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RF Speech Processors

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Rick Prather

RF Speech Processors

I almost hate to bring this up since my flame suit is out at the cleaners but before I sell my Ten-Tec 715 RF Speech Processor that is left over from my previous radio I am wondering if anyone has done a comparison between it and the built in RF processor on the K3?

I have mine wired up for the Ten-Tec mic and connector cable so I can't easily compare.

However, I can make up a patch cord to go to the rear panel and use my TT 709A mic for a test if someone cares to meet for a comparison.

I am hoping there is no advantage so I can rid my desk of one more little black box. The one thing that I can see on it that would be nice is the ability to shift the passband.

Rick
K6LE
#3727
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Brian Mury-3

Re: RF Speech Processors

On Tue, 2010-01-12 at 17:05 -0800, K6LE wrote:
> I almost hate to bring this up since my flame suit is out at the
> cleaners but before I sell my Ten-Tec 715 RF Speech Processor that is
> left over from my previous radio I am wondering if anyone has done a
> comparison between it and the built in RF processor on the K3?

I've never used one and can't answer your question, however I have been
wondering if it would be useful for the K2. So in addition to K3
comparisons for Rick, I'm also interested in K2 comparisons.

73,
Brian

P.S. Rick, if it seems that the K2 would benefit, I might be interested
in your 715! :-)

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Jim Brown-10

Re: RF Speech Processors

In reply to this post by Rick Prather

On Tue, 12 Jan 2010 17:05:05 -0800, K6LE wrote:

>I am hoping there is no advantage

I haven't tried it, nor have I seen anything from anyone who has.
BUT -- the speech processing in the K3 is VERY good and VERY
flexible, so it's hard to imagine anything you could add outboard
that could improve on it short of some really expensive pro audio
gear. All of which is why we've not heard much about folks trying RF
speech processing. :)

73,

Jim K9YC

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KK7P

Re: RF Speech Processors

In reply to this post by Rick Prather

> I am hoping there is no advantage so I can rid my desk of one more little black box. The one thing that I can see on it that would be nice is the ability to shift the passband.

In the case of the K3, the Tx EQ can be used to tailor the ultimate
sound, and the MON fuinction lets you hear your processed IF signal so
you can hear the effect of the Tx EQ settings at various levels of clipping.

As always, it is best to record the results and then play back the
recording for critical evaluation so you aren't mixing your biologic
speech monitor with the radio's :-)

73,

Lyle KK7P
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n7ws

Re: RF Speech Processors

In reply to this post by Jim Brown-10

--- On Tue, 1/12/10, Jim Brown <[hidden email]> wrote:
All of which is why we've not heard much about folks trying RF
speech processing. :)

73,

Jim K9YC
I built one years ago, but personally, I'm partial to split-band processing :-)

So were the Kenwood engineers that designed the TS-870, arguably one of the better sounding radios.

Wes N7WS

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Jim Brown-10

Re: RF Speech Processors

On Tue, 12 Jan 2010 21:16:15 -0800 (PST), Wes Stewart wrote:

>I built one years ago, but personally, I'm partial to split-band
>processing :-)

That's the sort of sophisticated broadcast stuff I was referring
to. Not cheap, makes rock and roll radio stations LOUD! The Aphex
Dominator is a (relatively) low cost example.

73,

Jim K9YC

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juergen piezo

Re: RF Speech Processors

In reply to this post by n7ws

Hi Wes

The HIGH BOOST on the TS870S was also very effective. Sometimes the HIGH BOOST would operate and sound like a speech processor with a Heil HC4. A good pileup buster.

Maybe a future firmware revision could add a HIGH BOOST feature.

John

--- On Tue, 1/12/10, Wes Stewart <[hidden email]> wrote:

> From: Wes Stewart <[hidden email]>
> Subject: Re: [Elecraft] RF Speech Processors
> To: "Elecraft List" <[hidden email]>, "Jim Brown" <[hidden email]>
> Date: Tuesday, January 12, 2010, 9:16 PM
> --- On Tue, 1/12/10, Jim Brown <[hidden email]>
> wrote:
> All of which is why we've not heard much about folks
> trying RF
> speech processing. :)
>
> 73,
>
> Jim K9YC
> I built one years ago, but personally, I'm partial to
> split-band processing :-)
>
> So were the Kenwood engineers that designed the TS-870,
> arguably one of the better sounding radios.
>
> Wes N7WS
>
>
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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>
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> Please help support this email list: http://www.qsl.net/donate.html
>

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Doug Turnbull

Re: RF Speech Processors

In reply to this post by KK7P

Dear Lyle and Co,
I hope you do not object to what my asking a question to which I should perhaps know the answer but do not. Just now my K3 is awaiting the DSP mod board which I want to install prior to the second RX and ATU so another rig is being used while the K3 sits on the blocks. In other words it is not convenient to try this for myself just now.

1) Using the DVR can I record my audio post RF clipping.
2) When I use the DVR on the radio for TX audio is this audio used pre or post the RF Clipper and Audio processing.

I suspect it is post processing and applied without any further processing directly to the carrier so that listening to a DVR recording should be representative of what the other guy is hearing. Double processing would be madness. Still I am not certain and so ask these questions.

Appologies if I should know the answer to this question. I do find that the monitor function is less useful because of course one hears one's own voice through the body.

Thank you for your advice.
73 Doug EI2CN

On Tue, 12 Jan 2010 17:59:23 -0800, Lyle Johnson <[hidden email]> wrote:

>
>> I am hoping there is no advantage so I can rid my desk of one more
> little black box. The one thing that I can see on it that would be nice is
> the ability to shift the passband.
>
> In the case of the K3, the Tx EQ can be used to tailor the ultimate
> sound, and the MON fuinction lets you hear your processed IF signal so
> you can hear the effect of the Tx EQ settings at various levels of
> clipping.
>
> As always, it is best to record the results and then play back the
> recording for critical evaluation so you aren't mixing your biologic
> speech monitor with the radio's :-)
>
> 73,
>
> Lyle KK7P
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
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> Please help support this email list: http://www.qsl.net/donate.html

Gary Smith-2

Re: RF Speech Processors

In reply to this post by n7ws

I still have a Vomax Speech Processor I bought new and it was always
stellar. It is a split band processor.

Gary KA1J

> --- On Tue, 1/12/10, Jim Brown <[hidden email]> wrote:
> All of which is why we've not heard much about folks trying RF
> speech processing. :)
>
> 73,
>
> Jim K9YC
> I built one years ago, but personally, I'm partial to split-band processing :-)
>
> So were the Kenwood engineers that designed the TS-870, arguably one of the better sounding radios.
>
> Wes N7WS
>
>
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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>
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>

KK7P

Re: RF Speech Processors

In reply to this post by Doug Turnbull

The DVR records audio before it is "processed" and during playback it i
sinjected at essentially the same place in the audio path so subsequent
processing will be applied.

73,

Lyle KK7P
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