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Author Topic: external dsp  (Read 694 times)
KB7AA
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Posts: 26




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« on: March 29, 2019, 03:19:34 PM »

Hi...not sure if this belongs on this thread, but not a query regarding digital modes themselves. I have a TS850sat, as a backup station. Love it, works well w/ excellent notch that I wish was on my more modern Icoms. So, queastion. Kenwood makes an external DSP unit that can make receive sigs and your xmit signals digital, I believe. This dsp device still sells used for abt $400. My question, how is this so much better than some of the devices out there, like perhaps a Clear Speech spkr, or others, that are far cheaper, even new? I dont have the Kenwood unit, and dont intend to add it, especially at current used prices. But just curious as to the above comparison, if anyone has a thought...am all ears! Tnx es 73, Jerry KB7AA
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G3RZP
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Posts: 1319




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« Reply #1 on: March 29, 2019, 04:40:47 PM »

I have a very old (I guess at least 15 if not 20 years) 'Timewave' DSP 9 AF DSP unit. On SSB, it can be very useful: I find on CW, it is  less so. Got it used from an SK, so it doesn't owe me anything but I wouldn't go over board about it. It has the same problems all audio DSPs do - inadequacies in the rx chain prior to the DSP are hard to deal with.

There are horrific stories of fully DSP professional HF receivers that worked well in the lab and collapsed completely on an antenna...

I am however an RF engineer. So digital people are 'Bit Freaks'.
How do Bit Freaks address an  'RF engineer?'

'Sir!'

Only the XYL is a 'bit freak' and doesn't accept that.....
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KB7AA
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Posts: 26




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« Reply #2 on: March 29, 2019, 07:31:25 PM »

tnx for reply from across the pond, as I was originally. Am a brummy, from Birmingham...dont hold that against me, mate:)Smiley

Actually, I am trying to figure out if the TS850 DSP unit works thru the IF, and the other units out there, thruaudio DSP mainly??  Any help grateful. PS-I am not an engineer in any realm...TNX!
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VE7DQ
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Posts: 270




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« Reply #3 on: March 29, 2019, 09:43:11 PM »

Most of my operating is fairly casual, mostly SSB with some CW, both on 80M and 40M.  I acquired another (working) DSP-100 recently and attached it to the least-optioned TS-850 I own.  About all I can say about it is that the transmit audio bandwidth seems to be a bit wider and perhaps cleaner than with the DSP offline, and in receive mode, there may some reduction in background noise and a reduction in the low-frequency audio spectrum, but it's slight.  I may not be using it to its full potential as I have not tried it with narrow filters in either SSB or CW receive mode.  At this time it seems more like a golly-gee-whiz-you-have-one kinda box.

I believe that the DSP-100 was Kenwood's first tentative foray into the amateur radio DSP realm, although they do reference a DSP-10 in the service manual.

Verbatim from said manual, its main function is digital signal processing for:
SSB modulation
CW
AM
FSK modulation
Carrier generation during frequency modulation (and SSB?)
PSN detection and audio-frequency low-pass filtering
DSB detection and audio-frequency low-pass filtering.

Simply described, the DSP-100 works at 36.891 kHz to do its processing.

I've seen some impressive videos on the University of Youtube using the BHI audio-based noise reduction modules from Jolly Old England in a TS-850;  almost impressive enough for me to commit a purchase for trial purposes!

You know what an engineer is?  He's someone that knows more and more about less and less until he knows absolutely everything about nothing.

A technician, on the other hand,  is someone that knows less and less about more and more until he knows absolutely nothing about everything!

I fail in the latter category!   Huh Grin

Cheers!
Tom
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WB8VLC
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Posts: 667




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« Reply #4 on: March 29, 2019, 10:12:41 PM »

Not as expensive as BHI.

https://www.elekitsorparts.com/?product=external-audio-dsp-filter-module-for-ssb-cw-ft8x7-dsp-filter

https://www.youtube.com/watch?v=pnBD4ZJuZhY
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SA4MDN
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Posts: 100




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« Reply #5 on: March 30, 2019, 06:45:26 AM »

in use BHI products on my TS830s, FT 817ND and FT101E, cant fault them, well worth it for me.
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KB7AA
Member

Posts: 26




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« Reply #6 on: March 30, 2019, 04:30:54 PM »

All input above very helpful. Pretty much confirms my thoughts about not needing a Kenwd DSP unit...for $400 or so. Will look into the other suggestions...mny tnx to all...73, KB7AA
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