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Re: OT: Transformer oil in DL's

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George & Jan

Re: OT: Transformer oil in DL's

Ken
Broadcast transmitters delivered from RCA & GE up to at least 1968 had PCBs
in the oil filled capacitors and some transformers. I know this because I
had to spend a significant portion of the transmitter replacement budget
just to mitigate our disposable liability. Prior to replacing, the equipment
had to be inspected & logged to make sure they were not leaking - quarterly
I think.

[snip]
. . .that the "transformer oil" that was available to --most-- scrounging
hams since the introduction of the Cantenna
was -unlikely- to contain PCB's.

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Jeff Hall, W6UX

Need to select a dummy load for K3 TX calibration...(advice?)

Hello all,

I need help picking out a proper dummy load to use for calibrating my new
K3. HRO is just up the road and they carry some of the less expensive MFJ
dummy loads -- would these be sufficient? Not looking to spend a lot of
money, but don't want to buy junk either. What factors should I consider?
I'm assuming oil-cooled dummy loads are more robust, while air-cooled loads
are more compact, but you have to be more careful when operating or they can
burn up more easily. The K3 manual says this is just a 5W test and I need a
load with low VSWR from 160 to 6. What is considered "low" SWR? Anything
under 1:5?

If I can get by with the MFJ-260 for just $40, that sounds reasonable to me.

73 de Jeff, W6EZY
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Re: Need to select a dummy load for K3 TX calibration...(advice?)

Jeff, I would consider an ohm meter reading of a non-inductive resistor to be a better indicator of low SWR than any available SWR meter including the famous Bird (available since about 1940 or before). My MFJ-989C tuner includes a dummy load rated at 300 watts. It appears identical to the 50 ohm resistor in my 35 year old Heath Cantenna but without the can of cooling oil. I also have a 15 watt dummy load that I bought from Radio Shack about 20 years ago that measures 50 or 51 ohms. I would consider any of these good enough to calibrate a watt meter or an SWR meter. Rectifying and measuring the RF voltage will probably induce more error than the resistor.
Willis 'Cookie' Cooke
K5EWJ

________________________________
From: "Jeff Hall, W6EZY" <[hidden email]>
To: [hidden email]
Sent: Tue, February 23, 2010 12:13:39 PM
Subject: [Elecraft] Need to select a dummy load for K3 TX calibration...(advice?)

Hello all,

I need help picking out a proper dummy load to use for calibrating my new
K3. HRO is just up the road and they carry some of the less expensive MFJ
dummy loads -- would these be sufficient? Not looking to spend a lot of
money, but don't want to buy junk either. What factors should I consider?
I'm assuming oil-cooled dummy loads are more robust, while air-cooled loads
are more compact, but you have to be more careful when operating or they can
burn up more easily. The K3 manual says this is just a 5W test and I need a
load with low VSWR from 160 to 6. What is considered "low" SWR? Anything
under 1:5?

If I can get by with the MFJ-260 for just $40, that sounds reasonable to me.

73 de Jeff, W6EZY
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John-483

Re: Need to select a dummy load for K3 TX calibration...(advice?)

In reply to this post by Jeff Hall, W6UX

At 11:13 AM 23/02/10, you wrote:
>Hello all,
>
>I need help picking out a proper dummy load to use for calibrating my new
>K3.

How about the Elecraft DL1. It's easy to build, works great!

John
k7up
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N5GE

Re: Need to select a dummy load for K3 TX calibration...(advice?)

In reply to this post by Jeff Hall, W6UX

On Tue, 23 Feb 2010 10:13:39 -0800, "Jeff Hall, W6EZY"
<[hidden email]> wrote:

I don't know about the MFJ dummy loads, but I would get low powered
air cooled load for it. I use a 25 watt air cooled that I got at a
ham fest for most of the testing here. Beware and take an ohm meter
with you if you plan to buy one at a ham fest. Not long ago I bought
what I thought was a 50 ohm 300 watt air cooled dummy load. When I
got it home it measured 78 ohms.

Tom, N5GE

[hidden email]
K3 #806 with SUB RX, K3 #1055, PR6,
XV144, XV432, KRC2,
W1, 2 W2's and other small kits

1 K144XV on order

http://www.n5ge.com
http://www.swotrc.net

>
>I need help picking out a proper dummy load to use for calibrating my new
>K3. HRO is just up the road and they carry some of the less expensive MFJ
>dummy loads -- would these be sufficient? Not looking to spend a lot of
>money, but don't want to buy junk either. What factors should I consider?
>I'm assuming oil-cooled dummy loads are more robust, while air-cooled loads
>are more compact, but you have to be more careful when operating or they can
>burn up more easily. The K3 manual says this is just a 5W test and I need a
>load with low VSWR from 160 to 6. What is considered "low" SWR? Anything
>under 1:5?
>
>If I can get by with the MFJ-260 for just $40, that sounds reasonable to me.
>
>73 de Jeff, W6EZY

Amateur Radio Operator N5GE

k0wa@swbell.net

Re: Need to select a dummy load for K3 TX calibration...(advice?)

In reply to this post by Jeff Hall, W6UX

Jeff,

The MFJ will work just fine. I use a similar one from Drake which is air cooled for 100 watts. You should not put in a KW into the dummy load...but the MFJ would work OK. MFJ-260C. At 100 watts out...you can use it for 1.5 minutes. Or 25 watts continuous. This should work fine for what you need.

Lee - K0WA

Ham Radio Operators: Kansas QSO Party is August 28-29, 2010. See www.ksqsoparty.org for details

In our day and age it seems that Common Sense is in short supply. If you don't have any Common Sense - get some Common Sense and use it. If you can't find any Common Sense, ask for help from somebody who has some Common Sense. Is Common Sense divine?

Common Sense is the image of the Creator expressing revealed truth in my mind. - J. Wolf

________________________________
From: "Jeff Hall, W6EZY" <[hidden email]>
To: [hidden email]
Sent: Tue, February 23, 2010 12:13:39 PM
Subject: [Elecraft] Need to select a dummy load for K3 TX calibration...(advice?)

Hello all,

I need help picking out a proper dummy load to use for calibrating my new
K3. HRO is just up the road and they carry some of the less expensive MFJ
dummy loads -- would these be sufficient? Not looking to spend a lot of
money, but don't want to buy junk either. What factors should I consider?
I'm assuming oil-cooled dummy loads are more robust, while air-cooled loads
are more compact, but you have to be more careful when operating or they can
burn up more easily. The K3 manual says this is just a 5W test and I need a
load with low VSWR from 160 to 6. What is considered "low" SWR? Anything
under 1:5?

If I can get by with the MFJ-260 for just $40, that sounds reasonable to me.

73 de Jeff, W6EZY
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Dick Dievendorff

Re: Need to select a dummy load for K3 TX calibration...(advice?)

In reply to this post by Jeff Hall, W6UX

Jeff: It all depends on the power level you want the load to handle. Do
you want to acquire now a dummy load that will handle the output of a KW
amplifier in the future, or just the output of your K3?

If it's just the K3, then the MFJ-260C at $40 or so should be fine for 100W
for extended periods at the calibration frequencies from 3.7 - 52 MHz.

I burned up a much smaller MFJ unit that was an integrated PL-259 and a
cylindrical heat sink that could handle 100 watts for very very short
periods. During K3 Utility development I stopped the Tx Gain calibration
code with a debugger with K3 key down for a bit too long and it Is No More.
I don't find that unit in MFJ's catalog now, though.

The Tx Gain calibration holds key down for a few seconds (maybe two to ten)
on each HF band at 5 and 50 watts in quick succession.

You might want to acquire a BNC to PL-259 adapter so that you can put your
50 ohm dummy load onto the XVTR OUT BNC connector for the milliwatt Tx Gain
calibration step. That calibration really wants a 50 ohm load, although the
power requirement is very small.

For K3 Utility development when I run Tx Gain calibration over and over, I
keep a Elecraft DL-1 on the XVTR out connector and an AEA DL-1500 (which is
overkill) on the main rig ANT2 connector.

73 de Dick, K6KR

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Jeff Hall, W6EZY
Sent: Tuesday, February 23, 2010 10:14 AM
To: [hidden email]
Subject: [Elecraft] Need to select a dummy load for K3 TX
calibration...(advice?)

Hello all,

I need help picking out a proper dummy load to use for calibrating my new
K3. HRO is just up the road and they carry some of the less expensive MFJ
dummy loads -- would these be sufficient? Not looking to spend a lot of
money, but don't want to buy junk either. What factors should I consider?
I'm assuming oil-cooled dummy loads are more robust, while air-cooled loads
are more compact, but you have to be more careful when operating or they can
burn up more easily. The K3 manual says this is just a 5W test and I need a
load with low VSWR from 160 to 6. What is considered "low" SWR? Anything
under 1:5?

If I can get by with the MFJ-260 for just $40, that sounds reasonable to me.

73 de Jeff, W6EZY
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n7ws

Re: Need to select a dummy load for K3 TX calibration...(advice?)

In reply to this post by Jeff Hall, W6UX

In the good old days you would just build one. Six 300 ohm 1W resistors in parallel between a couple of sheets of PC board, tin can lids or whatever, with a coax connector mounted on one side and the center conductor attached to the opposite sheet and you're done.

Older ARRL Handbooks showed something like this---at least my 1999 does---but the new-fangled ones assume that you will buy one. Pity.

I assume you're in a hurry so go to HRO and get the MFJ, it will be entirely adequate, as long as they remembered to solder the connections inside.

Wes

--- On Tue, 2/23/10, Jeff Hall, W6EZY <[hidden email]> wrote:

> From: Jeff Hall, W6EZY <[hidden email]>
> Subject: [Elecraft] Need to select a dummy load for K3 TX calibration...(advice?)
> To: [hidden email]
> Date: Tuesday, February 23, 2010, 11:13 AM
> Hello all,
>
> I need help picking out a proper dummy load to use for
> calibrating my new
> K3. HRO is just up the road and they carry some of
> the less expensive MFJ
> dummy loads -- would these be sufficient? Not looking to
> spend a lot of
> money, but don't want to buy junk either. What
> factors should I consider?
> I'm assuming oil-cooled dummy loads are more robust, while
> air-cooled loads
> are more compact, but you have to be more careful when
> operating or they can
> burn up more easily. The K3 manual says this is just
> a 5W test and I need a
> load with low VSWR from 160 to 6. What is considered
> "low" SWR? Anything
> under 1:5?
>
> If I can get by with the MFJ-260 for just $40, that sounds
> reasonable to me.
>
> 73 de Jeff, W6EZY

Ken Kopp-3

OT: "Lost" case and cover replies

I apologize for the bandwidth ...

I've recently found that at least two of my replies to
inquiries about Elecraft covers and/or cases have not
been received.

If you've requested information from me and have not
received a reply, please let me know and I'll resend.

73! Rose Kopp - N7HKW
[hidden email]
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Rick Dettinger-3

Re: Need to select a dummy load for K3 TX calibration...(advice?)

In reply to this post by John-483

I used the DL1 for the 50 watt test and it worked fine. I only
transmitted for a few seconds, to get a reading. It gets hot fast, at
50 watts!

73,
Rick Dettinger K7MW

On Feb 23, 2010, at 10:32 AM, John wrote:

> At 11:13 AM 23/02/10, you wrote:
>> Hello all,
>>
>> I need help picking out a proper dummy load to use for calibrating
>> my new
>> K3.
>
>
> How about the Elecraft DL1. It's easy to build, works great!
>
> John
> k7up
> ______________________________________________________________
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>
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N3PSJ-2

Re: Need to select a dummy load for K3 TX calibration...(advice?)

I have the MFJ 264
http://www.mfjenterprises.com/Product.php?productid=MFJ-264

I have been using this for about 9 months now without a problem. I use it
to tune the amp putting about 500 or 600 watts into it for short periods of
time with no problems. If you want a nice one that you wont outgrow for a
while I would recommend it. I don't like the idea of a can of oil sitting
in the house, and why have that heavy paint can full of oil sitting around
when you can put this little air cooled unit on the shelf. All for about
$75.00.

Of course this is overkill for what you need now, but you might consider it
if you ever plan on an amp in the future.

Ken KE3C
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Ken Nicely (N3PSJ)

Brett Howard

Re: Need to select a dummy load for K3 TX calibration...(advice?)

In reply to this post by Jeff Hall, W6UX

If you're in a hurry you've already bought the MFJ from HRO. If you
want to be a little more frugal you can get an adequate one here for 12
bucks!

I know it says its a 75watt load but it will do 100 for long enough to
get the job done and the K3 only calibrates at 50 any way...

https://www.ridgeequipment.com/store/dummyloads.html

~Brett

On Tue, 2010-02-23 at 10:13 -0800, Jeff Hall, W6EZY wrote:

> Hello all,
>
> I need help picking out a proper dummy load to use for calibrating my new
> K3. HRO is just up the road and they carry some of the less expensive MFJ
> dummy loads -- would these be sufficient? Not looking to spend a lot of
> money, but don't want to buy junk either. What factors should I consider?
> I'm assuming oil-cooled dummy loads are more robust, while air-cooled loads
> are more compact, but you have to be more careful when operating or they can
> burn up more easily. The K3 manual says this is just a 5W test and I need a
> load with low VSWR from 160 to 6. What is considered "low" SWR? Anything
> under 1:5?
>
> If I can get by with the MFJ-260 for just $40, that sounds reasonable to me.
>
> 73 de Jeff, W6EZY
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
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Don Nelson

Re: Need to select a dummy load for K3 TX calibration...(advice?)

On 2/24/2010 9:41 AM, Brett Howard wrote:

> If you're in a hurry you've already bought the MFJ from HRO. If you
> want to be a little more frugal you can get an adequate one here for 12
> bucks!
>
> I know it says its a 75watt load but it will do 100 for long enough to
> get the job done and the K3 only calibrates at 50 any way...
>
> https://www.ridgeequipment.com/store/dummyloads.html
>
> ~Brett
>
> On Tue, 2010-02-23 at 10:13 -0800, Jeff Hall, W6EZY wrote:
>
>> Hello all,
>>
>> I need help picking out a proper dummy load to use for calibrating my new
>> K3. HRO is just up the road and they carry some of the less expensive MFJ
>> dummy loads -- would these be sufficient? Not looking to spend a lot of
>> money, but don't want to buy junk either. What factors should I consider?
>> I'm assuming oil-cooled dummy loads are more robust, while air-cooled loads
>> are more compact, but you have to be more careful when operating or they can
>> burn up more easily. The K3 manual says this is just a 5W test and I need a
>> load with low VSWR from 160 to 6. What is considered "low" SWR? Anything
>> under 1:5?
>>
>> If I can get by with the MFJ-260 for just $40, that sounds reasonable to me.
>>
>> 73 de Jeff, W6EZY
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>>
>
> ______________________________________________________________
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>
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>
>
>
> No virus found in this incoming message.
> Checked by AVG - www.avg.com
> Version: 8.5.435 / Virus Database: 271.1.1/2707 - Release Date: 02/24/10 07:34:00
>
>

The same seller is selling this dummy load for less on ebay and the
shipping is less via ebay.

http://cgi.ebay.com/50-Ohm-Dummy-Load-75-Watts-VERY-NICE-1973_W0QQitemZ250584212024QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item3a57fba238

Don, N0YE
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N9QR

Re: Need to select a dummy load for K3 TX calibration...(advice?)

In reply to this post by Brett Howard

..... nice load but it's about $9 to ship it so total will run about $21 ... still a good deal!

Thanks Brett!

-----Original Message-----
From: Brett Howard <[hidden email]>
To: Jeff Hall, W6EZY <[hidden email]>
Cc: [hidden email]
Sent: Wed, Feb 24, 2010 11:41 am
Subject: Re: [Elecraft] Need to select a dummy load for K3 TX calibration...(advice?)

If you're in a hurry you've already bought the MFJ from HRO. If you
want to be a little more frugal you can get an adequate one here for 12
bucks!

I know it says its a 75watt load but it will do 100 for long enough to
get the job done and the K3 only calibrates at 50 any way...

https://www.ridgeequipment.com/store/dummyloads.html

~Brett

On Tue, 2010-02-23 at 10:13 -0800, Jeff Hall, W6EZY wrote:

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Tom Hammond-2

Re: Need to select a dummy load for K3 TX calibration...(advice?)

In reply to this post by Don Nelson

FWIW - Last time I spoke with the folks at Ridge Equipt., they had 'a few'
100W-150W loads available as well as those shown on their web page...
apparently not enough to make it worth reworking the web page to show them
however.

You might want to give them a phone call and see what they might have that's
not shown on the web site.... 410 549-7661.

Those they show on the site are GREAT and well worth the $$. Though they will
'handle' short periods of overload, I'd not do so for very long at all. They
are 'rated' for 100% duty cycle at something BELOW the 'advertised' power
levels... e.g. the "75W" dummy load is more conservatively rated (elsewhere)
at 65W, and, after having looked inside the load (I have one) I'd not want
to push my luck too far by exceeding 65W for too long a time. They're good,
but they're NOT SUPERMAN!

73,

Tom N0SS

At 11:22 02/24/2010, Don Nelson wrote:

>On 2/24/2010 9:41 AM, Brett Howard wrote:
> > If you're in a hurry you've already bought the MFJ from HRO. If you
> > want to be a little more frugal you can get an adequate one here for 12
> > bucks!
> >
> > I know it says its a 75watt load but it will do 100 for long enough to
> > get the job done and the K3 only calibrates at 50 any way...
> >
> > https://www.ridgeequipment.com/store/dummyloads.html
> >
> > ~Brett
> >
> > On Tue, 2010-02-23 at 10:13 -0800, Jeff Hall, W6EZY wrote:
> >
> >> Hello all,
> >>
> >> I need help picking out a proper dummy load to use for calibrating my new
> >> K3. HRO is just up the road and they carry some of the less expensive MFJ
> >> dummy loads -- would these be sufficient? Not looking to spend a lot of
> >> money, but don't want to buy junk either. What factors should I consider?
> >> I'm assuming oil-cooled dummy loads are more robust, while
> air-cooled loads
> >> are more compact, but you have to be more careful when operating
> or they can
> >> burn up more easily. The K3 manual says this is just a 5W test
> and I need a
> >> load with low VSWR from 160 to 6. What is considered "low" SWR? Anything
> >> under 1:5?
> >>
> >> If I can get by with the MFJ-260 for just $40, that sounds
> reasonable to me.
> >>
> >> 73 de Jeff, W6EZY
> >> ______________________________________________________________
> >> Elecraft mailing list
> >> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> >> Help: http://mailman.qth.net/mmfaq.htm
> >> Post: mailto:[hidden email]
> >>
> >> This list hosted by: http://www.qsl.net
> >> Please help support this email list: http://www.qsl.net/donate.html
> >>
> >
> > ______________________________________________________________
> > Elecraft mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/elecraft
> > Help: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:[hidden email]
> >
> > This list hosted by: http://www.qsl.net
> > Please help support this email list: http://www.qsl.net/donate.html
> >
> >
> >
> > No virus found in this incoming message.
> > Checked by AVG - www.avg.com
> > Version: 8.5.435 / Virus Database: 271.1.1/2707 - Release Date:
> 02/24/10 07:34:00
> >
> >
>The same seller is selling this dummy load for less on ebay and the
>shipping is less via ebay.
>
>http://cgi.ebay.com/50-Ohm-Dummy-Load-75-Watts-VERY-NICE-1973_W0QQitemZ250584212024QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item3a57fba238
>
>Don, N0YE
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Don Wilhelm-4

Re: Need to select a dummy load for K3 TX calibration...(advice?)

In reply to this post by Don Nelson

Don,

He is *offering* it up for bid at a starting price of $9.99 - that is
not the same as "selling" it. Who knows the bidding may go up to $50
before the 3 days have ended.

So many people tell me about things like that quoting the bid price, but
when I look, the price is always higher. Please clarify if it is a
bidding price or a selling price (as in BUY NOW)

BTW, the Ridge Equipment dummy loads are very good. Too bad they no
longer have the 200 watt load nearly flat up to 1 GHz. I should have
gotten 2 or 3 instead of only one.

73,
Don W3FPR

Don Nelson wrote:
>
> The same seller is selling this dummy load for less on ebay and the
> shipping is less via ebay.
>
> http://cgi.ebay.com/50-Ohm-Dummy-Load-75-Watts-VERY-NICE-1973_W0QQitemZ250584212024QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item3a57fba238
>
> Don, N0YE
>
>
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N9QR

Re: Need to select a dummy load for K3 TX calibration...(advice?)

In reply to this post by Jeff Hall, W6UX

Ridge has been a good source of O'Scope's and repair items also ... they
had the original manuals and a couple of parts I needed for my Tek 2445A
scope at very fair prices. They also have excellent customer service! I
didn't buy the 200 Watt load ... thought I'd wait ... really a "Senior Moment"
as it turns out.

73, Mike N9QR

In a message dated 2/24/2010 1:06:46 P.M. Eastern Standard Time,
[hidden email] writes:

Don,

He is *offering* it up for bid at a starting price of $9.99 - that is
not the same as "selling" it. Who knows the bidding may go up to $50
before the 3 days have ended.

So many people tell me about things like that quoting the bid price, but
when I look, the price is always higher. Please clarify if it is a
bidding price or a selling price (as in BUY NOW)

BTW, the Ridge Equipment dummy loads are very good. Too bad they no
longer have the 200 watt load nearly flat up to 1 GHz. I should have
gotten 2 or 3 instead of only one.

73,
Don W3FPR

Don Nelson wrote:
>
> The same seller is selling this dummy load for less on ebay and the
> shipping is less via ebay.
>
>
http://cgi.ebay.com/50-Ohm-Dummy-Load-75-Watts-VERY-NICE-1973_W0QQitemZ250584212024QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item3a57fba238
>
> Don, N0YE
>
>
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Brett Howard

Re: Need to select a dummy load for K3 TX calibration...(advice?)

In reply to this post by N9QR

Yea its 21 bucks but I really like mine! I've got a Bird dummy that is
flat to about 3Ghz and can handle 100W 100% duty cycle but I find the
Ridge Equipment one to be more than enough most of the time...

~Brett (KC7OTG)

On Wed, 2010-02-24 at 12:29 -0500, [hidden email] wrote:

> ..... nice load but it's about $9 to ship it so total will run about
> $21 ... still a good deal!
>
> Thanks Brett!
>
>
>
>
>
>
>
>
> -----Original Message-----
> From: Brett Howard <[hidden email]>
> To: Jeff Hall, W6EZY <[hidden email]>
> Cc: [hidden email]
> Sent: Wed, Feb 24, 2010 11:41 am
> Subject: Re: [Elecraft] Need to select a dummy load for K3 TX
> calibration...(advice?)
>
> If you're in a hurry you've already bought the MFJ from HRO. If you
>
> want to be a little more frugal you can get an adequate one here for 12
>
> bucks!
>
>
>
> I know it says its a 75watt load but it will do 100 for long enough to
>
> get the job done and the K3 only calibrates at 50 any way...
>
>
>
> https://www.ridgeequipment.com/store/dummyloads.html
>
>
>
> ~Brett
>
>
>
> On Tue, 2010-02-23 at 10:13 -0800, Jeff Hall, W6EZY wrote:
>
> > Hello all,
>
> >
>
> > I need help picking out a proper dummy load to use for calibrating my new
>
> > K3. HRO is just up the road and they carry some of the less expensive MFJ
>
> > dummy loads -- would these be sufficient? Not looking to spend a lot of
>
> > money, but don't want to buy junk either. What factors should I consider?
>
> > I'm assuming oil-cooled dummy loads are more robust, while air-cooled loads
>
> > are more compact, but you have to be more careful when operating or they can
>
> > burn up more easily. The K3 manual says this is just a 5W test and I need a
>
> > load with low VSWR from 160 to 6. What is considered "low" SWR? Anything
>
> > under 1:5?
>
> >
>
> > If I can get by with the MFJ-260 for just $40, that sounds reasonable to me.
>
> >
>
> > 73 de Jeff, W6EZY
>
> > ______________________________________________________________
>
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>
> >
>
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>
>
>
>
>
> ______________________________________________________________
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Dave New, N8SBE

Re: Need to select a dummy load for K3 TX calibration...(advice?)

In reply to this post by Jeff Hall, W6UX

"I don't like the idea of a can of oil sitting in the house," -- in
particular, if you don't know what kind of oil might be lurking in that
old Cantenna. Note that prior to the "A" suffix models, Heath
recommended transformer oil, and had no warnings against using oils that
contained PCBs. After PCBs were outlawed in the US, Heath changed their
recommendation to mineral oil, and included a warning against the use of
transformer oil of unknown composition.

So, if you come across a vintage Cantenna at a ham fest, what do you
think might be in it? If it's the old style with the little 'house' on
top, I'd steer clear of it. The Cantenna should be disposed of, in
accordance with federal law, and under no circumstances should be opened
by untrained and unprotected personnel. Considering that most of these
Cantennas leak around the screws on the lid, I'd be very leery of any of
the 'first edition' Cantennas. The new ones, with the spiffy Red/Black
logos, should be OK, but if you have any doubt, pass it by.

73,

-- Dave, N8SBE

> -------- Original Message --------
> Subject: Re: [Elecraft] Need to select a dummy load for K3 TX
> calibration...(advice?)
> From: Ken Nicely <[hidden email]>
> Date: Tue, February 23, 2010 11:11 pm
> To: [hidden email]
>
>
> I have the MFJ 264
> http://www.mfjenterprises.com/Product.php?productid=MFJ-264
>
> I have been using this for about 9 months now without a problem. I use it
> to tune the amp putting about 500 or 600 watts into it for short periods of
> time with no problems. If you want a nice one that you wont outgrow for a
> while I would recommend it. I don't like the idea of a can of oil sitting
> in the house, and why have that heavy paint can full of oil sitting around
> when you can put this little air cooled unit on the shelf. All for about
> $75.00.
>
> Of course this is overkill for what you need now, but you might consider it
> if you ever plan on an amp in the future.
>
> Ken KE3C
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Ken Kopp-3

OT: Transformer oil in DL's

As a (retired) career power company employee I can say with
reasonable certainty that the "transformer oil" that was available
to --most-- scrounging hams since the introduction of the Cantenna
was -unlikely- to contain PCB's.

At least in the circumstances familiar to me, PCB-containing
transformer oil was mostly long gone by the time the Cantenna
was introduced. It was certainly gone "as new" out of the barrel,
but did remain in transformers already in place, but few if any
hams received their oil from a transformer. (:-)

It doesn't "make it right", but we had transformer shop employees
that literally stood chest deep in the stuff inside large substation
transformers when they were overhauled or a tap needed changed.

73! Ken Kopp - K0PP
[hidden email]
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