Re: LF: MFJ259B

["Alan Melia" <alan.melia@btinternet.com>]

Just a thought you could use the divide chip as a DAC  and generate a
stepwise sinewave and then filter ??

Alan G3NYK

----- Original Message -----
From: "John Andrews" <w1tag@w1tag.com>
To: <rsgb_lf_group@blacksheep.org>
Sent: Wednesday, October 17, 2007 7:24 PM
Subject: Re: LF: MFJ259B


> Mal,
>
> The harmonic content of a divider's rectangular waveform would be a
> problem for the wideband detector circuitry in the analyzer. The
> waveform is typically not an issue for a classic bridge with a receiver
> for a detector, as the harmonics are ignored.
>
> If you could incorporate a good low pass filter to take out the third
> harmonic and above, then your idea should work.
>
> John A.
>
> hamilton mal wrote:
> > Tnx Warren for the prompt reply and also all the others that responded,
much
> > appreciated.
> > One approach that I had in mind was an outboard bit of hardware like a
> > divider that fed the ant socket of the mfj 259 b and for instance use
the
> > 4 - 10  mhz range, divide by 10 to give 400 - 1000 khz (500 khz band).
Has
> > anyone seen a cct along these lines.
>