[HBR] Sorry for multiple postings

[Bill Cromwell]

On 05/27/2014 05:35 PM, Ron Barlow via HBR wrote:
> Hi Brian,
>
>   By using a variation on the "regenerodyne" design, one CAN use a selective bandpass filter, in front of the regenerative (2nd) detector.
>
>   This alternate scheme uses a tunable oscillator in the frequency conversion (1st detector) stage. The regenerative 2nd detector stage operates on a fixed frequency.
>
>   AFAIK, the original fixed IF frequency "super gainer" scheme was innovated by Frank Jones, W6AJF, in the 30s. It used regeneration in both the 1st and 2nd detector stages. The 2nd detector was of the autodyne type.
>   
>
Hi,

You have directly touched on the primary distinction between the 'super 
gainer' and the 'regenerodye'. The super gainer type has the VFO out 
front at the converter with fixed frequency regen detector. The 
regenerodyne has the fixed frequncy oscillator at the front end and 
variable frequency regen detector. The primary advantage of the super 
gainer is the possible use of xtal or other filters between the mixer 
and the detector along with a BFO and it's single signal reception. The 
primary advantage of the regenerodyne is the dial reads the same for all 
bands by default - no special effort is required to "track" the dial.

73,

Bill  KU8H