[Milsurplus] Just had to comment - chirp

[howard holden]

Agree with Wayne!

73, Howie WB2AWQ

________________________________________
From: milsurplus-bounces at mailman.qth.net <milsurplus-bounces at mailman.qth.net> on behalf of hwhall--- via Milsurplus <milsurplus at mailman.qth.net>
Sent: Tuesday, August 20, 2024 4:08 PM
To: milsurplus at mailman.qth.net; mstangelo at comcast.net
Subject: Re: [Milsurplus] Just had to comment - chirp


The Philmore NT-200 is a two stage transmitter so I do not consider it a MOPA transmitter.

I'm not sure I understand that. I assumed that if the oscillator is a different tube than the final amplifier, then that was the meaning of a MOPA.

Wayne
WB4OGM

On Tuesday, August 20, 2024 at 07:51:00 AM MDT, mstangelo--- via Milsurplus <milsurplus at mailman.qth.net> wrote:


Thanks to all about the information about the Bruce Kelly and Philmore transmitters. The Philmore NT-200 is a two stage transmitter so I do not consider it a MOPA transmitter.

Does anyone remember the W5LET had single tube transmitters in Electronics Illustrated?

I built one using the 6AQ5A tube and it exhibited less chirp than my AC-1. It specified and coil only available from Allied Industrial division and had a long time delivery so I substituted a 4.5MHz television IF coil and it worked like a charm.

A copy of the article starts on page 100:

<https://www.worldradiohistory.com/Archive-Electronics-Illustrated/Electronics-Illustrated-1967-03.pdf<https://www.worldradiohistory.com/Archive-Electronics-Illustrated/Electronics-Illustrated-1967-03.pdf>>

Mike N2MS


> On 08/19/2024 10:16 PM EDT Robert Nickels <ranickels at gmail.com<mailto:ranickels at gmail.com>> wrote:
>
>
> On 8/19/2024 7:59 PM, Hubert Miller wrote:
>
> > Philmore had a one tube Novice type transmitter, but not many sold, quite rare.
> Hue,
> The Philmore NT-200 is a MOPA with 6V6 oscillator and 6L6 amplifier. It keys nicely - you can get the entire pictorial manual from BAMA.
>
> Did they make another ?
> 73, Bob W9RAN
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