[Kenwood] kenwood ts-870

Sun, 19 Jan 2003 07:45:59 -0500

Gents,

I have not had time yet this morning to review it, but I could have sworn
that the 870 manual says that it's noise blanker is designed to work on
pulse type noise and not on continuous power line. Mine, anyway, does not
seem to work at all on "frying" type noise. Not nonsense, just my take on
it.

Best regards, Eric
----- Original Message -----
From: "Dr. Gerald N. Johnson, electrical engineer" <[email protected]>
To: "Eric Lowell" <[email protected]>
Cc: "k0ckdennis" <[email protected]>; <[email protected]>
Sent: Saturday, January 18, 2003 10:51 PM
Subject: Re: [Kenwood] kenwood ts-870

> Eric Lowell wrote:
> >
> > Typical power line noise frequency is too high for a NB circuit to work
on.
>
> NONSENSE!!!
>
> A working NB works super on line noise. Line noise consists of a
> sequence of microsecond long pulses at each line voltage peak. Several
> on each peak. 360 peaks per second on a three phase power line. The
> crystal filters used in all but Tentec radios ring on that noise (as do
> Collins mechanical filters) to fill in the gaps and hide the amplitude
> modulation that should be there. The blanker in my TS-130 takes out line
> noise quite nicely as does the blanker in my Tentec Corsair II. And more
> modern blanker should do at least as fine, perhaps better if not for the
> presence of a strong carrier outside the receiver IF passband but inside
> the noise blanker passband. That is the problem that K0CKD saw.
>
> 73, Jerry, K0CQ
> --
> Entire content copyright Dr. Gerald N. Johnson, electrical engineer.
> Reproduction by permission only.
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