05/21/2017 17:01

Comparisons

 

On a noisy evening, while listening to a CW Service station on HF, I made these videos.

An EK07/D2 with AGC and set bandwidth 4.0 kHz


Polyphemus 2.0 ...

 

... and again the EK07/D2 without AGC (same bandwidth as above):

>

 

Interesting. Polyphemus does not have any filter: nor in 'IF' circuit (impossible because the Intermediate Frequency is variable between 1.7 up to 3.5 MHz), nor the Audio stage. Even though, its audio response is a bit narrow due to the frequency cut of the loudspeaker.

Its overall performance looks really good (perhaps better in this particular case ...) on a noisy day as compared to an old, but professional and still well performing receiver.


Radioman, May 2017

 

 


Posted by Radioman | Permanent Link