From w5jv at hotmail.com  Tue May  3 13:07:27 2022
From: w5jv at hotmail.com (Doug Hensley)
Date: Tue, 3 May 2022 17:07:27 +0000
Subject: [Test-Equipment] Same old dumb question my way:
Message-ID: <SA0PR19MB44092AC1508500B224780FC591C09@SA0PR19MB4409.namprd19.prod.outlook.com>

Okay, so a good resister converts electrical power into heat.  Got it.

I still am interested in learning how a partially inductive load would affect
the tuning of an RF output circuit.  For example:

I took some 250 ohm 100 W Ohmite wire wounds and configured a 50 ohm
array.  The inductance of a single Ohmite was around 12.6 H.  The array
measured 360 uH.

I loaded my little rig into it and seemed to be okay.  Resistors got mildly warm.
Switched over to my LDG Auto Ant Tuner and it matched within a second.

I then changed the load to a 100W lightbulb & repeated the same thing and
did not see any difference.

So okay, the LDG is keeping the secret of whatever difference there was to
itself.

Can anyone surmise in practical terms what I did not see?

Doug W5JV




Visit https://www.qrz.com/db/W5JV for some great vacuum tube finds.



From johnk0gcj at gmail.com  Tue May  3 13:35:57 2022
From: johnk0gcj at gmail.com (JC)
Date: Tue, 3 May 2022 12:35:57 -0500
Subject: [Test-Equipment] Same old dumb question my way:
In-Reply-To: <SA0PR19MB44092AC1508500B224780FC591C09@SA0PR19MB4409.namprd19.prod.outlook.com>
References: <SA0PR19MB44092AC1508500B224780FC591C09@SA0PR19MB4409.namprd19.prod.outlook.com>
Message-ID: <CALv4R2sPUUwRjDtYY6NKxjcw4=9kkW0tnbCt0jhGrUS7AHnjFw@mail.gmail.com>

I doubt that the wirewound resistor has an inductance of 12.6 Henrys. I
would
believe 12.6 mH.

John K0GCJ



On Tue, May 3, 2022 at 12:08 PM Doug Hensley <w5jv at hotmail.com> wrote:

> Okay, so a good resister converts electrical power into heat.  Got it.
>
> I still am interested in learning how a partially inductive load would
> affect
> the tuning of an RF output circuit.  For example:
>
> I took some 250 ohm 100 W Ohmite wire wounds and configured a 50 ohm
> array.  The inductance of a single Ohmite was around 12.6 H.  The array
> measured 360 uH.
>
> I loaded my little rig into it and seemed to be okay.  Resistors got
> mildly warm.
> Switched over to my LDG Auto Ant Tuner and it matched within a second.
>
> I then changed the load to a 100W lightbulb & repeated the same thing and
> did not see any difference.
>
> So okay, the LDG is keeping the secret of whatever difference there was to
> itself.
>
> Can anyone surmise in practical terms what I did not see?
>
> Doug W5JV
>
>
>
>
> Visit https://www.qrz.com/db/W5JV for some great vacuum tube finds.
>
>
> ______________________________________________________________
> Test-Equipment mailing list
> Home: http://mailman.qth.net/mailman/listinfo/test-equipment
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Test-Equipment at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

From johnk0gcj at gmail.com  Tue May  3 13:39:00 2022
From: johnk0gcj at gmail.com (JC)
Date: Tue, 3 May 2022 12:39:00 -0500
Subject: [Test-Equipment] Same old dumb question my way:
In-Reply-To: <CALv4R2sPUUwRjDtYY6NKxjcw4=9kkW0tnbCt0jhGrUS7AHnjFw@mail.gmail.com>
References: <SA0PR19MB44092AC1508500B224780FC591C09@SA0PR19MB4409.namprd19.prod.outlook.com>
	<CALv4R2sPUUwRjDtYY6NKxjcw4=9kkW0tnbCt0jhGrUS7AHnjFw@mail.gmail.com>
Message-ID: <CALv4R2sTpndnzE=TOR3qzpt4peRrj3hh2yL9gWSLANB92Kb9WA@mail.gmail.com>

Actually, probably more like 12.6 uH.

On Tue, May 3, 2022 at 12:35 PM JC <johnk0gcj at gmail.com> wrote:

>
> I doubt that the wirewound resistor has an inductance of 12.6 Henrys. I
> would
> believe 12.6 mH.
>
> John K0GCJ
>
>
>
> On Tue, May 3, 2022 at 12:08 PM Doug Hensley <w5jv at hotmail.com> wrote:
>
>> Okay, so a good resister converts electrical power into heat.  Got it.
>>
>> I still am interested in learning how a partially inductive load would
>> affect
>> the tuning of an RF output circuit.  For example:
>>
>> I took some 250 ohm 100 W Ohmite wire wounds and configured a 50 ohm
>> array.  The inductance of a single Ohmite was around 12.6 H.  The array
>> measured 360 uH.
>>
>> I loaded my little rig into it and seemed to be okay.  Resistors got
>> mildly warm.
>> Switched over to my LDG Auto Ant Tuner and it matched within a second.
>>
>> I then changed the load to a 100W lightbulb & repeated the same thing and
>> did not see any difference.
>>
>> So okay, the LDG is keeping the secret of whatever difference there was to
>> itself.
>>
>> Can anyone surmise in practical terms what I did not see?
>>
>> Doug W5JV
>>
>>
>>
>>
>> Visit https://www.qrz.com/db/W5JV for some great vacuum tube finds.
>>
>>
>> ______________________________________________________________
>> Test-Equipment mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/test-equipment
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Test-Equipment at mailman.qth.net
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>>
>

From radiotest at plymouthcolony.net  Tue May  3 14:17:28 2022
From: radiotest at plymouthcolony.net (Dale H. Cook)
Date: Tue, 3 May 2022 14:17:28 -0400
Subject: [Test-Equipment] Same old dumb question my way:
In-Reply-To: <SA0PR19MB44092AC1508500B224780FC591C09@SA0PR19MB4409.namprd19.prod.outlook.com>
References: <SA0PR19MB44092AC1508500B224780FC591C09@SA0PR19MB4409.namprd19.prod.outlook.com>
Message-ID: <5c00a117-3bd1-3e61-31c2-2fb83c86f37f@plymouthcolony.net>

On 5/3/2022 1:07 PM, Doug Hensley wrote:

> I took some 250 ohm 100 W Ohmite wire wounds and configured a 50 ohm
> array.  The inductance of a single Ohmite was around 12.6 H.

Impossible - I have worked with 5-30 Henry inductors for decades.

On 5/3/2022 1:39 PM, John K0GCJ wrote:

 > Actually, probably more like 12.6 uH.

I concur.
-- 
Dale H. Cook, Retired Chief Engineer, Roanoke/Lynchburg, VA
https://plymouthcolony.net/starcityeng/index.html


From johnk0gcj at gmail.com  Tue May  3 15:17:57 2022
From: johnk0gcj at gmail.com (JC)
Date: Tue, 3 May 2022 14:17:57 -0500
Subject: [Test-Equipment] Same old dumb question my way:
In-Reply-To: <5c00a117-3bd1-3e61-31c2-2fb83c86f37f@plymouthcolony.net>
References: <SA0PR19MB44092AC1508500B224780FC591C09@SA0PR19MB4409.namprd19.prod.outlook.com>
	<5c00a117-3bd1-3e61-31c2-2fb83c86f37f@plymouthcolony.net>
Message-ID: <CALv4R2vs-22Gc=Ap+NuST+uw=orQoNsKZTQi6BrCDUK_mg51YQ@mail.gmail.com>

Dale, not to hijack Doug's thread(of course not, I wouldn't do that) but
I'll bet you can answer
a question I never really had a need to know but have always been a little
curious about. I know
the difference in function between a swinging choke and any old filter
choke, but what's the
difference physically? Just the core gap size?



On Tue, May 3, 2022 at 1:18 PM Dale H. Cook <radiotest at plymouthcolony.net>
wrote:

> On 5/3/2022 1:07 PM, Doug Hensley wrote:
>
> > I took some 250 ohm 100 W Ohmite wire wounds and configured a 50 ohm
> > array.  The inductance of a single Ohmite was around 12.6 H.
>
> Impossible - I have worked with 5-30 Henry inductors for decades.
>
> On 5/3/2022 1:39 PM, John K0GCJ wrote:
>
>  > Actually, probably more like 12.6 uH.
>
> I concur.
> --
> Dale H. Cook, Retired Chief Engineer, Roanoke/Lynchburg, VA
> https://plymouthcolony.net/starcityeng/index.html
>
> ______________________________________________________________
> Test-Equipment mailing list
> Home: http://mailman.qth.net/mailman/listinfo/test-equipment
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Test-Equipment at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

From radiotest at plymouthcolony.net  Tue May  3 17:23:58 2022
From: radiotest at plymouthcolony.net (Dale H. Cook)
Date: Tue, 3 May 2022 17:23:58 -0400
Subject: [Test-Equipment] Same old dumb question my way:
In-Reply-To: <CALv4R2vs-22Gc=Ap+NuST+uw=orQoNsKZTQi6BrCDUK_mg51YQ@mail.gmail.com>
References: <SA0PR19MB44092AC1508500B224780FC591C09@SA0PR19MB4409.namprd19.prod.outlook.com>
	<5c00a117-3bd1-3e61-31c2-2fb83c86f37f@plymouthcolony.net>
	<CALv4R2vs-22Gc=Ap+NuST+uw=orQoNsKZTQi6BrCDUK_mg51YQ@mail.gmail.com>
Message-ID: <23fa546b-8a58-fbcb-5203-b5e20a704e5f@plymouthcolony.net>

On 5/3/2022 3:17 PM, John K0GCJ wrote:

> I know
> the difference in function between a swinging choke and any old filter
> choke, but what's the
> difference physically? Just the core gap size?

The primary physical difference is that a swinging choke has two or more 
core gaps.
-- 
Dale H. Cook, Retired Chief Engineer, Roanoke/Lynchburg, VA
https://plymouthcolony.net/starcityeng/index.html


From k0xp at k0xp.com  Tue May  3 17:34:49 2022
From: k0xp at k0xp.com (Steve Harrison)
Date: Tue, 3 May 2022 14:34:49 -0700
Subject: [Test-Equipment] Same old dumb question my way:
In-Reply-To: <23fa546b-8a58-fbcb-5203-b5e20a704e5f@plymouthcolony.net>
References: <SA0PR19MB44092AC1508500B224780FC591C09@SA0PR19MB4409.namprd19.prod.outlook.com>
	<5c00a117-3bd1-3e61-31c2-2fb83c86f37f@plymouthcolony.net>
	<CALv4R2vs-22Gc=Ap+NuST+uw=orQoNsKZTQi6BrCDUK_mg51YQ@mail.gmail.com>
	<23fa546b-8a58-fbcb-5203-b5e20a704e5f@plymouthcolony.net>
Message-ID: <ccfa94d5-4d40-871a-34d6-fccf03464fe4@k0xp.com>

On 5/3/2022 2:23 PM, Dale H. Cook wrote:
> On 5/3/2022 3:17 PM, John K0GCJ wrote:
>
>> I know
>> the difference in function between a swinging choke and any old filter
>> choke, but what's the
>> difference physically? Just the core gap size?
>
> The primary physical difference is that a swinging choke has two or 
> more core gaps.

The Bill Orr handbooks have pretty good descriptions and explanations.

SteveH K0XP


From johnk0gcj at gmail.com  Tue May  3 19:27:23 2022
From: johnk0gcj at gmail.com (JC)
Date: Tue, 3 May 2022 18:27:23 -0500
Subject: [Test-Equipment] Same old dumb question my way:
In-Reply-To: <ccfa94d5-4d40-871a-34d6-fccf03464fe4@k0xp.com>
References: <SA0PR19MB44092AC1508500B224780FC591C09@SA0PR19MB4409.namprd19.prod.outlook.com>
	<5c00a117-3bd1-3e61-31c2-2fb83c86f37f@plymouthcolony.net>
	<CALv4R2vs-22Gc=Ap+NuST+uw=orQoNsKZTQi6BrCDUK_mg51YQ@mail.gmail.com>
	<23fa546b-8a58-fbcb-5203-b5e20a704e5f@plymouthcolony.net>
	<ccfa94d5-4d40-871a-34d6-fccf03464fe4@k0xp.com>
Message-ID: <CALv4R2vsHqeCVRRR15SWpgmgPCvpTed6de_1jrfwN0toV+tgRw@mail.gmail.com>

Thanks. My Orr book is packed away awaiting a new home. Been a long time
since I got into HV supplies.

John K0GCJ

On Tue, May 3, 2022 at 4:35 PM Steve Harrison <k0xp at k0xp.com> wrote:

> On 5/3/2022 2:23 PM, Dale H. Cook wrote:
> > On 5/3/2022 3:17 PM, John K0GCJ wrote:
> >
> >> I know
> >> the difference in function between a swinging choke and any old filter
> >> choke, but what's the
> >> difference physically? Just the core gap size?
> >
> > The primary physical difference is that a swinging choke has two or
> > more core gaps.
>
> The Bill Orr handbooks have pretty good descriptions and explanations.
>
> SteveH K0XP
>
> ______________________________________________________________
> Test-Equipment mailing list
> Home: http://mailman.qth.net/mailman/listinfo/test-equipment
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Test-Equipment at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

From w5jv at hotmail.com  Tue May  3 21:30:03 2022
From: w5jv at hotmail.com (Doug Hensley)
Date: Wed, 4 May 2022 01:30:03 +0000
Subject: [Test-Equipment] Same old dumb question my way:
Message-ID: <SA0PR19MB4409854A16C31BC0393639E591C39@SA0PR19MB4409.namprd19.prod.outlook.com>

Guys I will remeasure these tomorrow.  i used one of those little
Chinese microprocessor controlled L/C meters.  I have an older
Sencore meter which I should have used.  I will also put my Rig Expert
analyzer on it and see what it says.

Regardless of what I get, the baby that was tossed out with the
bath water was the question when loading an old rig prior to putting
it on the antenna, I could not see any difference between tuning up
on the light bulb or tuning up on the Ohmite cluster?  This was
especially true when I inserted a little LDG box in the train.  Dipping
the plate & peaking the grid felt identical either way.  Once switched
over, there was no need to change those settings.

Doug W5JV





Visit https://www.qrz.com/db/W5JV for some great vacuum tube finds.



From 1oldlens1 at ix.netcom.com  Tue May 10 22:57:52 2022
From: 1oldlens1 at ix.netcom.com (Richard Knoppow)
Date: Tue, 10 May 2022 19:57:52 -0700
Subject: [Test-Equipment] Same old dumb question my way:
In-Reply-To: <CALv4R2vsHqeCVRRR15SWpgmgPCvpTed6de_1jrfwN0toV+tgRw@mail.gmail.com>
References: <SA0PR19MB44092AC1508500B224780FC591C09@SA0PR19MB4409.namprd19.prod.outlook.com>
	<5c00a117-3bd1-3e61-31c2-2fb83c86f37f@plymouthcolony.net>
	<CALv4R2vs-22Gc=Ap+NuST+uw=orQoNsKZTQi6BrCDUK_mg51YQ@mail.gmail.com>
	<23fa546b-8a58-fbcb-5203-b5e20a704e5f@plymouthcolony.net>
	<ccfa94d5-4d40-871a-34d6-fccf03464fe4@k0xp.com>
	<CALv4R2vsHqeCVRRR15SWpgmgPCvpTed6de_1jrfwN0toV+tgRw@mail.gmail.com>
Message-ID: <8928d240-39bf-57bb-5ae9-f2116663463d@ix.netcom.com>

    I am pretty sure (but didn't look) that there is at least one 
edition of the "Radio Handbook" edited by Bill Orr on <tubebooks.org>
    Probably also at <worldradiohistory.org>

On 5/3/2022 4:27 PM, JC wrote:
> Thanks. My Orr book is packed away awaiting a new home. Been a long time
> since I got into HV supplies.
> 
> John K0GCJ
> 
> On Tue, May 3, 2022 at 4:35 PM Steve Harrison <k0xp at k0xp.com> wrote:
> 
>> On 5/3/2022 2:23 PM, Dale H. Cook wrote:
>>> On 5/3/2022 3:17 PM, John K0GCJ wrote:
>>>
>>>> I know
>>>> the difference in function between a swinging choke and any old filter
>>>> choke, but what's the
>>>> difference physically? Just the core gap size?
>>>
>>> The primary physical difference is that a swinging choke has two or
>>> more core gaps.
>>
>> The Bill Orr handbooks have pretty good descriptions and explanations.
>>
>> SteveH K0XP
>>
>> ______________________________________________________________
>> Test-Equipment mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/test-equipment
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Test-Equipment at mailman.qth.net
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>>
> ______________________________________________________________
> Test-Equipment mailing list
> Home: http://mailman.qth.net/mailman/listinfo/test-equipment
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Test-Equipment at mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html

-- 
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL

From 1oldlens1 at ix.netcom.com  Tue May 10 23:00:29 2022
From: 1oldlens1 at ix.netcom.com (Richard Knoppow)
Date: Tue, 10 May 2022 20:00:29 -0700
Subject: [Test-Equipment] Same old dumb question my way:
In-Reply-To: <SA0PR19MB4409854A16C31BC0393639E591C39@SA0PR19MB4409.namprd19.prod.outlook.com>
References: <SA0PR19MB4409854A16C31BC0393639E591C39@SA0PR19MB4409.namprd19.prod.outlook.com>
Message-ID: <c3d11276-2ab2-3d5f-6480-b17466e84091@ix.netcom.com>

    I've used incandescent lamps as dummy loads many times but 
beware they are not constant resistance. Tungsten has a 
significant positive temperature coefficient so the lamps start 
out low resistance and get higher as they heat up. The practical 
problem is that the cold resistance as measured with an ohm meter 
may be pretty far off from the hot resistance which is probably 
what you get as a dummy load, unless its a very high wattage bulb.

On 5/3/2022 6:30 PM, Doug Hensley wrote:
> Guys I will remeasure these tomorrow.  i used one of those little
> Chinese microprocessor controlled L/C meters.  I have an older
> Sencore meter which I should have used.  I will also put my Rig Expert
> analyzer on it and see what it says.
> 
> Regardless of what I get, the baby that was tossed out with the
> bath water was the question when loading an old rig prior to putting
> it on the antenna, I could not see any difference between tuning up
> on the light bulb or tuning up on the Ohmite cluster?  This was
> especially true when I inserted a little LDG box in the train.  Dipping
> the plate & peaking the grid felt identical either way.  Once switched
> over, there was no need to change those settings.
> 
> Doug W5JV
> 
> 
> 
> 
> 
> Visit https://www.qrz.com/db/W5JV for some great vacuum tube finds.
> 
> 
> ______________________________________________________________
> Test-Equipment mailing list
> Home: http://mailman.qth.net/mailman/listinfo/test-equipment
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Test-Equipment at mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html

-- 
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL

From 1oldlens1 at ix.netcom.com  Tue May 10 23:34:19 2022
From: 1oldlens1 at ix.netcom.com (Richard Knoppow)
Date: Tue, 10 May 2022 20:34:19 -0700
Subject: [Test-Equipment] Same old dumb question my way:
In-Reply-To: <8928d240-39bf-57bb-5ae9-f2116663463d@ix.netcom.com>
References: <SA0PR19MB44092AC1508500B224780FC591C09@SA0PR19MB4409.namprd19.prod.outlook.com>
	<5c00a117-3bd1-3e61-31c2-2fb83c86f37f@plymouthcolony.net>
	<CALv4R2vs-22Gc=Ap+NuST+uw=orQoNsKZTQi6BrCDUK_mg51YQ@mail.gmail.com>
	<23fa546b-8a58-fbcb-5203-b5e20a704e5f@plymouthcolony.net>
	<ccfa94d5-4d40-871a-34d6-fccf03464fe4@k0xp.com>
	<CALv4R2vsHqeCVRRR15SWpgmgPCvpTed6de_1jrfwN0toV+tgRw@mail.gmail.com>
	<8928d240-39bf-57bb-5ae9-f2116663463d@ix.netcom.com>
Message-ID: <79042795-73ec-e5e4-b01f-67465a392f6a@ix.netcom.com>

    Should be
<worldradiohistory.com>

On 5/10/2022 7:57 PM, Richard Knoppow wrote:
>  ?? I am pretty sure (but didn't look) that there is at least one 
> edition of the "Radio Handbook" edited by Bill Orr on 
> <tubebooks.org>
>  ?? Probably also at <worldradiohistory.org>
> 
> On 5/3/2022 4:27 PM, JC wrote:
>> Thanks. My Orr book is packed away awaiting a new home. Been a 
>> long time
>> since I got into HV supplies.
>>
>> John K0GCJ
>>
>> On Tue, May 3, 2022 at 4:35 PM Steve Harrison <k0xp at k0xp.com> 
>> wrote:
>>
>>> On 5/3/2022 2:23 PM, Dale H. Cook wrote:
>>>> On 5/3/2022 3:17 PM, John K0GCJ wrote:
>>>>
>>>>> I know
>>>>> the difference in function between a swinging choke and any 
>>>>> old filter
>>>>> choke, but what's the
>>>>> difference physically? Just the core gap size?
>>>>
>>>> The primary physical difference is that a swinging choke has 
>>>> two or
>>>> more core gaps.
>>>
>>> The Bill Orr handbooks have pretty good descriptions and 
>>> explanations.
>>>
>>> SteveH K0XP
>>>
>>> ______________________________________________________________
>>> Test-Equipment mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/test-equipment
>>> Help: http://mailman.qth.net/mmfaq.htm
>>> Post: mailto:Test-Equipment at mailman.qth.net
>>>
>>> This list hosted by: http://www.qsl.net
>>> Please help support this email list: 
>>> http://www.qsl.net/donate.html
>>>
>> ______________________________________________________________
>> Test-Equipment mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/test-equipment
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Test-Equipment at mailman.qth.net
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: 
>> http://www.qsl.net/donate.html
> 

-- 
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL

