[Amps] Stripline design

[Carl]

Put it on a web site

Carl



----- Original Message ----- 
From: "Alex Eban" <alexeban at gmail.com>
To: "'jeff millar'" <jeff at wa1hco.net>; "'Roger'" <sub1 at rogerhalstead.com>
Cc: <amps at contesting.com>
Sent: Monday, November 16, 2009 4:54 AM
Subject: Re: [Amps] Stripline design


> Hi guys:
> I think I have on the machine a piece of software that can help calculate 
> a
> strip line. If anybody's interested contact me.
> 73:
> Alex 4Z5KS
>
> -----Original Message-----
> From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
> Behalf Of jeff millar
> Sent: Monday, November 16, 2009 8:56 AM
> To: Roger
> Cc: amps at contesting.com
> Subject: Re: [Amps] Stripline design
>
> Roger...
>
> The best place for design examples of 2 meter amplifiers is
> http://www.nd2x.net/base-1.html It's aimed at amps using the Russian tubes
> but the designs work with any tube having a similar size and plate
> capacitance.
>
> My personal favorite is the PA3CSG half wave line approach because it uses
> very few specialized components and doesn't run high circulating current
> through any capacitors or joints in metal pieces, but it does result in a
> physically large amplifier.
> http://www.nd2x.net/PA3CSG-2.html
>
> Assuming you use capacitive flappers for tuning power output coupling, 
> it's
> very easy to design a stripline by cut and try. The strip line is designed
> to be physically large with a lot of surface area for current carrying. 
> Some
> people talk about making it be a certain impedance, but that's totally not 
> a
> factor. Wide lines have lower inductance and have to be longer, that's 
> all.
> To set the line length, uses an impedance bridge on the output port, or
> couple a grid dipper into the cavity with the cover mostly on and adjust
> length with tune and load flappers at mid range.
>
> The W6PO design uses two quarter wave lines on each side, presumably to
> balance currents, but that doesn't seem necessary on 2M.
>
> jeff, wa1hco
>
> Roger wrote:
>> I'm looking at building a 2-meter amp using a stripline with a pair of
>> 3-CX800's or 4CX-800's, but I've not found any real data on the design
>> (dimensions) of the actual strip line.  Another possibility is
>> building the 6 'n 2 amp in the ARRL classic amp design handbook. I
>> also have a Henry 2002A using a single 3CX-800 with a strip line.
>>
>> Unlike using the tube characteristics and designing a standard Pi or
>> Pi-L network for a given Q, I've found no information on strip lines
>> in any of the hand books.  Yes, there were a couple of amps using one
>> and the dimensions were given, but if the design information was there
>> I missed it.
>>
>> The only thing I found on the net were the download sites that appear
>> free until you give them your information and then they want you to
>> pay.  I'd probably sign up if they told me the charges up front.
>>
>> 73
>>
>> Roger (K8RI
>
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