Cross-test between two radios

 

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Cross-test between two radios

These days i read on a post in youtube someone posting a video with two radios connected in the same antenna which i think is rather wrong 

Here i will show my idea on how two radios can be tested with better and more 'accurate' way based on my personal ideas of the past that are also referred in other posts in this webpage

At first is better to use diversity as it is called out doors and not connecting the radio in your antenna system. The reason is simple: not only  system Noise is passed through the antenna but also the antenna offers  much higher signal than radios require to be tested in poor signals

we need as low as possible signals to really have the correct results

The idea is very simple.

2-First take  the radios outdoors as i did below. A refurbished 1103 and a PL380

(article was written on 2-10/20 BTW )

The best way is to span the radios with a longer distance each other for better results aroind 1-2 m far and it them make a equal distant triangle  or even be in exactly the middle

3-Tune both radios in the same frequency and adjust volume to be the same Then adjust the pass band filters to be nearly the same.

4-Re-tune the first radio to a poor signal and then tune the second

5-Rest in between and  listen taking notes

6-if you want to listen to another frequency do the same process 3-5 as far as necessary >Don forget that every radio has different sensitivity in different band 

This is the process suggested for  the best results in sensitivity

For even better results i propose the usage with  two in-earphones to avoid  ambient noise and possibly of the same model and company in order to have the sound quality -fidelity

BY chance i had two Sennheiser in-ears of the same model form the past that are used only in special cases. As they are ear specific thus i separated from the remain system and then put into my ears as show in the photo above A possible change of the volume would be required before making the diversity/cross-test

The more sensitive radio will show traces of signal when the other wold receive only noise

In the above example i did in only one station having slightly the same results

As for reception on MW the things is nearly the same The one is simply putting the one radio over the other in totally parallel  and test as in this photo using the earphone diversity method:

Because one of these radios van interfere from its LCD screen i propose using a carton box in between. This cannot solve the LCD noise but at such small distance the noise vanishes!

Tηε process is very simple: You jut tune to the station and then rotate both radios until the signal vanishes or zeroes out. Then you rotate back the radios checking which of the two starts producing the faintest signal. If the radios have SSB capablity it is better to check which if them produces first traces of exalted signal carrier.

Hope that this idea may help . If  there is anyone commenting pro or against this idea please let me know below!