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Author Topic: FT-991A Short apartment antenna for 40m?  (Read 653 times)
KE7KXS
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Posts: 16




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« on: November 10, 2017, 10:36:56 AM »

Hi,

I just got my radio and can get on local 144/440 FM repeaters just fine.

I'm wanting to try SSB, but it appears my home built stick antenna might not emit well.

I can't really afford to buy a nifty antenna, and the space is very limited as I'm on a 3rd story apartment. No railing or balcony.

Could you suggest a home brew antenna I could use?

Also, what is the best way to test that my RF reaches out?

Thank you, Caesar.
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WW7KE
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Posts: 576




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« Reply #1 on: November 10, 2017, 10:45:12 AM »

Hi,

I just got my radio and can get on local 144/440 FM repeaters just fine.

I'm wanting to try SSB, but it appears my home built stick antenna might not emit well.

I can't really afford to buy a nifty antenna, and the space is very limited as I'm on a 3rd story apartment. No railing or balcony.

Could you suggest a home brew antenna I could use?

What kind of construction is your apartment building?  If it's wood-frame with no stucco, you might get away with an indoor dipole or loop strung around the ceiling, fed with ladder line.  I've used those in frame apartment buildings with success.

If you're in a steel-and-concrete or stucco-encrusted building, it'll be much more difficult to get out with an indoor antenna.  I'd use low power (50 watts or less) in any case, especially if you're not on the top floor.

Quote
Also, what is the best way to test that my RF reaches out?

Listening on an internet remote receiver, or making local QSOs first, would be a start.
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K0UA
Member

Posts: 1341




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« Reply #2 on: November 10, 2017, 11:04:30 AM »

Using WSPR would be another way.  If you are not set up for digital you can use the Reverse Beacon Network on CW.  Just Call CQ with your call a few times and go to the reverse beacon network, and look for your callsign, and see how far you got.

Any chance you can let out an end fed wire?

http://www.reversebeacon.net/

http://wsprnet.org/drupal/wsprnet/map
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KU3X
Member

Posts: 411




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« Reply #3 on: November 10, 2017, 11:41:58 AM »

Build a magnetic loop and put it next to a window.
Barry
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KE7KXS
Member

Posts: 16




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« Reply #4 on: November 10, 2017, 03:09:18 PM »

All great suggestions! Thank you, I'll give them a shot.

Q: how would I listen to a remote internet receiver?

Thank you, Caesar.
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K0UA
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Posts: 1341




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« Reply #5 on: November 10, 2017, 04:47:57 PM »

All great suggestions! Thank you, I'll give them a shot.

Q: how would I listen to a remote internet receiver?

Thank you, Caesar.

Check out some of the links on this page..

https://www.dxzone.com/catalog/Internet_and_Radio/Online_Receivers/
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WA3SKN
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Posts: 6490




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« Reply #6 on: November 11, 2017, 02:24:07 PM »

OK, third story apt.
Do you have a balcony or the dreaded "picture window"?  Are there ANY windows near the radio setup?

-Mike.
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KH2BR
Member

Posts: 237




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« Reply #7 on: November 13, 2017, 11:02:42 AM »

When I was single in the Air Force barracks, I used a steel safety wire end feed long wire. It could not be seen.
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G8JNJ
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Posts: 655


WWW

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« Reply #8 on: November 13, 2017, 11:48:51 AM »

More internet WEB SDR receivers around the world can be found here

http://www.websdr.org/

and here

http://rx.linkfanel.net/

Very useful for remote listening and various antenna tests.

Regards,

Martin - G8JNJ

SUWS Web SDR            -   http://websdr.suws.org.uk
SWUK KiWi Web SDR    -   http://southwest.ddns.net:8073/

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KE7KXS
Member

Posts: 16




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« Reply #9 on: November 15, 2017, 06:24:11 PM »

Hi Martin, Thank you, I'll check those out.

At the moment, I've tried out a simple horizontal 10m loop antenna housed in another room. It seems OK, SWR is about 2.0, but I haven't made any contact with it.

I splurged a little with this week's paycheck and got a BuddiPole, but setting it up as a vertical. It's a little more versatile for other bands, and takes up very little space.

I've tried WSPR with both antenna and I don't seem to be heard anywhere. How does it take from transmission to get on the map anyway?

Cheers, Caesar.
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KE7KXS
Member

Posts: 16




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« Reply #10 on: Today at 10:34:41 AM »

During antenna testing, it turns out the settings on my radio wasn't complete.

Fixed, I can be heard using the 10m homebrew loop antenna (quad). I used a full wave 10m wire length. Currently testing it with 40m as a quarter wave antenna.

The BuddiPole will be useful outdoors in the Spring/Summer/Falls.
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ONAIR
Member

Posts: 3525




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« Reply #11 on: Today at 06:07:37 PM »

An end fed antenna might work for you!  You could run a 10 foot PVC pole horizontally out your window, then string the wire through it and allow the rest to dangle down at a 90 degree angle towards the ground.  The "Ultimax-100" end fed antenna might be suitable, as it is only 24 feet in total length.
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