Re: {Collins} Wattmeter PEP



Thanks, Floyd. It sounds like you have a good product.

73, Mike
www.w0btu.com

On Fri, May 1, 2015 at 10:59 PM, Floyd Soo <floydsoo@xxxxxxxxxxxxx> wrote:

> Mike, et al,
>
> I guess I am going to have to chime in here. Our PDC-1 Peak Reading
> Adapter kit was originally designed and implemented in Collins 312B-4/5
> watt meters. Thousands of these circuits are in use worldwide not only in
> Collins watt meters, but in many others as well.
>
> Our kit does not affect the calibration or accuracy of the watt meter,
> however, it does accurately show voice peaks for SSB signals with an
> adjustable slow decay rate. This is an active circuit that uses a dual
> op-amp. In the Collins meters which utilize meter lamps, this circuit uses
> the 6.3 volt ac line for power. With a flip of the switch, you can
> immediately go right back to average reading mode.
>
> This circuit works so well, that many are even used in laboratory grade
> meters, such as the Bird, Telewave and Coaxial Dynamics units.
>
> In my personal 312B-4, I used a switch that was mounted on a bracket I
> pinched between the cabinet and the directional coupler, so as not to have
> to drill any holes...
>
> No offense, but this active circuit works better than any capacitor style
> circuit for the purpose of reading true PEP levels.
>
> Please contact me, if you have more questions on how to convert your
> average reading watt meter to true peak reading...
> --
> 73,
> Floyd Soo, W8RO
> President, Hi-Res Communications, Inc.
> Founding Member; Past President, Board Member and Net Manager, Collins
> Collectors Association
>
> Sent from my 4G LTE smart-aleck phone
>
> <div>-------- Original message --------</div><div>From: Mike Waters <
> mikewate@xxxxxxxxx> </div><div>Date:05/01/2015  6:40 PM  (GMT-05:00)
> </div><div>To: collins@xxxxxxxxxxxxx </div><div>Subject: Re: {Collins}
> Wattmeter PEP </div><div>
> </div>Sounds like a plan. Please let us know what the new diodes do before
> you
> add anything else.
>
> You want suggestions ... my suggestion is to make your proposed switch
> select between (1) the standard circuit (probably with the diode mod), (2)
> my 7 uF tantalum cap mod, and (3) the PEP board.
>
> In fact, before you do anything with capacitors or PEP board, why don't you
> make it so you can switch between the original diodes and the new ones?!
>
> Tantalum capacitors can have a slight advantage over electrolytics in some
> time constant circuits. (I forget the details, but maybe it's something
> about the rise/decay times being more linear). Whether it would make a
> significant difference in this case, I can't say for sure. If I had the
> tantalums, I would send you some at no charge, but I don't.
>
> Reading average power is important. My question is whether or not that PEP
> board will also show the average similar to the way that my capacitor mod
> does. Based on SSB waveforms that I've seen on a scope, and reading the
> info at http://www.redwaveradio.com/8_2835eb798927b1e7_1.htm ,  I have
> some
> nagging doubts about that.
>
> Gentlemen, I am not trying to show off or pick a fight with anyone. I
> simply am trying to learn something and share my own experiences.
>
> 73, Mike
> www.w0btu.com
>
> On Fri, May 1, 2015 at 3:28 PM, <donroden@xxxxxxxxxx> wrote:
>
> > Quoting Colin Lamb <k7fm@xxxxxxxxxxxx>:
> >
> >  I agree with Bill about the PEP wattmeter board.  I have added similar
> >> boards to a number of wattmeters.
> >>
> >
> >
> > As do I.
> >
> > I just wanted to install modern diodes before I added the pep board.
> >
> > I want to add a small  ( hidden or nearly so ) switch attached to a
> > bracket on one of the front feet of the 312B-5 and the 312B-4  to switch
> > between average  ( but correct ) and pep.   Suggestions appreciated !!
> >
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