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Author Topic: amplifier? hf/sw improvement need  (Read 1385 times)
MUVR2007
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Posts: 60




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« on: October 23, 2007, 10:54:52 AM »

Hello!
I need some advice from you! The situation is: I have a radio yupiteru mvt 7100 . In this way, I am writting to you to ask what's the best way to get better performance with this radio in HF frequencies (~2Mhz - 20Mhz) in USB mode. I already buyed a coaxial cable and fit it to the antenna jack but that didn't do a significant better job... So, i want to know whta's the best solution for me with no excessive cost of course! My intentions is listening to transatlantic flights over the atlantic!
Hope you can help me!


Many Thanks,


João Fonseca
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KE3WD
Member

Posts: 5688




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« Reply #1 on: October 24, 2007, 09:19:45 AM »

Did you attach an ANTENNA of any kind to the other end of the coax?  

For shortwave listening, a long piece of plain insulated single wire attached to the center of the antenna jack can greatly imporve reception.  

Hanging the longwire antenna outdoors, between insulators, and using the coax to attach can be a very good antenna for shortwave listening.  

Hope this helps,


KE3WD
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MUVR2007
Member

Posts: 60




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« Reply #2 on: October 24, 2007, 09:29:20 AM »

I have already attached the coax cable to the radio and the other terminal to the antenna, by a bnc female connector. The black coax rg-58 is ~5 meters long. Effectively, I can notice a very small improvement when it is connected to the antenna and to the radio but the improvement is, as I said, much small but noticable. Thanks!
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KE3WD
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« Reply #3 on: October 24, 2007, 06:24:19 PM »

What is the antenna?

Type of antenna, size of antenna, height above ground, a description of the antenna itself...
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MUVR2007
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Posts: 60




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« Reply #4 on: October 25, 2007, 03:31:47 AM »

Is a telescopic antenna, ~50cm long,bnc connector, maybe around 20g (weight).
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KE3WD
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Posts: 5688




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« Reply #5 on: October 25, 2007, 10:12:43 AM »

Antenna is not long enough for the Shortwave bands.  


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KI4NX
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Posts: 121




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« Reply #6 on: October 25, 2007, 10:19:17 AM »

Your antenna should be 10 to 20 meters long not 50 cm long. You need more wire outside.
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MUVR2007
Member

Posts: 60




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« Reply #7 on: November 05, 2007, 10:54:16 AM »

With such a long antenna, it won't be the problem of saturation the radio?
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