From bill.riches at verizon.net  Sat May  4 14:22:27 2024
From: bill.riches at verizon.net (B Riches)
Date: Sat, 4 May 2024 18:22:27 +0000 (UTC)
Subject: [Test-Equipment] 6C10 Tube
References: <2063486151.5783158.1714846947320.ref@mail.yahoo.com>
Message-ID: <2063486151.5783158.1714846947320@mail.yahoo.com>

Help!? I am looking for a 6C10 tube.
73,
Bill, WA2DVUCape May, NJ

From w4byg at att.net  Tue May  7 17:47:11 2024
From: w4byg at att.net (Ray LaRue)
Date: Tue, 7 May 2024 21:47:11 +0000
Subject: [Test-Equipment] Millen 9061 GDO with low frequency coils
References: <f9a66205-3b3d-a634-c070-838c20244db1.ref@att.net>
Message-ID: <f9a66205-3b3d-a634-c070-838c20244db1@att.net>

I recently added a very nice Millen 90651 GDO to my "stash", which also 
had low frequency coils for the AM broadcast band and below. It seems 
these would be useful for the low frequency ham allocations.

However, I don't see any scales on the dial which would reveal a 
frequency of a given dip using one of these coils. I also don't see any 
clue in the manual that comes with it.

I wonder if there are any old timers on the list that know how to read 
the GDO frequency with these LF coils?
Maybe I'm just missing the obvious. Your attention is appreciated.
Ray, W4BYG

-- 
"If you want to build a strong house, I'll give you my engineer's number.
  If you want to build a strong life, I'll introduce you to my carpenter."
   Lebron and Heather Lackey


-- 
This email has been checked for viruses by AVG antivirus software.
www.avg.com

From k0xp at k0xp.com  Tue May  7 18:16:06 2024
From: k0xp at k0xp.com (Steve Harrison)
Date: Tue, 7 May 2024 15:16:06 -0700
Subject: [Test-Equipment] Millen 9061 GDO with low frequency coils
In-Reply-To: <f9a66205-3b3d-a634-c070-838c20244db1@att.net>
References: <f9a66205-3b3d-a634-c070-838c20244db1.ref@att.net>
	<f9a66205-3b3d-a634-c070-838c20244db1@att.net>
Message-ID: <17a8b6cf-6387-46ad-8039-5353f9395626@k0xp.com>

Perhaps you are to read the frequency as a harmonic from the lowest scale??

Steve, K0XP


On 5/7/2024 2:47 PM, Ray LaRue wrote:
> I recently added a very nice Millen 90651 GDO to my "stash", which
> also had low frequency coils for the AM broadcast band and below. It
> seems these would be useful for the low frequency ham allocations.
>
> However, I don't see any scales on the dial which would reveal a
> frequency of a given dip using one of these coils. I also don't see
> any clue in the manual that comes with it.
>
> I wonder if there are any old timers on the list that know how to read
> the GDO frequency with these LF coils?
> Maybe I'm just missing the obvious. Your attention is appreciated.
> Ray, W4BYG
>
--
See my QRZ.com page at *https://www.qrz.com/db/K0XP*

From radiotest at plymouthcolony.net  Tue May  7 18:16:10 2024
From: radiotest at plymouthcolony.net (Dale H. Cook)
Date: Tue, 7 May 2024 18:16:10 -0400
Subject: [Test-Equipment] Millen 9061 GDO with low frequency coils
In-Reply-To: <f9a66205-3b3d-a634-c070-838c20244db1@att.net>
References: <f9a66205-3b3d-a634-c070-838c20244db1.ref@att.net>
	<f9a66205-3b3d-a634-c070-838c20244db1@att.net>
Message-ID: <c4164e0e-5068-483a-b122-aeae5a982848@plymouthcolony.net>

On 5/7/2024 5:47 PM, Ray LaRue wrote:

> I recently added a very nice Millen 90651 GDO to my "stash", which also 
> had low frequency coils for the AM broadcast band and below. It seems 
> these would be useful for the low frequency ham allocations.
> 
> However, I don't see any scales on the dial which would reveal a 
> frequency of a given dip using one of these coils. I also don't see any 
> clue in the manual that comes with it.

The low frequency coils were supplied with a graph for reading their 
frequencies from the 0-10 scale.
-- 
Dale H. Cook, GR/HP/Tek Collector, Roanoke/Lynchburg, VA
https://plymouthcolony.net/starcity/radios/


From n2lxm at juno.com  Tue May  7 18:52:43 2024
From: n2lxm at juno.com (n2lxm at juno.com)
Date: Tue, 7 May 2024 18:52:43 -0400
Subject: [Test-Equipment] Millen 9061 GDO with low frequency coils
Message-ID: <AABVDXNGXAAKJ78S@smtpout01.vgs.untd.com>

In the manual there is a chart to plot the Low Frequency coils against
the 0 -100 scale on the GDO.



                                                    Jeff N2LXM
                                          Amateur Radio Operator
                                                      American
                                                        Patriot
                                     Proud Father of Two US Marines


From k9muf at comcast.net  Wed May  8 10:15:22 2024
From: k9muf at comcast.net (k9muf at comcast.net)
Date: Wed, 8 May 2024 08:15:22 -0600 (CST)
Subject: [Test-Equipment] Millen 9061 GDO with low frequency coils
In-Reply-To: <f9a66205-3b3d-a634-c070-838c20244db1@att.net>
References: <f9a66205-3b3d-a634-c070-838c20244db1.ref@att.net>
	<f9a66205-3b3d-a634-c070-838c20244db1@att.net>
Message-ID: <1497623387.387581.1715177722106@connect.xfinity.com>

Ray

If you have an accurately calibrated receiver or a frequency counter, you could very loosely couple it to the GDO. It must be loosely coupled                                  so as not to "pull" the GDO frequency off of it's dip. Also                                             the GDO must be very loosely coupled to the circuit being tested so as to barely get a "dip".
                                      
In fact, I use this method for the bands for which the GDO has scales for because those are very hard to read and are not very accurate.

Don







> On 05/07/2024 4:47 PM CDT Ray LaRue <w4byg at att.net> wrote:
> 
>  
> I recently added a very nice Millen 90651 GDO to my "stash", which also 
> had low frequency coils for the AM broadcast band and below. It seems 
> these would be useful for the low frequency ham allocations.
> 
> However, I don't see any scales on the dial which would reveal a 
> frequency of a given dip using one of these coils. I also don't see any 
> clue in the manual that comes with it.
> 
> I wonder if there are any old timers on the list that know how to read 
> the GDO frequency with these LF coils?
> Maybe I'm just missing the obvious. Your attention is appreciated.
> Ray, W4BYG
> 
> -- 
> "If you want to build a strong house, I'll give you my engineer's number.
>   If you want to build a strong life, I'll introduce you to my carpenter."
>    Lebron and Heather Lackey
> 
> 
> -- 
> This email has been checked for viruses by AVG antivirus software.
> www.avg.com
> ______________________________________________________________
> 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 1oldlens1 at ix.netcom.com  Wed May  8 15:04:43 2024
From: 1oldlens1 at ix.netcom.com (Richard Knoppow)
Date: Wed, 8 May 2024 12:04:43 -0700
Subject: [Test-Equipment] Test Message
Message-ID: <cb943760-7ecf-49b7-bac2-209fb4116dd9@ix.netcom.com>

    I recently sent a couple of replys to this list which did not show 
up. Nor did I get any sort of error message. Hence this test.
-- 
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998

From 1oldlens1 at ix.netcom.com  Wed May  8 15:12:59 2024
From: 1oldlens1 at ix.netcom.com (Richard Knoppow)
Date: Wed, 8 May 2024 12:12:59 -0700
Subject: [Test-Equipment] Test Message
In-Reply-To: <cb943760-7ecf-49b7-bac2-209fb4116dd9@ix.netcom.com>
References: <cb943760-7ecf-49b7-bac2-209fb4116dd9@ix.netcom.com>
Message-ID: <f85a4e30-2424-4b8d-ae96-ef22810e05c4@ix.netcom.com>

    Well, this came through fine.

On 5/8/2024 12:04 PM, Richard Knoppow wrote:
>  ?? I recently sent a couple of replys to this list which did not show 
> up. Nor did I get any sort of error message. Hence this test.

-- 
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998

From 1oldlens1 at ix.netcom.com  Wed May  8 17:23:23 2024
From: 1oldlens1 at ix.netcom.com (Richard Knoppow)
Date: Wed, 8 May 2024 14:23:23 -0700
Subject: [Test-Equipment] Millen 9061 GDO with low frequency coils
In-Reply-To: <17a8b6cf-6387-46ad-8039-5353f9395626@k0xp.com>
References: <f9a66205-3b3d-a634-c070-838c20244db1.ref@att.net>
	<f9a66205-3b3d-a634-c070-838c20244db1@att.net>
	<17a8b6cf-6387-46ad-8039-5353f9395626@k0xp.com>
Message-ID: <93b9bc52-8817-4d9a-be8a-3cace8966c40@ix.netcom.com>

    The little instruction book on BAMA has charts showing the low 
frequency coil calibration in the back. I tried to attach one to a 
message to this list but it never showed up.
    The LF coils cover most IF frequencies as well as the broadcast band 
and can be very useful.
    The charts are for the logging scale.
    BTW, the dial calibration of my Millen GDO is quite accurate.

On 5/7/2024 3:16 PM, Steve Harrison wrote:
> Perhaps you are to read the frequency as a harmonic from the lowest scale??
> 
> Steve, K0XP


-- 
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998

From 1oldlens1 at ix.netcom.com  Wed May  8 17:30:16 2024
From: 1oldlens1 at ix.netcom.com (Richard Knoppow)
Date: Wed, 8 May 2024 14:30:16 -0700
Subject: [Test-Equipment] Millen 9061 GDO with low frequency coils
In-Reply-To: <1497623387.387581.1715177722106@connect.xfinity.com>
References: <f9a66205-3b3d-a634-c070-838c20244db1.ref@att.net>
	<f9a66205-3b3d-a634-c070-838c20244db1@att.net>
	<1497623387.387581.1715177722106@connect.xfinity.com>
Message-ID: <c7b692cf-7f30-4df6-af6f-fb39a54ca935@ix.netcom.com>

    My Millen GDO is quite accurate. I wonder why yours is not. Might be 
mechanical alignment. I did find the thing is sensitive to the tube 
quality and may not oscillate on the highest frequency coil is the tube 
is weak.
    I agree about coupling, should be the minimum that gives you an 
indication.
    BTW, the meter works as a crystal tester if you make an adapter to 
connect the crystal in place of the coils. The frequency dial will then 
show the optimum capacitance load approximately and will move the 
crystal frequency around a little. A counter or radio receiver is 
necessary to read the frequency.

On 5/8/2024 7:15 AM, k9muf at comcast.net wrote:
> Ray
> 
> If you have an accurately calibrated receiver or a frequency counter, you could very loosely couple it to the GDO. It must be loosely coupled                                  so as not to "pull" the GDO frequency off of it's dip. Also                                             the GDO must be very loosely coupled to the circuit being tested so as to barely get a "dip".
>                                        
> In fact, I use this method for the bands for which the GDO has scales for because those are very hard to read and are not very accurate.
> 
> Don
> 

-- 
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998

From w4byg at att.net  Wed May  8 21:06:58 2024
From: w4byg at att.net (Ray LaRue)
Date: Thu, 9 May 2024 01:06:58 +0000
Subject: [Test-Equipment] Millen 9061 GDO with low frequency coils
References: <fe74c03e-f03e-fe01-01ed-19bde870c3de.ref@att.net>
Message-ID: <fe74c03e-f03e-fe01-01ed-19bde870c3de@att.net>

Gentlemen (several),
Thank you for directing my attention to the graphs and related usage. I 
confess I did not look close enough at them in the manual, to grasp 
their significance. I have downloaded the larger, easier to read, .jpg 
graph files on BAMA for my use.
73,
Ray, W4BYG

-- 
"If you want to build a strong house, I'll give you my engineer's number.
  If you want to build a strong life, I'll introduce you to my carpenter."
   Lebron and Heather Lackey


-- 
This email has been checked for viruses by AVG antivirus software.
www.avg.com

