[Boatanchors] National one ninety receiver

[Singley, Rodger]

Mike,

In my opinion, the tuning dial mechanism is much nicer on the NC-270 and it has a notch filter.  Also, you don't have to use the calibrator to set the band spread dial when changing bands like you do with the NC-190.  But SSB and CW performance is much smoother on the NC-190.

It just seems like a strange design choice given that the NC-270 with its ham orientation has a less desirable detector/agc setup.  The NC-270 was introduced in 1960, a year earlier than the NC-190 but the much earlier NC-300/303 receivers were setup with operable AGC in the non-AM modes.  Carl KM1H might chime in later with some rationale why National made these design choices since he was there during this era.

Rodger WQ9E


-----Original Message-----
From: boatanchors-bounces at mailman.qth.net on behalf of mikea
Sent: Tue 9/28/2010 10:17 AM
To: boatanchor network
Subject: Re: [Boatanchors] National one ninety receiver
 
On Mon, Sep 27, 2010 at 08:04:52PM -0500, Singley, Rodger wrote:
> Glen,
> 
> The odd part to me is the general coverage NC-190 has a separate
> product detector and allows AGC usage on all modes. The "better"
> NC-270 uses the final IF amp as a product detector for SSB/CW and
> disables AGC on these modes. I acquired my NC-190 first and I was
> surprised when I started using the NC-270 on SSB with a CE-20A
> multi-mode phasing exciter.

Surprised how, OM? Which RX did you prefer, and why?

-- 
Mike Andrews, W5EGO
mikea at mikea.ath.cx
Tired old sysadmin 
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