What coax

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KL2LR
Posts: 16
Joined: Fri Dec 11, 2020 9:50 pm
Location: BO37tt

What coax

Post by KL2LR » Fri Dec 11, 2020 9:58 pm

I've looked at this topic and found confusing information on what coax to use. I'll be using a LNA along with the rlt-sdr. The antenna will be an Arrow GP146/440 for now. I'll need 50 feet of coax. This is going to be a portable set up so I can use it at Field Day. I know RG-8 is super but SMA and RG-8 get messy with adapters. :?

VE3EAR
Posts: 49
Joined: Sat Oct 05, 2019 10:13 pm

Re: What coax

Post by VE3EAR » Sat Dec 12, 2020 4:26 pm

For many years now I've been using RG-6 coax for all of my receive antennas, and despite it being 75 ohm, my receivers can't tell the difference! It's cheap, available online from Amazon and others, and adaptors to go from the "F" type connector to others are readily available. I use the "pigtail" type adapters to prevent stressing the SMA connector of the dongle.

73, Bruce, VE3EAR

KL2LR
Posts: 16
Joined: Fri Dec 11, 2020 9:50 pm
Location: BO37tt

Re: What coax

Post by KL2LR » Sat Dec 12, 2020 5:35 pm

:) thank you.

snn47
Posts: 260
Joined: Tue Dec 27, 2016 11:00 pm

Re: What coax

Post by snn47 » Sun Dec 13, 2020 7:03 pm

Some guidance for choosing coax cable here viewtopic.php?f=6&t=4861&p=12432#p12432.

It depends on the max. overall attenuation at 2m/70 cm that you willing to accept. While a LNA will compensate distribution loss, you properbly have to use filter when you have strong transmitter, espceically 2m/70 cm transmitter, close by.

I would use N to SMA adapter, and fix the cable stress free with cable bilder to a piece of glassfiber fishing road and avoid pigtails.

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