Re: [Discuss-gnuradio] Moving my antenna

[david vanhorn]

It would be very helpful to know the main frequency of interest.
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Re: [Discuss-gnuradio] Moving my antenna

[Doug]

On 01/29/2019 03:16 PM, Albin Stigö wrote:

Loss will be proportional to the length of coax, type of coax,
impedenace match and frequency. Higher frequency, higher loss. For
example at 10MHz the loss in in 100m RG58 would be around 3.7dB, at
1000MHz 48dB, a factor 27000 difference.

It's normally best practice to put the receiver/transmitter as close
to the antenna as possible.


--Albin


That's quite true, however the higher and more in the clear outdoors you
can put it will improve the signal considerably. For coax, you should
use a 50 ohm cable, preferably the Times Microwave

types LMR-240 or, better, LMR-400. You can look up the specs on these
cables on the Internet and calculate cable loss versus length from the
information found there. You will need to adapt the

cable connectors to the small ones on your radio. Commercial adapters
are available for all combinations of interface. I suggest terminating
either of the cables I recommend in type N male.

Doug, WA2SAY, retired RF Engineer


On Tue, Jan 29, 2019, 21:07 Tarquin mailto:tarquin.ro...@gmail.com> wrote:

Hi

If you want to go "cheap" use coax intended for satellite TV
reception. Be carefull about 75ohm, as the Hack RF is a 50 ohm
system, you can use RG58U not to costly, don't expect good
performance above 1.2 GHz. Not sure what you want to intercept, if
it VHF UHF you will be ok, else you could try RG213 but that ½
inch thich and you will have to adapt.

The thinner coax RG179 /178 will be fairly lossy.

I suggest personaly start with RG58 its cost effective and maybe
an LNA near the antenna

Regards

Zr1tR

*From:*Discuss-gnuradio
[mailto:discuss-gnuradio-bounces+tarquin.roode
=gmail@gnu.org 
]
*On Behalf Of *david vanhorn
*Sent:* Tuesday, January 29, 2019 9:52 PM
*To:* cliff palmer
*Cc:* Discuss-gnuradio@gnu.org 
*Subject:* Re: [Discuss-gnuradio] Moving my antenna

Coax loss can be a big issue.

Given the low power levels you will suffer less loss on a long run
using 75 ohm coax cable which is designed for low loss, even
assuming you do nothing about the mismatch at the ends of the
run.  All that is good up to about 1ghz where more specialized
coax is needed for minimum loss.

The antenna is a significant part of the equation and you are well
advised to use an antenna suited for the frequency of interest.
Broadband antennas like discones have very low gain, and they pull
in other strong signals you don't want.

On Tue, Jan 29, 2019, 12:40 PM cliff palmer mailto:palmercl...@gmail.com> wrote:

I have a HackrfOne with an Ant500 antenna connected to my
workstation in my basement (where the internet connection
lives).  I need to move the antenna out of the basement to
improve reception, so I thought I would use coax to connect
the antenna from upstairs to the HackrfOne.

I'm too new to SDR to be confident about just moving the
antenna and using a spare length of cable coax.  Please
provide some help on selecting, sizing and connecting coax
between the HackrfOne and the Ant500.

Thanks

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Re: [Discuss-gnuradio] Moving my antenna

[Chris Kuethe]

I bought a bag of bias tees on ebay and use them to power some LNAs hanging
out near the antennas. I've got 30-50ft of coax and some bandpass filters
between the antenna and my receivers...

https://smile.amazon.com/gp/product/B0771PL6ZS  (LNA)
https://www.ebay.com/itm/RF-Divider-Biaser-Bias-Tee-10MHz-6GHz-HAM-radio-RTL-SDR-LNA-Amplifier-/263842902492

On Tue, Jan 29, 2019 at 12:07 PM Tarquin  wrote:

> Hi
>
>
>
> If you want to go “cheap” use coax intended for satellite TV reception. Be
> carefull about 75ohm, as the Hack RF is a 50 ohm system, you can use RG58U
> not to costly, don’t expect good performance above 1.2 GHz. Not sure what
> you want to intercept, if it VHF UHF you will be ok, else you could try
> RG213 but that ½ inch thich and you will have to adapt.
>
>
>
> The thinner coax RG179 /178 will be fairly lossy.
>
>
>
> I suggest personaly start with RG58 its cost effective and maybe an LNA
> near the antenna
>
>
>
> Regards
>
>
>
> Zr1tR
>
>
>
> *From:* Discuss-gnuradio [mailto:discuss-gnuradio-bounces+tarquin.roode=
> gmail@gnu.org] *On Behalf Of *david vanhorn
> *Sent:* Tuesday, January 29, 2019 9:52 PM
> *To:* cliff palmer
> *Cc:* Discuss-gnuradio@gnu.org
> *Subject:* Re: [Discuss-gnuradio] Moving my antenna
>
>
>
> Coax loss can be a big issue.
>
> Given the low power levels you will suffer less loss on a long run using
> 75 ohm coax cable which is designed for low loss, even assuming you do
> nothing about the mismatch at the ends of the run.  All that is good up to
> about 1ghz where more specialized coax is needed for minimum loss.
>
>
>
> The antenna is a significant part of the equation and you are well advised
> to use an antenna suited for the frequency of interest. Broadband antennas
> like discones have very low gain, and they pull in other strong signals you
> don't want.
>
>
>
> On Tue, Jan 29, 2019, 12:40 PM cliff palmer 
> I have a HackrfOne with an Ant500 antenna connected to my workstation in
> my basement (where the internet connection lives).  I need to move the
> antenna out of the basement to improve reception, so I thought I would use
> coax to connect the antenna from upstairs to the HackrfOne.
>
> I'm too new to SDR to be confident about just moving the antenna and using
> a spare length of cable coax.  Please provide some help on selecting,
> sizing and connecting coax between the HackrfOne and the Ant500.
>
> Thanks
>
>
>
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> www.avg.com
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Re: [Discuss-gnuradio] Moving my antenna

[Albin Stigö]

Loss will be proportional to the length of coax, type of coax, impedenace
match and frequency. Higher frequency, higher loss. For example at 10MHz
the loss in in 100m RG58 would be around 3.7dB, at 1000MHz 48dB, a factor
27000 difference.

It's normally best practice to put the receiver/transmitter as close to the
antenna as possible.


--Albin

On Tue, Jan 29, 2019, 21:07 Tarquin  Hi
>
>
>
> If you want to go “cheap” use coax intended for satellite TV reception. Be
> carefull about 75ohm, as the Hack RF is a 50 ohm system, you can use RG58U
> not to costly, don’t expect good performance above 1.2 GHz. Not sure what
> you want to intercept, if it VHF UHF you will be ok, else you could try
> RG213 but that ½ inch thich and you will have to adapt.
>
>
>
> The thinner coax RG179 /178 will be fairly lossy.
>
>
>
> I suggest personaly start with RG58 its cost effective and maybe an LNA
> near the antenna
>
>
>
> Regards
>
>
>
> Zr1tR
>
>
>
> *From:* Discuss-gnuradio [mailto:discuss-gnuradio-bounces+tarquin.roode=
> gmail@gnu.org] *On Behalf Of *david vanhorn
> *Sent:* Tuesday, January 29, 2019 9:52 PM
> *To:* cliff palmer
> *Cc:* Discuss-gnuradio@gnu.org
> *Subject:* Re: [Discuss-gnuradio] Moving my antenna
>
>
>
> Coax loss can be a big issue.
>
> Given the low power levels you will suffer less loss on a long run using
> 75 ohm coax cable which is designed for low loss, even assuming you do
> nothing about the mismatch at the ends of the run.  All that is good up to
> about 1ghz where more specialized coax is needed for minimum loss.
>
>
>
> The antenna is a significant part of the equation and you are well advised
> to use an antenna suited for the frequency of interest. Broadband antennas
> like discones have very low gain, and they pull in other strong signals you
> don't want.
>
>
>
> On Tue, Jan 29, 2019, 12:40 PM cliff palmer 
> I have a HackrfOne with an Ant500 antenna connected to my workstation in
> my basement (where the internet connection lives).  I need to move the
> antenna out of the basement to improve reception, so I thought I would use
> coax to connect the antenna from upstairs to the HackrfOne.
>
> I'm too new to SDR to be confident about just moving the antenna and using
> a spare length of cable coax.  Please provide some help on selecting,
> sizing and connecting coax between the HackrfOne and the Ant500.
>
> Thanks
>
>
>
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> www.avg.com
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Re: [Discuss-gnuradio] Moving my antenna

[Sid Boyce]

The ANT500 needs 50 Ohm coax - RG8, RG13, etc.
73 ... Sid.

On 29/01/2019 19:51, david vanhorn wrote:

Coax loss can be a big issue.
Given the low power levels you will suffer less loss on a long run 
using 75 ohm coax cable which is designed for low loss, even assuming 
you do nothing about the mismatch at the ends of the run.  All that 
is good up to about 1ghz where more specialized coax is needed for 
minimum loss.


The antenna is a significant part of the equation and you are well 
advised to use an antenna suited for the frequency of interest. 
Broadband antennas like discones have very low gain, and they pull in 
other strong signals you don't want.


On Tue, Jan 29, 2019, 12:40 PM cliff palmer  wrote:


I have a HackrfOne with an Ant500 antenna connected to my
workstation in my basement (where the internet connection
lives).  I need to move the antenna out of the basement to
improve reception, so I thought I would use coax to connect the
antenna from upstairs to the HackrfOne.
I'm too new to SDR to be confident about just moving the antenna
and using a spare length of cable coax. Please provide some help
on selecting, sizing and connecting coax between the HackrfOne and
the Ant500.
Thanks

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Senior Staff Specialist, Cricket Coach
Microsoft Windows Free Zone - Linux used for all Computing Tasks


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Re: [Discuss-gnuradio] Moving my antenna

[Tarquin]

Hi



If you want to go “cheap” use coax intended for satellite TV reception. Be 
carefull about 75ohm, as the Hack RF is a 50 ohm system, you can use RG58U not 
to costly, don’t expect good performance above 1.2 GHz. Not sure what you want 
to intercept, if it VHF UHF you will be ok, else you could try RG213 but that ½ 
inch thich and you will have to adapt.



The thinner coax RG179 /178 will be fairly lossy.



I suggest personaly start with RG58 its cost effective and maybe an LNA near 
the antenna



Regards



Zr1tR



From: Discuss-gnuradio 
[mailto:discuss-gnuradio-bounces+tarquin.roode=gmail@gnu.org] On Behalf Of 
david vanhorn
Sent: Tuesday, January 29, 2019 9:52 PM
To: cliff palmer
Cc: Discuss-gnuradio@gnu.org
Subject: Re: [Discuss-gnuradio] Moving my antenna



Coax loss can be a big issue.

Given the low power levels you will suffer less loss on a long run using 75 ohm 
coax cable which is designed for low loss, even assuming you do nothing about 
the mismatch at the ends of the run.  All that is good up to about 1ghz where 
more specialized coax is needed for minimum loss.



The antenna is a significant part of the equation and you are well advised to 
use an antenna suited for the frequency of interest. Broadband antennas like 
discones have very low gain, and they pull in other strong signals you don't 
want.



On Tue, Jan 29, 2019, 12:40 PM cliff palmer https://lists.gnu.org/mailman/listinfo/discuss-gnuradio



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Re: [Discuss-gnuradio] Moving my antenna

[david vanhorn]

Coax loss can be a big issue.
Given the low power levels you will suffer less loss on a long run using 75
ohm coax cable which is designed for low loss, even assuming you do nothing
about the mismatch at the ends of the run.  All that is good up to about
1ghz where more specialized coax is needed for minimum loss.

The antenna is a significant part of the equation and you are well advised
to use an antenna suited for the frequency of interest. Broadband antennas
like discones have very low gain, and they pull in other strong signals you
don't want.

On Tue, Jan 29, 2019, 12:40 PM cliff palmer  I have a HackrfOne with an Ant500 antenna connected to my workstation in
> my basement (where the internet connection lives).  I need to move the
> antenna out of the basement to improve reception, so I thought I would use
> coax to connect the antenna from upstairs to the HackrfOne.
> I'm too new to SDR to be confident about just moving the antenna and using
> a spare length of cable coax.  Please provide some help on selecting,
> sizing and connecting coax between the HackrfOne and the Ant500.
> Thanks
>
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[Discuss-gnuradio] Moving my antenna

[cliff palmer]

I have a HackrfOne with an Ant500 antenna connected to my workstation in my
basement (where the internet connection lives).  I need to move the antenna
out of the basement to improve reception, so I thought I would use coax to
connect the antenna from upstairs to the HackrfOne.
I'm too new to SDR to be confident about just moving the antenna and using
a spare length of cable coax.  Please provide some help on selecting,
sizing and connecting coax between the HackrfOne and the Ant500.
Thanks
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