This last Sunday I was a so booored that I had nothing better to do than play with my radios (What else?) so I did a competition among them to find the best performer on shortwave with the help of my trusty digital generator RE 107About the Signal generator SG
RE Radiometer 107 Synthesized Signal Generator
The brand is RE and the model number 107 I don´t know much about it because it was a blind buy from Ebay but it seems to be very accurate like a lab equipment, I don´t know if its output is calibrated or no in dB but it gives readings from a maximum +22.9 to a minimum of -119 dB ?... The RE brand is a little obscure but there are places which sell it, like this http://www.recycledgoods.com/products/R ... rator.html The Test
The test consisted in a 15,600 Khz signal with 10% of modulation of 400 Hz injected directly into the terminal antenna and lowering the signal until my ears can not hear it anymore, in cases where I got weird readings I retested it 1,2,3 times until the readings were consistent. There are some models which I have various samples and I tested all of them to get a better idea of their performance. All of my radios are calibrated to their maximum possible; some have mods to enhance its sensitivity, I added some comments next to the model. The number in the performance column is a negative number as read from the SG, it´s the minimal signal strength detected by the radio and my ears, so the radio that could detect the minimum signal is the most sensitive one and the performance table is ordered to reflect that.
For a webpage with picture links go to this place:
http://www.radiorus.net46.net/HOW%20GOO ... 0IS%20.htm
Brand Model Notes Performance
Sony CRF5100 Earth Orbiter -118
Magnavox 90AL999 aka Philips AL990 -116
Realistic 12-759A Patrolman 9 -111
CCRadioSW CCRadioSW aka Redsun RP2100 -110
Panasonic RF2200 Sample 3 -108
Sony ICF5900 Sample 1 -108
Sony ICF5900 Sample 2 -108
Sony ICF5900 Sample 3 -108
General Electric 7-2990 Made by Panasonic -107
Panasonic RF2900 Modded -106
Sony TFM8000W Super Sensitive -106
Panasonic RF1260 -105
Eton Grundig S350DL aka Tecsun BCL3000 -103
Panasonic RF2200 Sample 2 -103
Zenith D7000Y Transoceanic -103
Panasonic RF1180B Australian Model -100
Panasonic RF2900 Stock -98
Panasonic RF2800 Modded -98
Panasonic RF2600 Modded -98
Panasonic RF1150 -97
Panasonic RF2200 Sample 1, broken ? -94
Grundig 1400SL Could it be broken ? -72Commenting the results
Although the signal was injected directly to the terminal antenna the results are consistent with their performance in the real world, also the frequency was a difficult one had I chosen a lower one all the radios would have performed like super radios, regular shortwave transmission occur at lower freqs like from 6 to 12 khz and are mostly heard in the evenings and nights, those from around 15600 khz and above are heard at midday.
From the result we have some surprises and some deceptions, in the former group we have:
Realistic Patrolman 9 (not all Realistic radios are bad eh ?),
Panasonic RF-1260 (Cheap radio)
And in deception group we have:
Grundig 1400SL (I really like this radio, could it be broken ? It has a great sound ! ),
Panasonic RF-2800 (I did a RF mod to this radio and it´s very sensitive but in frequencies below 12 Khz, I suspect I have a Miller capacitance problem here).
Some guy made a comparison between the transoceanic D7000Y and the Sony CRF-5100 and his conclusion were that his Transoceanic was the best and I was so excited that I bought one too but although my sample is good, it´s no better than my Sony despite of having changed all transistor with newer ones seeking to improve RF performance which I think I´ve achieved but it´s still not in the same league as the Sony, perhaps the sample of this guy it´s not good ? If you have them both please comment about this.Conclusion
Now that you see what a boring day can do, it´s time to enjoy the radios and forget the tests until I get more radios to update this table. Please comment about this work I really like to hear some input from you.
Sorry about my English but it´s the best I can do.Does anybody know how to properly insert a table in this place ?