receiving HF antenna for urban conditions
 

Hi,

I'm moving to a new urban QTH in and trying to figure out the best HF
antenna installation.

I'd like to have distinct HF antennas for RX and TX: a vertical for TX
where only performance matters and "something" for RX where the main
problem is going to be tons and tons of local QRM.

I don't know what could be this "something". I'd probably like some
kind of loop or small dipole or whatever I can point and can be
isolated as much as possible from local noise received in the
supporting mast and feed line themselves. It should be something
physically small because of neighbors, etc.

I'd prefer to build them myself but would buy them if something seemed
interesting enough.

Feedline is going to be about 100 ft long

What would be your suggestion?

Thanks

--
EA3FYA - Toni

receiving HF antenna for urban conditions
 

"Toni" wrote in news:1162730946.761930.152060
@h54g2000cwb.googlegroups.com:

Hi,

I'm moving to a new urban QTH in and trying to figure out the best HF
antenna installation.

I'd like to have distinct HF antennas for RX and TX: a vertical for TX
where only performance matters and "something" for RX where the main
problem is going to be tons and tons of local QRM.

I don't know what could be this "something". I'd probably like some
kind of loop or small dipole or whatever I can point and can be
isolated as much as possible from local noise received in the
supporting mast and feed line themselves. It should be something
physically small because of neighbors, etc.

I'd prefer to build them myself but would buy them if something seemed
interesting enough.

Feedline is going to be about 100 ft long

What would be your suggestion?

I'm using an 8 foot mobile hamstick horizontal off my back balcony in a
2nd floor apartment. The noise is a problem, but I can mitigate it quite
a bit with my MFJ-1026 which allows me to have a second receive antenna
and beat it against the main transceiver antenna for the purpose of
phasing out the noise.



--
Dave Oldridge+
ICQ 1800667

receiving HF antenna for urban conditions
 

Dave Oldridge wrote:

I'm using an 8 foot mobile hamstick horizontal off my back balcony in a
2nd floor apartment. The noise is a problem, but I can mitigate it quite
a bit with my MFJ-1026 which allows me to have a second receive antenna
and beat it against the main transceiver antenna for the purpose of
phasing out the noise.


That's an interesting possibility but probably not useful for multiband
operation considering the antennas will be at the roof which is 4
stories (is that the right word?) above my apartment. But makes me
think of some kind of close phased small monopoles with a separate
preamplifier for each and the phasing network down at the apartment.
Will try to do some modeling and see if it is doable. Reminds me of the
Flag/Pennant antenna. Probably too big.

Thanks,

--
EA3FYA - Toni

receiving HF antenna for urban conditions
 

On 5 Nov 2006 04:49:06 -0800, "Toni" wrote:

Hi,

I'm moving to a new urban QTH in and trying to figure out the best HF
antenna installation.

I'd like to have distinct HF antennas for RX and TX: a vertical for TX
where only performance matters and "something" for RX where the main
problem is going to be tons and tons of local QRM.

I don't know what could be this "something". I'd probably like some
kind of loop or small dipole or whatever I can point and can be
isolated as much as possible from local noise received in the
supporting mast and feed line themselves. It should be something
physically small because of neighbors, etc.

I'd prefer to build them myself but would buy them if something seemed
interesting enough.

Feedline is going to be about 100 ft long

What would be your suggestion?

Thanks


Toni,
If you want separate antennas, (aerials), and IF you have the room,
(hence the 100 ft feed line), and IF you want to build the thing your
self. . . Might I suggest for your receiver, a Caged Dipole? In the
more modern world, it is referred to as a Fat Conductor Antenna. I
asked a little bit about them here, and found out a lot more than I
thought I would have, being that these are just about extinct. They
offer many possibilities for what I believe you are looking for in a
receive end application.

73's
KD7YMR
Rob

receiving HF antenna for urban conditions
 

"Toni" wrote in
oups.com:


Dave Oldridge wrote:

I'm using an 8 foot mobile hamstick horizontal off my back balcony in
a 2nd floor apartment. The noise is a problem, but I can mitigate it
quite a bit with my MFJ-1026 which allows me to have a second receive
antenna and beat it against the main transceiver antenna for the
purpose of phasing out the noise.


That's an interesting possibility but probably not useful for
multiband operation considering the antennas will be at the roof which
is 4 stories (is that the right word?) above my apartment. But makes
me think of some kind of close phased small monopoles with a separate
preamplifier for each and the phasing network down at the apartment.
Will try to do some modeling and see if it is doable. Reminds me of
the Flag/Pennant antenna. Probably too big.

Actually, any small wire whip just base fed out on the roof would do for
the noise antenna. It doesn't have to be efficient, since the unit has a
pretty high gain preamp in it for the noise antenna.


--
Dave Oldridge+
ICQ 1800667