[Kenwood] How to reduce the TS850 "hiss"?
Rick Wells (W2RW)
[email protected]
Sun, 9 Jun 2002 09:58:23 -0400
Only this hiss in headphones is bothersome to me. I cured that by soldering
a small tantalum cap (can't remember the value, maybe 5-10uf) right inside
the phone jack.
73,
Rick
----- Original Message -----
From: "Guido Tedeschi, ik2bcp" <[email protected]>
To: <[email protected]>
Sent: Saturday, June 08, 2002 6:44 PM
Subject: [Kenwood] How to reduce the TS850 "hiss"?
> Hello from Italy,
>> I'm very satisfied of my TS850S that I bought used two years ago and I
> believe that it is still the best bargain radio on the used market.
>> After some mods like separate RX antenna using the DSP connectors (no
extra
> holes...) and the NB without the capacitors (good improvement) and after
> adding a RS232C interface
> (http://www.hamlan.org/tech/kenwood232/knw232.htm), now I'm searching some
> other mods to improve this great radio.
>> One thing to improve is the "hiss" in the receiver: the 850 receive very
> well, but the RF/IF and audio "hiss" are very annoying...
>> My next mod will be the substitution of the audio PA with a TDA2003 IC:
this
> is a lower noise IC pin to pin compatible with the original uPC2002
> (TDA2002) and I think that this will reduce a lot the audio "hiss".
>> The most important goal would be the reduction of the RF/IF "hiss" but it
is
> a hard task to find which stages are the noisy ones in the RF/IF chain...
>> Has anyone already done this job and discovered a solution?
>> In my radio (and also another one), I found that excluding the preamps
with
> AIP button reduces a lot the noise, do you think that it would be useful
the
> substitution of the original preamps (mosfet for 10m and parallel of fets
> for the other bands) with some kind of low noise and high dynamic range
> preamps?
>> Thanks, best 73 and ciao
>> Guido, ik2bcp / ab9dg
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