--- In ultralightdx@..., "g4irx_uk" <nick@...> wrote:

Hi,

I've looked at some of the amazing ferrite rod antennas for ultralights.

Has anybody tried a tuned loop antenna in place of the ferrite rod, letting the si4734 do the tuning rather than a capacitor on the loop? I have a large hexagonal loop and I'm considering mounting the PL-380 on the loop frame itself, disconnecting the internal ferrite.

Nick.

On 6/27/2011 6:47 PM, g4irx_uk wrote:

Hi,

I've looked at some of the amazing ferrite rod antennas for ultralights.

Has anybody tried a tuned loop antenna in place of the ferrite rod, letting the si4734 do the tuning rather than a capacitor on the loop? I have a large hexagonal loop and I'm considering mounting the PL-380 on the loop frame itself, disconnecting the internal ferrite.

Nick.

--- In ultralightdx@..., Rick Robinson <w4dst@...> wrote:

Hi Nick,

If you are handy with a soldering iron, the PL-310 is very simple to
modify for external antennas. See the group files section for the
"Laurie" mod to the PL-310. The PL-380 mod is more involved but is a
better radio due to its lack of extreme soft mute and AGC issues that
the '310 has. I have modified my '310 and 2 '380s for use with external
antennas. The Si4734 will tune any antenna in the 180uH to 400uH range
with its built-in 500pf - 20pF varactor. No need to purchase bulky
tuning capacitors, it's all in the radio. I used 1/8" stereo jacks on
my PL-380s, and depending on the type of jack you use,you can keep the
internal ferrite bar in place and usable when the external antenna is
not being used.

I use a 24 inch spiral wound loop antenna with an inductance of 260uH
with my ULRs. BTW, a spiral wound loop has much sharper peaks and nulls
than ferrite bar and "box wound" loops and is much quieter than ferrite
bar antennas. However it is somewhat more difficult to construct than a
"box wound" loop and is not as easily transported as a ferrite bar.

I've been using these modified ULRs for almost a year with no problems
at all. The Si4734 is a robust chip and does an excellent job of tuning
external MW antennas without use of external capacitors.

Good DXing,

Rick W4DST


On 6/27/2011 6:47 PM, g4irx_uk wrote:

Hi,

I've looked at some of the amazing ferrite rod antennas for ultralights.

Has anybody tried a tuned loop antenna in place of the ferrite rod, letting the si4734 do the tuning rather than a capacitor on the loop? I have a large hexagonal loop and I'm considering mounting the PL-380 on the loop frame itself, disconnecting the internal ferrite.

Nick.

-----Original Message-----
From: farmerik <farmerik@...>
To: ultralightdx <ultralightdx@...>
Sent: Tue, Jun 28, 2011 1:55 pm
Subject: [ultralightdx] Re: Tuned loop antenna

 
I would like to hear more about your spiral loop antenna, such as the
wire you used, and the spacing between turns.

I also experimented with diamond weave and rook wound coils of 10-12
inches on both AM and LW. Mostly I was hoping for TA LW, but it never
happened. Each coil acted differently, that is for sure. I have pretty
much given up trying for TA LW on a ULR without an amplified antenna.
Now I am more interested in AM BCB. - FARMERIK

P.S. - Was that a typo about the 310 being worse than the 380 regarding
soft mute? I thought it was the other way around, but I can easily be
confused.

--- In ultralightdx@..., Rick Robinson <w4dst@...>
wrote:

Hi Nick,

&gt; If you are handy with a soldering iron, the PL-310 is very simple
to
&gt; modify for external antennas. See the group files section for the

"Laurie" mod to the PL-310. The PL-380 mod is more involved but

is a
&gt; better radio due to its lack of extreme soft mute and AGC issues
that
&gt; the '310 has. I have modified my '310 and 2 '380s for use with
external

antennas. The Si4734 will tune any antenna in the 180uH to 400uH

range

with its built-in 500pf - 20pF varactor. No need to purchase

bulky

tuning capacitors, it's all in the radio. I used 1/8" stereo

jacks on

my PL-380s, and depending on the type of jack you use,you can keep

the

internal ferrite bar in place and usable when the external antenna

is

not being used.

I use a 24 inch spiral wound loop antenna with an inductance of

260uH

with my ULRs. BTW, a spiral wound loop has much sharper peaks and

nulls

than ferrite bar and "box wound" loops and is much quieter than

ferrite

bar antennas. However it is somewhat more difficult to construct

than a

"box wound" loop and is not as easily transported as a ferrite bar.

I've been using these modified ULRs for almost a year with no

problems

at all. The Si4734 is a robust chip and does an excellent job of

tuning

external MW antennas without use of external capacitors.

Good DXing,

Rick W4DST


On 6/27/2011 6:47 PM, g4irx_uk wrote:

Hi,

I've looked at some of the amazing ferrite rod antennas for

ultralights.

Has anybody tried a tuned loop antenna in place of the

ferrite rod, letting the si4734 do the tuning rather than a capacitor
on the loop? I have a large hexagonal loop and I'm considering mounting
the PL-380 on the loop frame itself, disconnecting the internal ferrite.

Nick.

--- In ultralightdx@..., D1028Gary@... wrote:

<<< I have pretty much given up trying for TA LW on a ULR without an
amplified antenna. >>>

Hello Farmerik,

For receiving Longwave TA's on an Ultralight radio, you might want to
consider using your 7.5" LW plug-in loopstick with your PL-360 next
winter. Both Richard Allen (in Oklahoma) and Rob Ross (in Ontario) have
received multiple Longwave TA's from Europe and Africa using such an
antenna, and they are both a lot farther from the TA's (and the
Atlantic Ocean) than you.

73, Gary DeBock (in Puyallup, WA)

-----Original Message-----
From: farmerik <farmerik@...>
To: ultralightdx <ultralightdx@...>
Sent: Tue, Jun 28, 2011 1:55 pm
Subject: [ultralightdx] Re: Tuned loop antenna

 
I would like to hear more about your spiral loop antenna, such as the
wire you used, and the spacing between turns.

I also experimented with diamond weave and rook wound coils of 10-12
inches on both AM and LW. Mostly I was hoping for TA LW, but it never
happened. Each coil acted differently, that is for sure. I have pretty
much given up trying for TA LW on a ULR without an amplified antenna.
Now I am more interested in AM BCB. - FARMERIK

P.S. - Was that a typo about the 310 being worse than the 380 regarding
soft mute? I thought it was the other way around, but I can easily be
confused.

--- In ultralightdx@..., Rick Robinson w4dst@
wrote:

Hi Nick,

If you are handy with a soldering iron, the PL-310 is very simple

to

modify for external antennas. See the group files section for the
"Laurie" mod to the PL-310. The PL-380 mod is more involved but

is a

better radio due to its lack of extreme soft mute and AGC issues

that

the '310 has. I have modified my '310 and 2 '380s for use with

external

antennas. The Si4734 will tune any antenna in the 180uH to 400uH

range

with its built-in 500pf - 20pF varactor. No need to purchase

bulky

tuning capacitors, it's all in the radio. I used 1/8" stereo

jacks on

my PL-380s, and depending on the type of jack you use,you can keep

the

internal ferrite bar in place and usable when the external antenna

is

not being used.

I use a 24 inch spiral wound loop antenna with an inductance of

260uH

with my ULRs. BTW, a spiral wound loop has much sharper peaks and

nulls

than ferrite bar and "box wound" loops and is much quieter than

ferrite

bar antennas. However it is somewhat more difficult to construct

than a

"box wound" loop and is not as easily transported as a ferrite bar.

I've been using these modified ULRs for almost a year with no

problems

at all. The Si4734 is a robust chip and does an excellent job of

tuning

external MW antennas without use of external capacitors.

Good DXing,

Rick W4DST


On 6/27/2011 6:47 PM, g4irx_uk wrote:

Hi,

I've looked at some of the amazing ferrite rod antennas for

ultralights.

Has anybody tried a tuned loop antenna in place of the

ferrite rod, letting the si4734 do the tuning rather than a capacitor
on the loop? I have a large hexagonal loop and I'm considering mounting
the PL-380 on the loop frame itself, disconnecting the internal ferrite.

Nick.

-----Original Message-----
From: farmerik <farmerik@...>
To: ultralightdx <ultralightdx@...>
Sent: Wed, Jun 29, 2011 12:00 pm
Subject: [ultralightdx] Re: Tuned loop antenna

 
I am planning on spending a few days right on the beach in Maine again
this Fall, and will bring it with me. Last year for some unknown reason
the '360 would not switch to receive LW while I was there, although I
have not had that problem at any other time before or after that
vacation.

- FARMERIK

--- In ultralightdx@..., D1028Gary@... wrote:

<<< I have pretty much given up trying for TA LW on a

ULR without an

amplified antenna. >>>

Hello Farmerik,

&gt;

For receiving Longwave TA's on an Ultralight radio, you might want

to

consider using your 7.5" LW plug-in loopstick with your PL-360

next

winter. Both Richard Allen (in Oklahoma) and Rob Ross (in Ontario)

have

received multiple Longwave TA's from Europe and Africa using such

an

antenna, and they are both a lot farther from the TA's (and the
Atlantic Ocean) than you.

73, Gary DeBock (in Puyallup, WA)

-----Original Message-----
From: farmerik <farmerik@...&gt;
To: ultralightdx <ultralightdx@...>
Sent: Tue, Jun 28, 2011 1:55 pm
Subject: [ultralightdx] Re: Tuned loop antenna

 
I would like to hear more about your spiral loop antenna, such as

the

wire you used, and the spacing between turns.

I also experimented with diamond weave and rook wound coils of

10-12

inches on both AM and LW. Mostly I was hoping for TA LW, but it

never

happened. Each coil acted differently, that is for sure. I have

pretty

much given up trying for TA LW on a ULR without an amplified

antenna.

Now I am more interested in AM BCB. - FARMERIK

P.S. - Was that a typo about the 310 being worse than the 380

regarding

soft mute? I thought it was the other way around, but I can easily

be

confused.

--- In ultralightdx@..., Rick Robinson w4dst@
wrote:

Hi Nick,

If you are handy with a soldering iron, the PL-310 is very

simple

to

modify for external antennas. See the group files section

for the

&gt; "Laurie" mod to the PL-310. The PL-380 mod is more involved

but

is a

better radio due to its lack of extreme soft mute and AGC

issues

that

the '310 has. I have modified my '310 and 2 '380s for use

with

external

antennas. The Si4734 will tune any antenna in the 180uH to

400uH

range

with its built-in 500pf - 20pF varactor. No need to purchase

bulky

tuning capacitors, it's all in the radio. I used 1/8" stereo

jacks on

my PL-380s, and depending on the type of jack you use,you can

keep

the

&gt; > internal ferrite bar in place and usable when the external
antenna

is

not being used.

I use a 24 inch spiral wound loop antenna with an inductance

of

260uH

with my ULRs. BTW, a spiral wound loop has much sharper

peaks and

nulls

than ferrite bar and "box wound" loops and is much quieter

than

ferrite

bar antennas. However it is somewhat more difficult to

construct

than a

"box wound" loop and is not as easily transported as a

ferrite bar.

I've been using these modified ULRs for almost a year with no

problems

at all. The Si4734 is a robust chip and does an excellent

job of

tuning

external MW antennas without use of external capacitors.

Good DXing,

Rick W4DST


On 6/27/2011 6:47 PM, g4irx_uk wrote:

Hi,

&gt; > I've looked at some of the amazing ferrite rod antennas

for

ultralights.

Has anybody tried a tuned loop antenna in place of the

ferrite rod, letting the si4734 do the tuning rather than a

capacitor

on the loop? I have a large hexagonal loop and I'm considering

mounting

the PL-380 on the loop frame itself, disconnecting the internal

ferrite.

Nick.

&gt; >