[AMRadio] Speech processing technologies and methods?

Bry Carling bcarling at cfl.rr.com
Thu Dec 19 11:56:49 EST 2013

It sounds like the first order of business for me with a transmittal like that would be to replace the 5Z 4 tube with solid-state rectifiers!

Bry Carling
Sent with my iPhone 6

> On Dec 19, 2013, at 11:47 AM, "Todd, KA1KAQ" <ka1kaq at gmail.com> wrote:
> On Thu, Dec 19, 2013 at 6:26 AM, FRANK HUGHES hughes <
> frsahu0003 at embarqmail.com> wrote:
>> Hi,
>> I would like to learn about the speech processor options/techniques to
>> improve what I am presenting the 32V-2 input with.
>> Should I start by asking Ray @ ER if he has any back-issues addressing the
>> subject?
> I would add to what Rob said here, there's really not a lot the 32V series
> needs to sound decent. They sound pretty good right out of the box. Like
> other rigs of the day they are somewhat restricted.
> The mic you're using sounds like a dynamic, not the best mate for the 32V.
> Simplest improvement you can make and IMO the best bang for your buck is to
> use a plain jane D-104 with a *good* crystal element. If you want to make a
> simple modification to improve the audio further, change the mic amp grid
> input resistor which, IIRC, is around 1 meg. Change it to something around
> 5 megs or more.
> Beyond that you'll be pushing the boulder uphill, a lot of work for minimal
> return.
> On 3885 I hear many folks discussing their signal processing methods, and
>> can see that it would be fun to learn more about it.
> Keep in mind that many of these guys are using homebrew transmitters, not
> 32Vs or Apaches. The biggest weakness in the 32V is the LV transformer that
> gets baked by a combination of elevated line voltage and a sizzling hot 5Z4
> half an inch away that will take the skin off your fingers if you grab it
> before it's cooled off. It's likely not too dramatic to say that it's just
> a matter of time until you fry it if you use the transmitter a lot -
> especially if you started modifying and driving the snot out of it. I have
> a stock 32V-2 that has only seen service as a 100 watt peanut whistle
> station and it has tar seeping out of the transformer. The best thing you
> can do for the transmitter is work to cool off the LV section.
> But first, I have to finish my first attempt at a homebrew amp, then on to
>> new technical horizons.
> I'm with others here: if you're building an amp along the lines of 'DTC,
> don't bother driving it with a 32V. Keep that as a daytime transmitter for
> 75/80 meters, or 40m use. Build yourself a little Class E transmitter, a
> little tube exciter, or run a Flex or something along those lines with the
> amp. You'll be pleased with the results and the 32V will be forever
> thankful.
> BTW, you probably already know that, along with your other amps, the 32V
> doesn't do 160 either.
> ~ Todd,  KA1KAQ/4
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