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Re: Balun

[email protected]
 

Just a little info on your question...

A 1:1 current balun is equivalent to a transmission line running
through a choke core - by isolating one side from the other to
non-differential conditions, it prevents rf from getting back down the
feedline once it's "released" from the transmission line at the
connection to the antenna. This helps to force equal currents to flow
in the antenna legs, as they have nowhere else to go (so to speak). A
sleeve-type balun (a few cores strung on the coax at the feedpoint)
will work identically.

A 1:1 Voltage balun is a 1:1 transformer, with one side (feed)
referenced to ground (the shield) and the other side floating (the
antenna). Either works fine, but the current type has the advantage
of limiting rf on the outside of your coax in the case of reflected
power.

Voltage baluns show up when someone is trying to create a ratio other
than a whole-number-squared (1:1, 4:1, 9:1) like, for instance, 6:1
as these cannot be created with the "transmission line through a core"
model. Thus they resort to the transformer model instead.


Regards... Robert







Can anyone enlighten me regarding the difference between a 1:1
balun
marked as a "Current Type" and another 1:1 marked only as a balun?
I am
going to use either one to couple unbalanced coax to a flat top
dipole.


thanks

Don Johnson





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Re: New Antenna for the FT-817 and other QRP portables...

[email protected]
 

--- In FT817@y..., "David Henn" <drhenn@y...> wrote:

I agree with Bob, Just read what they say.(carefully)
Am I missing something here? Isn't the *point* of the whole elaborate
joke obviously to lampoon claims for small antennas on the FT-817?

Frank
AB2KT
Re: New Antenna for the FT-817 and other QRP portables...

 

--- In FT817@y..., Bob Camp <bob@c...> wrote:
Hi Pres,
I think the issue is the frame of reference.
"exhibits remarkable DX performance for a 50-inch whip on the FT-
817"

Bob Camp
KB8TQ
Hello,

I agree with Bob, Just read what they say.(carefully)

I'm sure it will work a lot better than just sticking a single
50" whip in the back of the FT817 with no tuning arangement,
On it's non-resonant frequencies that is.

Rgds - David
Re: Slinky Spring Dipole.

[email protected]
 

--- In FT817@y..., Charles Scott <cscott@g...> wrote:

...tuning changes drastically with even small movements of the
Slinky...
I wonder if continual motion of the antenna due to even light
breezes would make it difficult to use outside.
In an older ARRL Handbook (1979?) I recall a discussion of helical HF
antennas. The strong suggestion is to use capacitance hats to, among
other things, broaden the "sweet spot" -- for example, a pair of
crossed 18" stiff wires (#10 or #12) at each end. Might help damp the
effect of small movements.

Frank
AB2KT
Re: Slinky Spring Dipole.

Charles Scott
 

Ray:
I used a "Slinky" antenna running QRP CW from an appartment a while ago.
The one think that's obvious when you start to play with it is that the
tuning changes drastically with even small movements of the Slinky. While
it worked well inside and I worked an amazing array of stations with only
a few watts, I wonder if continual motion of the antenna due to even light
breezes would make it difficult to use outside.

Chuck

On Fri, 15 Jun 2001 raydotl@... wrote:

Has anyone use the "Slinky Spring" dipole (CQ - December, 1980)
with the FT817?
If so, comment/criticism appreciated.
Ray, G4NJW.
Re: Fw: SSB Filter - Help!

 

There is something wrong. First, be sure the filter is installed
correctly. When installed, you should be able to read the lable on
the filter (some folks have tried to put it in upside down). Be sure
the 4 pins go to the 4 sockets. When the filter is placed in and out
using menu #38, you should hear only a slight change in audio (more
highs and more lows with the new filter). With the filter, noise
sounds more like white noise. You will hear the difference more with
a good external speaker. What you are experiencing is wrong. If the
above doesn't fix it, likely you have a bad filter. But then ....

GL es 72 de Barry - W4WB



--- In FT817@y..., "FREECOM" <ede@l...> wrote:
Hi OMs ,

just a technical info about the FT-817E : I bought the YF-122S
filter for the SSB , I installed but it seems to don't work : when I
select SSB OP FILTER from the menu 38 the noise go down to zero , and
this could be good , but the signals , also if strong , disappears
completely ; if I do the same test without the filter I obtain the
same result : when SSB OP FILTER is turned on from the menu the noise
and the signal disappear .

Is it the radio or the filter to don't work properly ???? I hope
the filter !!!

Please answer soon

73 de IW1QBS :-(
Fw: SSB Filter - Help!

FREECOM
 

Hi OMs ,

just a technical info about the FT-817E : I bought the YF-122S filter for the SSB , I installed but it seems to don't work : when I select SSB OP FILTER from the menu 38 the noise go down to zero , and this could be good , but the signals , also if strong , disappears completely ; if I do the same test without the filter I obtain the same result : when SSB OP FILTER is turned on from the menu the noise and the signal disappear .

Is it the radio or the filter to don't work properly ???? I hope the filter !!!

Please answer soon

73 de IW1QBS :-(
Re: New Antenna for the FT-817 and other QRP portables...

Glyph
 

Miracle Whip salad dressing (imitation mayonnaise) must not be sold in
Canada. This won't be the first time a wonderful-sounding product name in
one country came out sounding funny in another country.

I'm a bit suspicious of no ground or counterpoise required. But it really is
time to do an antenna shootout between all these products. We could sell an
article on that to QST. Or have them do the testing.

Next thing someone will have a device to turn all our house wiring into a
GIANT, HOUSE-SIZED DX ANTENNA!

-- Bil KD6JUI

----- Original Message -----
From: <lebloke@...>
To: <FT817@...>
Sent: Friday, June 15, 2001 9:54 AM
Subject: [FT817] New Antenna for the FT-817 and other QRP portables...


Press Release

June 15th, 2001
Montreal, Quebec


The Miracle Antenna Company is pleased to announce the release of The
Miracle Whip for the FT-817.

The Miracle Whip is an all-band (1.8 to 450 mhz) 50-inch whip antenna
with integrated tuner for transmitting and receiving that mounts
directly on the FT-817. It operates with a typical SWR of 2:1 or
better across this entire range, and may be operated without a ground.

The Miracle Whip exhibits remarkable DX performance for a 50-inch
whip on the FT-817 (and should do just as well on any similar rig). We
have consistently worked DX stations on SSB under good conditions in
our tests; we are confident there is no other antenna its size on the
market that will perform as well or better. In fact we believe there
is no other antenna like it on the market, period.

The Miracle Whip uses a uniquely designed C-VAT - a Continuously
Variable Autotransformer - to match the whip to the 50-ohm output of
the radio. Tune-up may be accomplished simply by peaking the one-knob
tuning dial for maximim signal strength on receive - the antenna is
then tuned for transmitting.

The July issue of QST magazine will contain an article by our chief
designer, Robert Victor VA2 ERY, on building a Miracle Whip yourself.
We have engineered an electrically similar, but mechanically
different, high-quality precision-mechanism version of this antenna
built to commercial standards to offer to our clients.

The Miracle Whip will retail for $109.95, but may be ordered for a
limited time via our website for $79.95. Groups members are invited to
visit www.miracleantenna.com to review more information on the Miracle
Whip and our other fine products.

Readers may submit questions regarding The Miracle Whip to
lebloke@....

Thank you!



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FT817-unsubscribe@... and for a great FAQ ( Frequently Asked
Questions ) see
Please note that your messages and files sent to this group become public
domain upon submission and may appear anywhere on the Internet or in print
without notice or compensation.



Your use of Yahoo! Groups is subject to


ClearSpeech

 

After being told by several hams how great the ClearSpeech DSP
performed, I decided to pick one up in Dayton. Sold Out! OK, no
shipping charges and a good discount for a 4-week wait. I got it
yesterday at last.

I hooked it up to the the 817 and the SP-8 speaker. This device
takes the external speaker output of the 817 and processes it before
feeding it to the external speaker. ClearSpeech is manufactured by
Noise Cancellation Technologies (NCT Group) and sold by Am-Com
(www.amcominc.com).

I have tried it on CW and SSB. The noise reduction is impressive and
allowed me to hear stations that I couldn't otherwise.

It costs about the same as a filter for the 817 and is well worth
it. Now I have to figure out how to share it with my other rigs!

72 de Barry - W4WB
Re: Slinky Spring Dipole.

Glyph
 

I could never get slinky antennas to do that well in field operation using
QRP. Also, they droop. To cure that in the dipole configuration, you need a
slinky bra.

-- Bil KD6JUI

----- Original Message -----
From: Dan D. <ORNurse362@...>
To: <FT817@...>
Sent: Friday, June 15, 2001 2:56 PM
Subject: [FT817] Re: Slinky Spring Dipole.


Ray, if you try it, make sure you use the metal slinkies....the
plastic ones do not load up very well at all ..... Hi.

Dan
KD7GCO




--- In FT817@y..., raydotl@b... wrote:
Has anyone use the "Slinky Spring" dipole (CQ - December, 1980)
with the FT817?
If so, comment/criticism appreciated.
Ray, G4NJW.

To unsubscribe from this group, send an email to:
FT817-unsubscribe@... and for a great FAQ ( Frequently Asked
Questions ) see
Please note that your messages and files sent to this group become public
domain upon submission and may appear anywhere on the Internet or in print
without notice or compensation.



Your use of Yahoo! Groups is subject to


Re: Help: On vacation left manual and Power Supply at home

 

Hi Jeffrey,

From the FAQ ----

"Is there a light-weight power supply that can be used with the FT-
817? YES, there are a number of them. One relatively inexpensive,
small, and light-weight power for the FT-817 is the Radio Shack part
number 22-503. Regular price is $50. Beware that this is a switching
power supply and can create noise in the rig. This particular power
supply from Radio Shack has a mixed history. Some works just fine and
others are noisy. You might take your rig to the store and try out
different ones until you fine a quiet one."

"Where can I get a DC power plug for the FT-817? It is a coax-style
plug having dimensions of 4.0 x 1.7 mm. One source is Radio Shack and
the part number is 274-1532. WARNING: The power jack is not the most
durable jack seen, so be careful not to try to force the wrong size
plug into the jack."

Have a good vacation.

GL es 72 de Barry - W4WB




-- In FT817@y..., jeffreys@c... wrote:
(I don't have access to e-mail here so please post publically if
possible).

I left my manual at home and am trying to figure out which small
powersupply to buy at the local Radio Shack.

I remember its a 4mm by 1.7mm (Radio Shack "B") but what power
supply
should I get. I remember something in the 13 volt range but what
miliamp range?

If anyone has a RS part number that would be helpful in addition to
a
description of what I did.

On a separate note I just realized that my car charger for my VX-5R
works on the FT-817.

If anyone wants to try a sked with me, I am in Berkshire county, MA
in Stockbridge, MA.

Thanks for the help group. This has to be one of the most active
groups I subscribe to.

Thanks.

--Jeffrey Steinberg, K2MIT
Help: On vacation left manual and Power Supply at home

[email protected]
 

(I don't have access to e-mail here so please post publically if
possible).

I left my manual at home and am trying to figure out which small
powersupply to buy at the local Radio Shack.

I remember its a 4mm by 1.7mm (Radio Shack "B") but what power supply
should I get. I remember something in the 13 volt range but what
miliamp range?

If anyone has a RS part number that would be helpful in addition to a
description of what I did.

On a separate note I just realized that my car charger for my VX-5R
works on the FT-817.

If anyone wants to try a sked with me, I am in Berkshire county, MA
in Stockbridge, MA.

Thanks for the help group. This has to be one of the most active
groups I subscribe to.

Thanks.

--Jeffrey Steinberg, K2MIT
Amami Oshia

S.L. Herman
 

I'm QRV through Sunday evening Asia time on various isles
of Amami Oshima (IOTA AS 023) as 7J1AIL/6/QRP with FT-817
and MP1 and ATX antennas among others. Cndx don't seem so good
today.
Won't be back on the net after this (no access from other islands
I'm told), but will be listening 6m, 10FM and on CW on other bands
around the All-Asia contest. Will try to call on some HF pack calling
freqs later today.

72,

Steven
K7USJ
7J1AIL
T88SH
Proper Battery

[email protected]
 

Never Mind :-))

Frank
Proper battery

[email protected]
 

I just received a battery ( a W&W HC-091X4M-FNB72M) which is supposed
to be a exact replacement for the orginal battery. Noticed on the
schematic that there is a requirement for a battery with a tap at the
4.5 volt level. This buss is called the BATT buss. Anyone else run
into this? Do the orginal batteries from Yaesu have a tap at the mid
point.

Thanks

Frank
W9LVC
Re: Slinky Spring Dipole.

Dan D.
 

Ray, if you try it, make sure you use the metal slinkies....the
plastic ones do not load up very well at all ..... Hi.

Dan
KD7GCO

--- In FT817@y..., raydotl@b... wrote:
Has anyone use the "Slinky Spring" dipole (CQ - December, 1980)
with the FT817?
If so, comment/criticism appreciated.
Ray, G4NJW.
Re: New Antenna for the FT-817 and other QRP portables...

Pres Waterman
 

I appreciate it...

And all the calls are clear

Thanks

Pres Waterman W2PW
c/o Patchogue Motors, Inc.
Long Island Ford and Kia dealer

GO BILLS!

----- Original Message -----
From: Bob Camp <bob@...>
To: <FT817@...>
Sent: Friday, June 15, 2001 4:45 PM
Subject: Re: [FT817] New Antenna for the FT-817 and other QRP portables...


Hi Pres,

I think the issue is the frame of reference.

"exhibits remarkable DX performance for a 50-inch whip on the FT-817"

I suspect it works *every* bit as well as any other 2:1 VSWR / 50 inch
long whip mounted on a one square foot ground plane on 160 meters .....

It's a little like "goes just as fast as my Buick, after I hit the tree
..."

Note that I carefully avoided bringing KIA, my Ford Expedition, or the
Bills into the conversation :)

Bob Camp
KB8TQ

-----Original Message-----
From: Pres Waterman [mailto:pres@...]
Sent: Friday, June 15, 2001 3:38 PM
To: FT817@...
Subject: Re: [FT817] New Antenna for the FT-817 and other QRP
portables...


Is it April 1 already?

Thanks

Pres Waterman W2PW
c/o Patchogue Motors, Inc.
Long Island Ford and Kia dealer

GO BILLS!
----- Original Message -----
From: <lebloke@...>
To: <FT817@...>
Sent: Friday, June 15, 2001 12:54 PM
Subject: [FT817] New Antenna for the FT-817 and other QRP portables...


> Press Release
>
> June 15th, 2001
> Montreal, Quebec
>
>
> The Miracle Antenna Company is pleased to announce the release of The
> Miracle Whip for the FT-817.
>
> The Miracle Whip is an all-band (1.8 to 450 mhz) 50-inch whip antenna
> with integrated tuner for transmitting and receiving that mounts
> directly on the FT-817. It operates with a typical SWR of 2:1 or
> better across this entire range, and may be operated without a ground.
>
> The Miracle Whip exhibits remarkable DX performance for a 50-inch
> whip on the FT-817 (and should do just as well on any similar rig). We
> have consistently worked DX stations on SSB under good conditions in
> our tests; we are confident there is no other antenna its size on the
> market that will perform as well or better. In fact we believe there
> is no other antenna like it on the market, period.
>
> The Miracle Whip uses a uniquely designed C-VAT - a Continuously
> Variable Autotransformer - to match the whip to the 50-ohm output of
> the radio. Tune-up may be accomplished simply by peaking the one-knob
> tuning dial for maximim signal strength on receive - the antenna is
> then tuned for transmitting.
>
> The July issue of QST magazine will contain an article by our chief
> designer, Robert Victor VA2 ERY, on building a Miracle Whip yourself.
> We have engineered an electrically similar, but mechanically
> different, high-quality precision-mechanism version of this antenna
> built to commercial standards to offer to our clients.
>
> The Miracle Whip will retail for $109.95, but may be ordered for a
> limited time via our website for $79.95. Groups members are invited to
> visit www.miracleantenna.com to review more information on the Miracle
> Whip and our other fine products.
>
> Readers may submit questions regarding The Miracle Whip to
> lebloke@....
>
> Thank you!
>






To unsubscribe from this group, send an email to:
FT817-unsubscribe@... and for a great FAQ ( Frequently Asked
Questions ) see
Please note that your messages and files sent to this group become public
domain upon submission and may appear anywhere on the Internet or in print
without notice or compensation.



Your use of Yahoo! Groups is subject to

Slinky Spring Dipole.

[email protected]
 

Has anyone use the "Slinky Spring" dipole (CQ - December, 1980)
with the FT817?
If so, comment/criticism appreciated.
Ray, G4NJW.
Re: New Antenna for the FT-817 and other QRP portables...

[email protected]
 

"Miracle Whip" I have some of that in my frig. Great on turkey
sandwiches....

Dave

--- In FT817@y..., lebloke@n... wrote:
Press Release

June 15th, 2001
Montreal, Quebec


The Miracle Antenna Company is pleased to announce the release of
The
Miracle Whip for the FT-817.

The Miracle Whip is an all-band (1.8 to 450 mhz) 50-inch whip
antenna
with integrated tuner for transmitting and receiving that mounts
directly on the FT-817. It operates with a typical SWR of 2:1 or
better across this entire range, and may be operated without a
ground.

The Miracle Whip exhibits remarkable DX performance for a 50-inch
whip on the FT-817 (and should do just as well on any similar rig).
We
have consistently worked DX stations on SSB under good conditions
in
our tests; we are confident there is no other antenna its size on
the
market that will perform as well or better. In fact we believe
there
is no other antenna like it on the market, period.

The Miracle Whip uses a uniquely designed C-VAT - a Continuously
Variable Autotransformer - to match the whip to the 50-ohm output
of
the radio. Tune-up may be accomplished simply by peaking the
one-knob
tuning dial for maximim signal strength on receive - the antenna is
then tuned for transmitting.

The July issue of QST magazine will contain an article by our chief
designer, Robert Victor VA2 ERY, on building a Miracle Whip
yourself.
We have engineered an electrically similar, but mechanically
different, high-quality precision-mechanism version of this antenna
built to commercial standards to offer to our clients.

The Miracle Whip will retail for $109.95, but may be ordered for a
limited time via our website for $79.95. Groups members are invited
to
visit www.miracleantenna.com to review more information on the
Miracle
Whip and our other fine products.

Readers may submit questions regarding The Miracle Whip to
lebloke@n...

Thank you!
Re: New Antenna for the FT-817 and other QRP portables...

Bob Camp
 

Hi Pres,

I think the issue is the frame of reference.

"exhibits remarkable DX performance for a 50-inch whip on the FT-817"

I suspect it works *every* bit as well as any other 2:1 VSWR / 50 inch long whip mounted on a one square foot ground plane on 160 meters .....

It's a little like "goes just as fast as my Buick, after I hit the tree ..."

Note that I carefully avoided bringing KIA, my Ford Expedition, or the Bills into the conversation :)

Bob Camp
KB8TQ

-----Original Message-----
From: Pres Waterman [mailto:pres@...]
Sent: Friday, June 15, 2001 3:38 PM
To: FT817@...
Subject: Re: [FT817] New Antenna for the FT-817 and other QRP portables...


Is it April 1 already?

Thanks

Pres Waterman W2PW
c/o Patchogue Motors, Inc.
Long Island Ford and Kia dealer

GO BILLS!
----- Original Message -----
From: <lebloke@...>
To: <FT817@...>
Sent: Friday, June 15, 2001 12:54 PM
Subject: [FT817] New Antenna for the FT-817 and other QRP portables...


> Press Release
>
> June 15th, 2001
> Montreal, Quebec
>
>
> The Miracle Antenna Company is pleased to announce the release of The
> Miracle Whip for the FT-817.
>
> The Miracle Whip is an all-band (1.8 to 450 mhz) 50-inch whip antenna
> with integrated tuner for transmitting and receiving that mounts
> directly on the FT-817. It operates with a typical SWR of 2:1 or
> better across this entire range, and may be operated without a ground.
>
> The Miracle Whip exhibits remarkable DX performance for a 50-inch
> whip on the FT-817 (and should do just as well on any similar rig). We
> have consistently worked DX stations on SSB under good conditions in
> our tests; we are confident there is no other antenna its size on the
> market that will perform as well or better. In fact we believe there
> is no other antenna like it on the market, period.
>
> The Miracle Whip uses a uniquely designed C-VAT - a Continuously
> Variable Autotransformer - to match the whip to the 50-ohm output of
> the radio. Tune-up may be accomplished simply by peaking the one-knob
> tuning dial for maximim signal strength on receive - the antenna is
> then tuned for transmitting.
>
> The July issue of QST magazine will contain an article by our chief
> designer, Robert Victor VA2 ERY, on building a Miracle Whip yourself.
> We have engineered an electrically similar, but mechanically
> different, high-quality precision-mechanism version of this antenna
> built to commercial standards to offer to our clients.
>
> The Miracle Whip will retail for $109.95, but may be ordered for a
> limited time via our website for $79.95. Groups members are invited to
> visit www.miracleantenna.com to review more information on the Miracle
> Whip and our other fine products.
>
> Readers may submit questions regarding The Miracle Whip to
> lebloke@....
>
> Thank you!
>
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