[Johnson] Fwd: Re: Fwd: Attenuators for T-bolt xciters

[K9FFK]

Well, phooey. It looks like I misinterpreted the question.
A halogen lamp indeed has a tungsten filament. Whether or not it acts in 
the same manner as an incandescent lamp is the issue.
And, I don't know.
Sorry for the confusion.
Dick, K9FFK

-------- Forwarded Message --------
Subject: 	Re: [Johnson] Fwd: Attenuators for T-bolt xciters
Date: 	Sat, 11 Apr 2015 11:59:31 -0500
From: 	K9FFK <k9ffk at comcast.net>
To: 	johnson at mailman.qth.net



HI, Mike:
I hope I understand your question correctly...
I don't think you should attempt to use a CFL/halogen bulb for this purpose.
The first thing the exciter signal will see is a bridge rectifier. You
don't want to deal with the mess that will make with the RF spectrum.
The CFL/halogens are rated for light output, lumens not power consumed.
They are NOT resistive.

Look for incandescent bulbs. You can string lower power bulbs in series
if your in a pinch.

Good luck.
73 Dick K9FFK

On 3/26/2015 8:36 PM, Langston, Mike wrote:
>> Hello,
>>
>> I have a V-II that I am going to use on AM to drive a T-bolt linear. I have built up an attenuator for use between the units per the T-bolt manual schematic. It is enclosed in an alum. project box except for the 75W light bulb which is mounted on top.
>>
>> First problem was finding a 75W incandescent bulb. Closest I came was a 73W halogen bulb.
>>
>> Q1 - will that work?
>> Q2 - the bulb is not shielded. Do I need to worry about that?
>>
>> Any help appreciated.
>>
>> Mike KL7CD
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