[Boatanchors] National one ninety receiver

[Carl]

The only 270 rationale Im aware of was a quick and dirty response to the 
Drake 2A/2B. None are on my want list. I suspect they were gun shy about a 
ham band only set after the 303.

The 190 is an upgrade of the 109 which isnt a bad radio. I havent touched a 
190 for 30-40 years but was an OK SWL mid level ham set.

Carl
KM1H




>
> 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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