="Arial" size="2"><span style="font-size:10pt;">Not so. Look closer. The 1/4 inch shaft fits INSIDE the larger shaft which connects to the
rotor. The 1/4 inch shaft does not connect directly to the rotor, nor to the dial-pulley. At least
this is the case in all three of the AR-3s I have here.</span></font></div>
<div align="left" id="yui_3_16_0_ym19_1_1461024703668_3388"><font face="Arial" color="#0000ff" size="2"><span style="font-size:10pt;"><br clear="none">
</span></font></div>
<div align="left" id="yui_3_16_0_ym19_1_1461024703668_3387"><font face="Arial" color="#0000ff" size="2" id="yui_3_16_0_ym19_1_1461024703668_3513"><span style="font-size:10pt;" id="yui_3_16_0_ym19_1_1461024703668_3512">> There is no reducing mechanism, of any type, in both the AR-2 and AR-3. At</span></font></div>
<div align="left" id="yui_3_16_0_ym19_1_1461024703668_3511"><font face="Arial" color="#0000ff" size="2"><span style="font-size:10pt;">> least in both of my receivers. </span></font></div>
<div align="left" id="yui_3_16_0_ym19_1_1461024703668_3381"><font face="Arial" color="#0000ff" size="2"><span style="font-size:10pt;"><br clear="none">
</span></font></div>
<div align="left" id="yui_3_16_0_ym19_1_1461024703668_3504"><font face="Arial" size="2" id="yui_3_16_0_ym19_1_1461024703668_3503"><span style="font-size:10pt;" id="yui_3_16_0_ym19_1_1461024703668_3502">Well, I don't know about the AR-2 since I don't own one, but I am almost certain that the AR-3 DOES have one, but at this late date, it is frozen solid. I am equally certain that all other
AR-3s which have original tuning caps have the simple vernier mechanism but are all frozen
solid.</span></font></div>
<div align="left" id="yui_3_16_0_ym19_1_1461024703668_3506"><font face="Arial" size="2"><span style="font-size:10pt;"><br clear="none">
</span></font></div>
<div align="left" id="yui_3_16_0_ym19_1_1461024703668_3507"><font face="Arial" size="2" id="yui_3_16_0_ym19_1_1461024703668_3509"><span style="font-size:10pt;" id="yui_3_16_0_ym19_1_1461024703668_3508">Anyway, I aim to find out.</span></font></div>
<div class="yiv6451165350yqt6775340977" id="yiv6451165350yqtfd40691"><div align="left" id="yui_3_16_0_ym19_1_1461024703668_3510"><font face="Arial" size="2"><span style="font-size:10pt;"><br clear="none">
</span></font></div>
<div align="left"><font face="Arial" size="2"><span style="font-size:10pt;">Ken W7EKB</span></font></div>
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