[Amps] Peter Dahl transformers

[Jeff Blaine]

He eventually called the one I bought 1.4 KVA CCS.   I draw about 1800 KVA 
from it in RTTY contest duty and the surface temp of the core never gets 
over about 45c.

In fact, I was worried about the tradeoff of a high temp rise spec and even 
with the 200C components used, figured keeping an eye on the core temp would 
be a good idea.  So I had him build inside a thermistor which I had measured 
R vs. temp before hand.

But the transformer never warmed up as much as the "CCS" model forecasted 
and I never implemented the temp monitor.

Even for RTTY contest duty, what guys probably "need" out of a transformer 
is what we called ICAS 5/5 back in the day.  That core takes a lot longer 
than 5 minutes to cool down very much and it seems to me that it's a more 
applicable spec unless you are an AM or RTTY rag chewer where you like to 
ramble on for 30 minutes at a stretch.

73/jeff/ac0c
www.ac0c.com
alpha-charlie-zero-charlie

-----Original Message----- 
From: Carl
Sent: Thursday, February 14, 2013 12:36 PM
To: Jeff Blaine ; amps at contesting.com
Subject: Re: [Amps] Peter Dahl transformers

Yep, there is commercial CCS and ham/CB CCS; a big difference in weight and
price.

There isnt a ham amp on the market that would survive commercial CCS at its
power capability.

Carl
KM1H




----- Original Message ----- 
From: "Jeff Blaine" <keepwalking188 at yahoo.com>
To: <amps at contesting.com>
Sent: Wednesday, February 13, 2013 2:42 PM
Subject: Re: [Amps] Peter Dahl transformers


>I had a custom done by EPD.  He will build exactly what you want.  You can 
>have complete control over the compromises and material set, if you know 
>what you want specifically.
>
> He told me once that most guys start out talking about CCS specs but when 
> the size and price come into focus, they start backing off from that.
>
> 73/jeff/ac0c
> www.ac0c.com
> alpha-charlie-zero-charlie
>
> -----Original Message----- 
> From: Carl
> Sent: Monday, February 11, 2013 8:17 PM
> To: Paul Christensen ; amps at contesting.com
> Subject: Re: [Amps] Peter Dahl transformers
>
> While I dont doubt that I see a large number of CB transformers and Im 
> sure
> a number of  super power hams also. The giveaway that these are not for
> commercial use is the single phase construction no matter what the kVA
> except for 2 listed and one is for CB mobile use. He is also not shy about
> it either and shows a photo.
>
> The ICAS ratings vs weight is also interesting and even less than OEM in
> Heath, Dentron, etc, and I do not see a Style description listed.
>
> Carl
>
>
>
>
> ----- Original Message ----- 
> From: "Paul Christensen" <w9ac at arrl.net>
> To: <amps at contesting.com>
> Sent: Monday, February 11, 2013 2:03 PM
> Subject: Re: [Amps] Peter Dahl transformers
>
>
>>A few months ago, EPD was highly recommended to me by Reid Brandon when he 
>>was still with Eimac.
>>
>> Paul, W9AC
>>
>> ----- Original Message ----- 
>> From: "Coffey" <coffey at starfishnet.com>
>> To: <amps at contesting.com>
>> Sent: Sunday, February 10, 2013 3:04 PM
>> Subject: Re: [Amps] Peter Dahl transformers
>>
>>
>>> Have no fear about Harbach not making transformers.  My friend Peter 
>>> Eggimann has been making HV transformers since 1983 and has all the Dahl’s 
>>> data and specs from years  ago. He has a nice manufacturing facility in 
>>> Wendell, N.C........EPD    ....Electronic Products Design, 
>>> Inc......website: epd-inc.com. I was a customer before I retired and now 
>>> as a hobby amp builder.......Gary, K4AVC
>>> _______________________________________________
>>> Amps mailing list
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>>> http://lists.contesting.com/mailman/listinfo/amps
>>>
>>
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