[Heath] Heath Digest, Vol 87, Issue 5

Sun Mar 11 15:54:41 EDT 2018

As to the bare wire covered with sleeve, one should remember the cost advantage at the time the kit was built.  In quantity, delivering bare wire for a kit served a variety of uses in the kit. these included ground jumpers on tube sockets, shorting adjacent terminals on switches and making jumpers on the single sided circuit boards of the day.  I use bare wire covered with teflon tubing these days.AlWB9UVJ

    On Wednesday, March 7, 2018 7:17 PM, "heath-request at puck.nether.net" <heath-request at puck.nether.net> wrote:

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Today's Topics:

  1. Re: Bare vs Insulated (Mike Bryce)
  2. Inductor Values (Doug & Kathy Davies)
  3. Re: HW-101 VFO - more (Kenneth G. Gordon)
  4. Re: Inductor Values (Doug & Kathy Davies)
  5. Re: Inductor Values (ChrisIwata)

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Message: 1
Date: Wed, 7 Mar 2018 12:38:32 -0500
From: Mike Bryce <prosolar at sssnet.com>
To: Larry Sheldon <larrysheldon at cox.net>
Cc: heath at puck.nether.net
Subject: Re: [Heath] Bare vs Insulated
Message-ID: <4A49BC5E-9C59-42C6-8D30-4C4E4D9EA4EB at sssnet.com>
Content-Type: text/plain; charset=utf-8

It?s easier to do especially when the distance between the two points are short.

stripping the ends off both ends of a 1-2? wire is a bear.

but!

solder one end, slip on the tubing and solder other end.

simple!

Mike, WB8VGE
www.theheathkitshop.com

> On Mar 7, 2018, at 12:07 AM, Larry Sheldon <larrysheldon at cox.net> wrote:
> 
> 
> 
> On 3/6/2018 10:53, Doug & Kathy Davies wrote:
>> I notice in many of the Heathkit manuals they say to use bare wire with sleeving added.  Why not just use insulated wire, either solid or stranded?  Is there a 'scientific' reason for this?  Just curious.
> 
> I do not actually "know" anything, but I suspect a couple of things centered on the expense failure rates of nicked covered wire.
> 
> 
> -- 
> "Eppur si muove"
> From Larry's Cox account.
> _______________________________________________
> Heath mailing list
> Heath at puck.nether.net
> https://puck.nether.net/mailman/listinfo/heath

------------------------------

Message: 2
Date: Wed, 7 Mar 2018 09:38:51 -0800
From: "Doug & Kathy Davies" <dkdavies3 at gmail.com>
To: Heath at puck.nether.net
Subject: [Heath] Inductor Values
Message-ID:
    <CADrcw9nXoWxnsFj5BcXgHZMXeESxgKT2kvi5c+ErxuJ2Yfye3g at mail.gmail.com>
Content-Type: text/plain; charset="utf-8"

I'm in the process of completing a previously partially built Heathkit
DX-60B transmitter.  Yesterday, I was assembling the low-pass filter and
found that two of the coil were missing.  Figuring I could wind my own, I
got some enameled wire and wound a bunch on a form that looked to be close
to the right diameter.  I measured the value with my AADE L/C meter and
finding that it was too high, started to remove turns until I got to the
correct value which was 0.32 uh in this case.  Just for grins, I put the
meter on one of the kit-supplied "green marked" coils that was, according
to the manual, supposed to be 0.44uh.  It measured 0.098uh. Since there are
two of these, I measured the other one and it' value was 0.094uh.  I also
measured the other coils and they too were not even close to the manual
values.  Now this has me puzzled.  Why would Heath put coils in the kit
that are way out of spec. or, does it really matter for this application?

Doug
VE7DRF
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Message: 3
Date: Wed, 07 Mar 2018 08:27:25 -0800
From: "Kenneth G. Gordon" <kgordon2006 at frontier.com>
To: john <johnmb at nc.rr.com>
Cc: Heath at puck.nether.net
Subject: Re: [Heath] HW-101 VFO - more
Message-ID: <5AA012ED.20270.A457C50 at kgordon2006.frontier.com>
Content-Type: text/plain; charset=US-ASCII

On 7 Mar 2018 at 6:35, john wrote:

> 
> I built an HW101 back in...hmmm 77 or 76 maybe? I do recall the VFO as 
> being one of the most challenging areas. By the end of the assembly it 
> was kind of a web of flying leads inside the aluminum box.

Oh, yes. It looks very messy...

> Neat rig though!
> 
> John K5MO

Yes.

I have always considered that VFO to be an unusually good one. The tuning capacitor is 
actually a temperature-compensating type. The next time you look at it, notice the different 
colored plates.

The drift in the entire system is good enough for modern use after a good warm up.

It is no wonder the HW-101 was one of the most popular kits Heathkit ever produced.

Ken W7EKB

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Message: 4
Date: Wed, 7 Mar 2018 14:51:04 -0800
From: "Doug & Kathy Davies" <dkdavies3 at gmail.com>
To: Heath at puck.nether.net
Subject: Re: [Heath] Inductor Values
Message-ID:
    <CADrcw9mQfYNAcdVzNDuOqYxZVO8GREoM=pv3O1dMgBq1P7rRng at mail.gmail.com>
Content-Type: text/plain; charset="utf-8"

I ran the numbers through an on-line inductance calculator using the stock
Heathkit coils.  They all came out exactly what the manual values said they
should be.  I then wound a few turns of enameled wire on the form I have
and, after playing with the turns, I achieved a value of 0.318 uH.  The
manual value is 0.320 uH so I think I'm good to go with those I wound.
Looks like I won't be relying on the AADE L/C meter.

The coils are for the low pass filter in a Heathkit DX-60B transmitter.
The schematic can be viewed here: https://www.vintage-radio.info/heathkit/

Doug
VE7DRF

On Wed, Mar 7, 2018 at 9:38 AM, Doug & Kathy Davies <dkdavies3 at gmail.com>
wrote:

> I'm in the process of completing a previously partially built Heathkit
> DX-60B transmitter.  Yesterday, I was assembling the low-pass filter and
> found that two of the coil were missing.  Figuring I could wind my own, I
> got some enameled wire and wound a bunch on a form that looked to be close
> to the right diameter.  I measured the value with my AADE L/C meter and
> finding that it was too high, started to remove turns until I got to the
> correct value which was 0.32 uh in this case.  Just for grins, I put the
> meter on one of the kit-supplied "green marked" coils that was, according
> to the manual, supposed to be 0.44uh.  It measured 0.098uh. Since there are
> two of these, I measured the other one and it' value was 0.094uh.  I
> also measured the other coils and they too were not even close to the
> manual values.  Now this has me puzzled.  Why would Heath put coils in
> the kit that are way out of spec. or, does it really matter for this
> application?
>
> Doug
> VE7DRF
>
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Message: 5
Date: Wed, 7 Mar 2018 17:16:18 -0800
From: ChrisIwata <chrisiwata at aol.com>
To: heath at puck.nether.net
Subject: Re: [Heath] Inductor Values
Message-ID: <5AA08EE2.8030907 at aol.com>
Content-Type: text/plain; charset="windows-1252"; Format="flowed"

I also have an AADE L/C meter.  Mostly it works fine, but some caveats:

(1) Always run with a fresh 9V battery.  When the battery is low, the 
readings get screwy.
(2) Short leads are a must.  Lay the component on the bottom side of the 
case if you must:  For whatever reason if you  place the component over 
the LCD part of the meter, the reading is changed. Bear in mind that the 
leads become part of the component measurement.
(3) Always zero the meter before making measurements.  For an inductor, 
a short piece of bare wire directly between the binding posts is the 
right method

I've found this meter to be the most accurate when measuring small 
values of L and C, bang-for-the buck wise.

Chris, KL7DM

On 3/7/2018 2:51 PM, Doug & Kathy Davies wrote:
> I ran the numbers through an on-line inductance calculator using the 
> stock Heathkit coils.  They all came out exactly what the manual 
> values said they should be.  I then wound a few turns of enameled wire 
> on the form I have and, after playing with the turns, I achieved a 
> value of 0.318 uH.  The manual value is 0.320 uH so I think I'm good 
> to go with those I wound.  Looks like I won't be relying on the AADE 
> L/C meter.
>
> The coils are for the low pass filter in a Heathkit DX-60B 
> transmitter.  The schematic can be viewed here: 
> https://www.vintage-radio.info/heathkit/
>
> Doug
> VE7DRF
>
> On Wed, Mar 7, 2018 at 9:38 AM, Doug & Kathy Davies 
> <dkdavies3 at gmail.com <mailto:dkdavies3 at gmail.com>> wrote:
>
>    I'm in the process of completing a previously partially built
>    Heathkit DX-60B transmitter.  Yesterday, I was assembling the
>    low-pass filter and found that two of the coil were missing. 
>    Figuring I could wind my own, I got some enameled wire and wound a
>    bunch on a form that looked to be close to the right diameter.  I
>    measured the value with my AADE L/C meter and finding that it was
>    too high, started to remove turns until I got to the correct value
>    which was 0.32 uh in this case.  Just for grins, I put the meter
>    on one of the kit-supplied "green marked" coils that was,
>    according to the manual, supposed to be 0.44uh.  It measured
>    0.098uh. Since there are two of these, I measured the other one
>    and it' value was 0.094uh. I also measured the other coils and
>    they too were not even close to the manual values.Now this has me
>    puzzled.  Why would Heath put coils in the kit that are way out of
>    spec. or, does it really matter for this application?
>
>    Doug
>    VE7DRF
>
>
>
>
> _______________________________________________
> Heath mailing list
> Heath at puck.nether.net
> https://puck.nether.net/mailman/listinfo/heath

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End of Heath Digest, Vol 87, Issue 5
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