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Radiocommunications

Base Quadband QYT KT7900D low reception

rotceh16

hace 6 años

Hello boys !! I have this QYT KT7900D Quadband Base, which from what I saw on some websites, this equipment is already low reception. And yes, I noticed it compared to other equipment that are located further away and receive well, and I with this equipment more or less, using a calibrated ring antenna and with RG58 cable. The question is: can any electronic device be ground at the reception stage so that it has greater sensitivity? I await your response, thank you very much! atte Hector

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Manuel H. Cortés

537

hace 6 años

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hace 6 años

Hi: the use of the RG58 only works in the HF bands. In the VHF and UHF bands its attenuation is very high and this can cause sensitivity problems in reception. For VHF and UHF bands at least you must use RG (or other cables with specifications higher than RG8. Regards

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rotceh16

hace 6 años

Hello, if you're right in that regard. From what I could read out there, this team has since made a bad reception. Moreover, using the same ringo antenna and RG58 cable with another device (Alinco DR 140) I listen to everything I didn't hear with the other device. The question was if anyone knows this QYT KT7900D (quad-band) equipment, and if any modification can be made electronically to solve the poor reception, I think due to the lack of filters or something. same thanks

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Manuel H. Cortés

537

hace 6 años

Sometimes the circuits that commute the antenna input to the different receivers in that kind of equipment fail, or also in the input of the antenna in reception there are diodes that protect the receiver from extremely high signals and that are short-circuited protecting the equipment . Being short therefore the reception is almost nil.
Another possible failure is that the RF ampilifier transistor is damaged.
You have to be very careful when measuring since many of these components are very sensitive to static electricity discharges that we can have in our dresses.

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