Recommendations for 800 Mhz cell phone Yagi antenna
 

Folks

So I'm thinking about emergency communications and it seems to me that
an 800 Mhz Yagi antenna would be useful. I have one of those old
Motorola bag phones which I use when travelling in rural Alberta.

It works nice especially when on a 3' mag mount antenna on the vehicle
roof but it seems to me a Yagi up 20' might be useful at times.

Tony

Recommendations for 800 Mhz cell phone Yagi antenna
 

Tony VE6MVP writes:

Folks

So I'm thinking about emergency communications and it seems to me that
an 800 Mhz Yagi antenna would be useful. I have one of those old
Motorola bag phones which I use when travelling in rural Alberta.

It works nice especially when on a 3' mag mount antenna on the vehicle
roof but it seems to me a Yagi up 20' might be useful at times.

Just try it. These things don't cost much, do they? Although you
already have a decent antenna.

Compared to the built-in antenna of a typical cell phone, it will make
a tremendous difference.

Here in Norway we have GSM, 900 MHz in rural areas. The signal is very
poor at our summer house. So we bought a 40$ 9 el. Yagi at a hardware
store and put it in a tree, may be 15 ft up. It's supposed to have 10
dB gain, but it comes with 33 ft of RG-58, so we lose more than half
the gain on the way. However, the built-in antenna of most cell phones
is unbelievably bad, and getting the antenna higher up makes a
lot of difference at our location. I went from 0 bars to 5.

The coax is marked "low loss" with nice, friendly letters. I guess
that's what does the trick :-)

73
Jon

Recommendations for 800 Mhz cell phone Yagi antenna
 

Jon, just think of how many bars you would have had the cable been
marked ULTRA LOW LOSS...
denny / k8do

Recommendations for 800 Mhz cell phone Yagi antenna
 

Tony, look in the ARRL Antenna Handbook... There will be short yagi
designs for UHF... A Quagi would work well and be easy to match, but
not as handy to stow away...I suggest 5 elements as the most bang for
the buck between complexity and performance... Just scale to your
frequency... Use a small aluminum tube for the boom, and bare welding
rods for the elements... Put a decent piece of RG8 or LMR400 on it and
it should play well...

denny / k8do

Tony VE6MVP wrote:
Folks

So I'm thinking about emergency communications and it seems to me that
an 800 Mhz Yagi antenna would be useful. I have one of those old
Motorola bag phones which I use when travelling in rural Alberta.

It works nice especially when on a 3' mag mount antenna on the vehicle
roof but it seems to me a Yagi up 20' might be useful at times.

Tony

Recommendations for 800 Mhz cell phone Yagi antenna
 

Is there an easy way of coupling the phone to the coax?

Alan
WN4HOG

--
Windsurfing Club: http://www.ibscc.org


"Denny" wrote in message
oups.com...
Tony, look in the ARRL Antenna Handbook... There will be short yagi
designs for UHF... A Quagi would work well and be easy to match, but
not as handy to stow away...I suggest 5 elements as the most bang for
the buck between complexity and performance... Just scale to your
frequency... Use a small aluminum tube for the boom, and bare welding
rods for the elements... Put a decent piece of RG8 or LMR400 on it and
it should play well...

denny / k8do

Tony VE6MVP wrote:
Folks

So I'm thinking about emergency communications and it seems to me that
an 800 Mhz Yagi antenna would be useful. I have one of those old
Motorola bag phones which I use when travelling in rural Alberta.

It works nice especially when on a 3' mag mount antenna on the vehicle
roof but it seems to me a Yagi up 20' might be useful at times.

Tony

Recommendations for 800 Mhz cell phone Yagi antenna
 

On 07 Nov 2006 11:22:53 +0100, LA4RT Jon wrote:

The coax is marked "low loss" with nice, friendly letters. I guess
that's what does the trick :-)

chuckle

Tony

Recommendations for 800 Mhz cell phone Yagi antenna
 

On 7 Nov 2006 04:31:37 -0800, "Denny" wrote:

Tony, look in the ARRL Antenna Handbook...

Interesting idea. I just received the 16th ediition which I got from
someone on Ebay. I

Put a decent piece of RG8 or LMR400 on it and
it should play well...

That LMR400 is fairly stiff stuff. The biggest problem would be
locating the end that fits on the Motorala bag phone especially with
LMR 400.

I have no idea what kind of end it is but I'm sure a commercial radio
shop can tell me.

Tony

Recommendations for 800 Mhz cell phone Yagi antenna
 

In article ,
Tony VE6MVP wrote:

Folks

So I'm thinking about emergency communications and it seems to me that
an 800 Mhz Yagi antenna would be useful. I have one of those old
Motorola bag phones which I use when travelling in rural Alberta.

It works nice especially when on a 3' mag mount antenna on the vehicle
roof but it seems to me a Yagi up 20' might be useful at times.

Tony

Here in the USA, we are losing our AMPS Network next year, so all the
3Watt AMPS BagPhones will be non-functional. Most of us bush Folks have
switched to either Digital BagPhones, or handhelds with external Antenna
Ports and 3 Watt Booster Amps. I use a Nokia Handheld with external
10db Panel Antenna, mounted in an Active Cradle that simulates an RJ11
Jack, and has a Cordless Phone plugged into it. I have a "Line of Sight"
shot at our local Cellsite, which is 16 miles away, (over water) so I
don't need the Booster Amp here. Some of the neighbors need them,
however.

Bruce in alaska AL7AQ
--
add a 2 before @

Recommendations for 800 Mhz cell phone Yagi antenna
 

"Alan" wrote in message
m...
Is there an easy way of coupling the phone to the coax?

I have observed that two of my family's (various) phones have concealed coax
fittings. Look for any bit of peelable/liftable plastic trim on or near the
top of the phone that might be covering such a jack.

Dunno what the connector series would be -- there are more different kinds
than I can name by eye.

I think I may have observed a coax fitting on the base of one phone. This
would be for a unified vehicle adapter, where you slap the phone into a
cradle and get power, RF and audio all at once.

I hope this helps.

Recommendations for 800 Mhz cell phone Yagi antenna
 

Get LMR-400 Ultraflex. Much more flexible.
Adaptor cords are available for most any phone from various suppliers.
Try google on "cell phone antenna cord"

Bob



In article ,
Tony VE6MVP wrote:

On 7 Nov 2006 04:31:37 -0800, "Denny" wrote:

Tony, look in the ARRL Antenna Handbook...

Interesting idea. I just received the 16th ediition which I got from
someone on Ebay. I

Put a decent piece of RG8 or LMR400 on it and
it should play well...

That LMR400 is fairly stiff stuff. The biggest problem would be
locating the end that fits on the Motorala bag phone especially with
LMR 400.

I have no idea what kind of end it is but I'm sure a commercial radio
shop can tell me.

Tony

Recommendations for 800 Mhz cell phone Yagi antenna
 

On Tue, 07 Nov 2006 23:06:11 GMT, Bruce in Alaska
wrote:

Here in the USA, we are losing our AMPS Network next year, so all the
3Watt AMPS BagPhones will be non-functional. Most of us bush Folks have
switched to either Digital BagPhones, or handhelds with external Antenna
Ports and 3 Watt Booster Amps. I use a Nokia Handheld with external
10db Panel Antenna, mounted in an Active Cradle that simulates an RJ11
Jack, and has a Cordless Phone plugged into it. I have a "Line of Sight"
shot at our local Cellsite, which is 16 miles away, (over water) so I
don't need the Booster Amp here. Some of the neighbors need them,
however.

Ah, very interesting. To my knowledge we're not losing ours in
Canada any time soon.

But I also have two cell phones. The small tri band pocket phone and
the bag phone. I've been wondering if I wouldn't be best off figuring
out a good system of using the pocket phone with an external antenna
and only pay for one cell phone.

But also my pocket cell phone is about four years old now. And I
don't want to get stuck with some technology which requires a specific
make and model of cell phone.

Tony

Recommendations for 800 Mhz cell phone Yagi antenna
 

On Wed, 08 Nov 2006 13:21:12 -0500, Bob Dixon wrote:

Get LMR-400 Ultraflex. Much more flexible.

Good point. I've heard of that stuff in the past but had forgotten
about it.

Adaptor cords are available for most any phone from various suppliers.
Try google on "cell phone antenna cord"

Thanks, Tony

Recommendations for 800 Mhz cell phone Yagi antenna
 

You'll need very low loss feedline, something along the lines of LDF4 heliax
to take full advantage of it. So, that means working with "N" connectors
until just before it goes into the bag phone. Fortunately for you there's s
glut of that stuff on ebay from all the upgrades cell phone carriers are
doing.

Also, make sure that the phone you're relying on will be served for years to
come. Analog service is under review for possible turndown here in the US by
2008 or so.

You might consider backing a couple of spare 12v batteries (or whatever size
it requires) to ensure an adequate supply of power.

The whole point of the yagi is a directional antenna, so it will be best
suited for stationary applications.

"Tony VE6MVP" wrote in message
...
Folks

So I'm thinking about emergency communications and it seems to me that
an 800 Mhz Yagi antenna would be useful. I have one of those old
Motorola bag phones which I use when travelling in rural Alberta.

It works nice especially when on a 3' mag mount antenna on the vehicle
roof but it seems to me a Yagi up 20' might be useful at times.

Tony

Recommendations for 800 Mhz cell phone Yagi antenna
 

"dave" wrote in message
news:C9e6h.4453$T_.3023@trndny06...
Analog service is under review for possible turndown here in the US by 2008
or so.

You aren't serious! Surely you don't still have analogue phones in America?
How backwards!

Bill

Recommendations for 800 Mhz cell phone Yagi antenna
 

On Thu, 16 Nov 2006 01:46:36 -0000, "Bill Wright"
wrote:

You aren't serious! Surely you don't still have analogue phones in America?

And no general access to fiber optics (we still have to use copper).

How backwards!

Yeah, but we kicked out the right-wing socialists who were strangling
business opportunity and growth.