[amsat-bb] Re: Best type of coax to use between preamps and antennas

[hasan schiers]

As Dom noted in another post, any loss ahead of the preamp detracts from 
the NF of the preamp (which you paid good money to get as low as 
possible). Throwing that away by using small/cheap cable is not a wise 
investment when relatively inexpensive low loss (preserving the NF) 
cables are readily available. If you plug  the losses of a 15 ft run of 
smaller coax into a link budget calculator (referenced in this forum 
many times), you will be astounded at how much your sensitivity drops by 
placing these kinds of losses ahead of a 0.2 or 0.5 dB NF preamp.

...hasan, N0AN

Joe wrote:
> Thing is with that short of a run,
> any of the smaller coaxes will work just fine and he'd never know the 
> difference  10 to 15 feet  anything will work!
>
> hasan schiers wrote:
>
>> LMR-400 works very well, and for higher flexibility requirements, you 
>> can use LMR-400 ultra flex.
>> It's loss is very close to 9913, without some of the 9913 varieties 
>> problems. I replaced all my 9913 with LMR-400 years ago, and all my 
>> water problems went away, never to return.
>>
>> 73,
>>
>> hasan, N0AN
>>
>> Ronald Nutter wrote:
>>
>>> After problems I had on Field Day in trying to operate the 
>>> satellites, I am looking to upgrade the coax I use between the 
>>> preamps and the antennas.  I am using 9913FX from the IC-910H and 
>>> the preamps.  I had been using RG Mini 8/U for the connection 
>>> between the preamps and antennas.  Should I also use 9913FX between 
>>> the preamps and the antennas?  The run between the radio and the 
>>> preamp is 50 ft.  The run from the preamp to the antennas is about 
>>> 10 - 15 ft depending on where I set the antennas up.  I am concerned 
>>> about how flexible the 9913FX would be in terms of the antennas 
>>> rotating back and forth.  I was planning on ordering the cables 
>>> pre-made from CableXperts since working with N connectors isnt my 
>>> strong point and dont want to worry about my soldering and having a 
>>> good connection on both ends of the cable.
>>>
>>> Any suggestions appreciated.
>>>
>>> Thanks,
>>> Ron
>>> KA4KYI
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