开云体育

Ray,

I'm certainly interested in trying this out. With a similar
arrangement to support the loop vertically it could possibly be
used /P in situations without anything to hang it from.

I'd be interested in more details of the feed arrangement; meanwhile
I may just try it out with my SGC Smartuner when I get it down from
the loft in preparation for moving.

Julian, G4ILO

--- In FT817@y..., "Ray Goff" <ray@g...> wrote:

Hi,

I have just got back from a week in a hotel in Belgium where I have

been

testing my 40-30-20m portable loop antenna with the FT817.

Scattered in the 350 or so emails waiting for me from this

reflector was a

discussion thread on loop antennas, so I thought I would add my
experiences...

My loop consists of 16 feet of hook up wire in a diamond shape.

Across the

diagonal of the diamond is a spreader made from three 20 inch

lengths of

dowel which are fitted together to give 60 inches by pieces of

plastic

tubing made from old felt-tip pens. Incidentally, twenty inches was

chosen

because it fits into my suitcase.

At the top of the loop is the suspension point, made from a piece

of MDF

about 3 inches square. This also mounts a three position slide

switch switch

and four bee-hive trimmers. The feedpoint, at the bottom of the

loop,

consists of a toroidal transformer housed in a 35mm film canister.

The

aerial is fed from a length of 50 Ohm coax cable terminated in a BNC
connector.

The three position switch selects a different capacitor for each

band (I

found I needed two in parallel for resonance on 40). At first I

tried

paralleling the capacitors to tune the lower bands, but the tuning

became

too interactive, so I now use different capacitors for each band.

By adjusting the turns ratio on the toroidal transformer I have

been able to

achieve 1:1 SWR on all bands.

The aerial worked surprisingly well in Belgium, so I decided to

test it

further in the WPX contest over the weekend. I hung it from the

light

fitting in the ground floor kitchen of my house and worked loads of

stations

on 40 and 20. Best DX on 20m was NW7R in Arizona, easily 7000 miles

from my

QTH in Oxford, England. On 40, I worked several Asiatic Russian

stations.

All with 5 Watts from the FT817...

You may also be interested to know that the aerial was originally

resonated

at the QRP frequencies for each band, but during the contest I

worked the

entire CW section of each band without bothering to retune.

If there is an interest in the aerial, I would be happy to write it

up

further.

Ray g4fon

-----Original Message-----
From: Glyph [mailto:bbp@a...]
Sent: 28 May 2001 01:28
To: FT817@y...
Subject: Re: [FT817] Loop antenna


It would be interesting to design a "fold-up" loop of some sort

that could

be very compact but expandable into a really efficient size. Of

couse, the

design perameters usually call for a very good conductor with no

purely

mechanical connections if at all possible. They're usually built

out of

copper pipe (anyone got gold pipe?). Here's someone's mission

impossible.

-- Bil KD6JUI

----- Original Message -----
From: Bill Walker <kd7jzb@m...>
To: <FT817@y...>
Sent: Wednesday, May 23, 2001 8:19 AM
Subject: Re: [FT817] Loop antenna

True, the efficiency of mine calculates to be around 35% at

14.1Mhz and of

course various factors will reduce it to less than that. The

thing you

have

to remember is that it was designed to be small, not efficient.

the actual

diameter of a 1/10 wave loop at this design frequency is less

than 2 feet

3

inches. If you start getting larger in diameter the radiation

pattern

changes from directional, on the plane of the loop, to omni-

directional

then back to directional, perpendicular to the plane of the loop,

as you

approach the diameter of a full wave loop. At 14.1Mhz the full

wave loop

would not fit in the back of my pickup truck. :-)

72,

At 20:56 5/22/01 -0700, you wrote:

There are optimal loop sizes for various frequencies. Yours

seems too

small

to have good radiation efficiency on 20 meters. Maybe 10 meters

or 6

meters

would be optimal. I'm too lazy to look up the optimal sizes in

the ARRL

antenna handbook.

I'm going on a 4-day fishing trip with my sons. They fish, I

fish for

contacts. This will be my first time to really put the 817

through its

paces

with various field-type antennas -- specifically, hamsticks,

G5RV-type

inverted V and 110' long wire with counterpoise. See ya at the

lake!

-- Bil KD6JUI

----- Original Message -----
From: Bill Walker <kd7jzb@m...>
To: <FT817@y...>
Sent: Monday, May 21, 2001 11:10 PM
Subject: Re: [FT817] Loop antenna

Check out the following web page and brows the "Antennas"

link for

"Small

HF Transmitting Loop Antennas".



Steve has a loop design program free to download which works

very

well.

Actually loops are very simple to build. I have a 2 foot 6

inch

diameter

loop which tunes 20M thru 12M and appears to be comparable in

performance

to my half wave dipole.
After completing construction of my loop I set it on top of a

cheap

camera

tripod in the shack about 4 feet above the floor and using my

trusty

FT-817

at 5 watts, answered N8LWV calling CQ on 20M (ssb) from Grand

Rapids

Michigan. I really didn't think he would hear me but he came

back with

a

339 signal report! Not bad from Tucson Arizona!
I built my loop out of half inch soft copper tubing made for

water

lines.

I

purchased the tubing at Home Depot in a 10 foot coil for a

little over

$10.

The small 6 inch diameter primary loop is made from #6 copper

wire.

I like my loop for portable operation like when I want to

grab the

radio

and go to the park, and it seems to work pretty well 7 or 8

feet above

the

ground. I'm sure it would work better up higher, I use mine

oriented

vertically. The loop has a very high Q resulting in a narrow

bandwidth

of

only a few Khz. This means that you must retune the loop if

you vary

your

frequency very much. This is fine when using CW or PSK31 but

is to

narrow

for SSB unless you have a motorized tuning capacitor so that

you can

retune

easily. I believe that MFJ has a loop with some form of

automatic

tuning

mechanism which would help immensely but from what I remember

they

want a

premium price for such an otherwise simple antenna. I spent

less than

$20

building mine but I have to manually tune it.
If you are interested, let me know and I'll put some images

on my web

page

for you to look at for ideas.

At 21:45 5/21/01 +0000, you wrote:

I remember an article some years back in PW that had a 2

merte loop

about 4 inches in diameter and it worked quite well.
Any one have a copy as I want to make a loop for 20metres

for my

FT817. Any other ideas or perhaps we should have a group for

portable

antennas.

Bill Walker - KD7JZB




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Bill Walker - KD7JZB




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Asked

Questions ) see

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Questions ) see



Your use of Yahoo! Groups is subject to

Karin at RT systems just emaile me the "FIX"

Software still performs an ilegal operation when I try to select the send data to radio mode.

Ouch!

Hello everyone!

? Just dropping a short line on a new group just starting on Yahoo called=
[PA-ham]. If you enjoy the hobby from in or around PA, we want you! ? ? ? T=
his forum was set up for hams(or future hams) in and around PA to keep up on=
news and events affecting ham radio, LOCALLY!! ? ? ?

Anything may be posted dealing with the hobby, including hamfests, fox=
-hunts, contests, special events stations, club meetings, pic-nics, ect.....=
And if you need help, maybe someone can help you locally! Extra gear sittin=
g around? Feel free to post that too! Like I said, anything dealing with the=
hobby! ?

? ? Members may also place their favorite links in the Bookmarks, along wi=
th posting your events in the Calander! What more could you ask for? ?

? ? In this day and age when we are losing so many from our ranks to the i=
nternet, what better way to merge the two? ?

? ? Please remember that this is a new forum set up for all hams in and ar=
ound Pennsylvania. The more the merrier!


? [PA-ham] To Join:
PA-ham-subscribe@...


Tnx in adv 73


Fran / N3ZHC

<N3ZHC@...>

[PA-ham] Forum Manager

Hi,

I just bought a FT 817 and the RS ni-mh 1.6 A/h cells. So as I understand
it, I have to cut the green wire, and what option of Charge time do I use. I
have the Wall Wart from Yaesu, and the DC power cable. Please adivse, and
Thank you for your time.

Regards,

John


DATE

--- In FT817@y..., "Richard B Drake" <rich@w...> wrote:

Oh my goodness man. 10 Hz at 50MHZ is .2 Parts Per Million (PPM) and 4Hz at
14MHZ is .28 PPM.

WHOOPS!!!!!!!!!!!!!!!!
Sorry guys I ment to write 100Hz.
It must be the holiday,
Bill W9WCR

Oh my goodness man. 10 Hz at 50MHZ is .2 Parts Per Million (PPM) and 4Hz at
14MHZ is .28 PPM. That's excellent considering the spec calls for 1 PPM. So
you are well within spec. You could perhaps achieve some improvement by
adding the optional TXCO but even that is only speced at .5 PPM, so you're
better than that. I think you are expecting lab standard accuracy from a
$700 transceiver - don't be silly.

----
73, Rich - W3ZJ

I just noitced the display on my 817 reads 10Hz low on 6 meters and 4Hz low+/- on the lower bands.
Does anyone know is there is a way to adjust this via software or the how to adjust this via a trim
pot?
Its not off a lot but it does bug me!
Thanks,
Bill W9WCR

I have noticed birdies on 70cm (432.625, 433.400, 434.175, 434.950, 435.725, 436.025 (strongest), 436.525, 437.300, 438.100, 438.900, 439.700) and so. They get weaker beyond 440 MHz. The ones on 436.025 MHz, 438.100 MHz and 438.900 MHz do open the squelch, all others are relatively weak. The 438.900 MHz is in particular annoying as it is a repeater output in Germany. The birdies are rather broad, resulting from the synthesizer and all occur with all antennas disconnected, PC switched off etc... I have noticed above birdies with 4 different units so far. I haven't checked VHF. It seems that we have to leave with these birdies so far or go back in time and carry the FT-290, FT-790, FT-690 and a K-2 over our shoulders.....Personally I prefer the FT-817, even with those birdies (and the other 29 on the shortwave bands...).

Tom DF2OO

Demetre Valaris - SV1UY wrote:

Rich,

I'm glad that you and a couple of others have found the settings I
posted useful. On 10 - 17m I now use a 5m lockable steel measuring
tape. I went through the same procedure as before, noting down the
reading on the tape that gave best results. I didn't publish the
settings because I guess they might vary from one make of tape
measure to another.

Contrast this with the trouble I have had getting the MP-1 to work.
In view of the comments by others on this list that the MP-1 is the
best thing since sliced bread I have put in many more hours trying to
discover the secret but I have still not observed anything to suggest
it works more efficiently than the ATX in practice, and the best SWR
I can get on several bands is no better than 2.5:1.

Before anyone starts shouting at me for being obsessed with this SWR
issue let me share with you the results of some tests I did to
determine how the FT-817 reacts to high SWR.

On the 2.5W setting "L)))" the transceiver appears to put out the
full 2.5W regardless of SWR.

On the 5W setting full power is output up to three bars of SWR. As
soon as the fourth bar appears power is reduced by about 20%. When
the fifth bar appears power is reduced to about half.

So if you are running off the battery and accepting the default 2.5W
maximum power setting, and have a short co-ax feed, the SWR probably
doesn't matter very much and you can just tune by ear. On 5W however,
you should try to get 3 bars or less.

Julian, G4ILO
www.qsl.net/g4ilo

--- In FT817@y..., "Rich Casey (N5CSU)" <n5csu@y...> wrote:

After reading this newsgroup for quite a while, I ordered an ATX
last weekend from Great Britain. There was a knock at the door

Sunday

(!) afternoon- the postman delivering my ATX! I was heading over to
my YL's soon, so I grabbed my 817 (preprogrammed with loads of

freqs

via FTBasic), packed up everything into my $5 carrying case, and

took

it over to the YL's house. In her loft computer room, I plugged in

my

$3 power supply, and used a 90 degree connector to plug the ATX

into

the SO-239 on the back of the rig. I set out the whip length for 20
meters and the Radio Shack counterpoise length per Julian's
recommendations, and was happy to see a flat SWR.

I then checked into the Maritime Mobile Service Net freq (14.300)

on

first call. NCS at the time was in Alabama, I'm in Dallas. Later I
worked a Colo Springs ham on 20. Nicely built whip; will try it on
the other bands today.

Two points: the radio and antenna are loads of fun, and most, if

not

all, of the info I needed to make this work was received through

this

newsgroup. It is a GREAT resource for the 817 operator.

73
Rich/n5csu
Dallas TX

PS: Check the Bookmarks list on this newsgroup for all links to the
items mentioned in this e-mail.

Hi,

I have just got back from a week in a hotel in Belgium where I have been
testing my 40-30-20m portable loop antenna with the FT817.

Scattered in the 350 or so emails waiting for me from this reflector was a
discussion thread on loop antennas, so I thought I would add my
experiences...

My loop consists of 16 feet of hook up wire in a diamond shape. Across the
diagonal of the diamond is a spreader made from three 20 inch lengths of
dowel which are fitted together to give 60 inches by pieces of plastic
tubing made from old felt-tip pens. Incidentally, twenty inches was chosen
because it fits into my suitcase.

At the top of the loop is the suspension point, made from a piece of MDF
about 3 inches square. This also mounts a three position slide switch switch
and four bee-hive trimmers. The feedpoint, at the bottom of the loop,
consists of a toroidal transformer housed in a 35mm film canister. The
aerial is fed from a length of 50 Ohm coax cable terminated in a BNC
connector.

The three position switch selects a different capacitor for each band (I
found I needed two in parallel for resonance on 40). At first I tried
paralleling the capacitors to tune the lower bands, but the tuning became
too interactive, so I now use different capacitors for each band.

By adjusting the turns ratio on the toroidal transformer I have been able to
achieve 1:1 SWR on all bands.

The aerial worked surprisingly well in Belgium, so I decided to test it
further in the WPX contest over the weekend. I hung it from the light
fitting in the ground floor kitchen of my house and worked loads of stations
on 40 and 20. Best DX on 20m was NW7R in Arizona, easily 7000 miles from my
QTH in Oxford, England. On 40, I worked several Asiatic Russian stations.
All with 5 Watts from the FT817...

You may also be interested to know that the aerial was originally resonated
at the QRP frequencies for each band, but during the contest I worked the
entire CW section of each band without bothering to retune.

If there is an interest in the aerial, I would be happy to write it up
further.

Ray g4fon

Hello to all,

I just bought a FT817 yesterday, it great, I got it home, listened to some freq, then tackled the manual. I have two questions to ask the good persons on the group.

1. I'm having trouble to use the radio on 2 m FM, with some repeaters that I entered. I can't change the repeater shift. I'm following the manual, I believe. So far I have made a contact using the FT 817.

2. I bought some RS MiNh rechargable batteries. To use them and charge them in the radio, do I have to cut a wire. I have the Wall wart that goes with the FT 817. If I cut the wire, if I wanted to use another battery pack, will I still be able to do so.

I cheked the past postings, and I did not find anything that looked like it ould help me.

Regards,

John

--- In FT817@y..., "Brian Frobisher" <flingit@l...> wrote:

I paid the $25.00 and the $5.00 shipping.
Wanna know what I got?

BUGGY BETAWARE that does NOT work!

Yes, I got mine too. It is able to read the data from the radio, but when you try to send data back to the radio the program crashes every time. I've sent an e-mail to RT Systems tech support, but so far no response (although this could be because of the holiday...)

After reading this newsgroup for quite a while, I ordered an ATX
last weekend from Great Britain. There was a knock at the door Sunday
(!) afternoon- the postman delivering my ATX! I was heading over to
my YL's soon, so I grabbed my 817 (preprogrammed with loads of freqs
via FTBasic), packed up everything into my $5 carrying case, and took
it over to the YL's house. In her loft computer room, I plugged in my
$3 power supply, and used a 90 degree connector to plug the ATX into
the SO-239 on the back of the rig. I set out the whip length for 20
meters and the Radio Shack counterpoise length per Julian's
recommendations, and was happy to see a flat SWR.

I then checked into the Maritime Mobile Service Net freq (14.300) on
first call. NCS at the time was in Alabama, I'm in Dallas. Later I
worked a Colo Springs ham on 20. Nicely built whip; will try it on
the other bands today.

Two points: the radio and antenna are loads of fun, and most, if not
all, of the info I needed to make this work was received through this
newsgroup. It is a GREAT resource for the 817 operator.

73
Rich/n5csu
Dallas TX

PS: Check the Bookmarks list on this newsgroup for all links to the
items mentioned in this e-mail.

With regard to, no need for amps, last night I had my first opportunity to
operate my new FT-817 from aboard my boat (a 30 Ft Bayliner cruiser). Since
I don't have any HF antennas installed on there yet, I mounted a 20 meter
Maldol whip on the back of my Z11 tuner with a coax elbow and a BNC adaptor.
I set the tuner with the whip attached on top of the bridge (probably 6 or 7
feet above the water and draped an 11 foot radial over the captains chair
toward the stern letting the end just fall onto the fiberglass deck. Then I
went down into the cabin plugged FT-817 into a cigarette lighter jack (no
special wiring required for this little rig) to see if this would work at
all. As soon as I turned the power switch on, there was Dan, S52KA calling
CQ on 20 CW. Not really expecting him to hear me I answered his call and
much to my surprise and delight he came back and gave me a 579. I went on to
make several more DX contacts on 20 CW all of whom answered on the first
call. Yes there may be times when an amp would help but you aren't going to
just plug that into a cigarette lighter jack and what a thrill it is to do
it with 5 watts and a makeshift antenna!

---
73, Rich - W3ZJ

--- In FT817@y..., "Paul Gerhardt" <pgerhardt@h...> wrote:

Wow! This looks like THE amp for the '817' Full output from 2-30

mHz with

only .2watts of drive! Personally I like QRP fine but for those

of you

that MUST have an amp this looks like it would be GREAT!

Check it out at:

m

73, Paul K3PG
_________________________________________________________________
Get your FREE download of MSN Explorer at

Gee, I wonder, how long will it run from a 6 Ah gel-cel? Does it
include a charger? It looks like you could carry it on your bicycle...

I have experimented with a single short counterpoise of 6metres in
length which I have found works well with the ATX walkabout on all
bands from 6m to 20m.

Julian in his message number 6378 mentions the whip lengths he found
for best swr using severate radials for each band, I have found the
exact same whip lengths as Julian using my single counterpoise.

For 40m and 80m my counterpoise is too short, however on the end is a
small crocodile clip which I attached later to a nearby wire fence
and then the ATX tuned great on 40m as per Julians message and also
with 8 sections whip length required on 80m.

The 5 amp crocodile clip, 8 amp insulated wire and male and female
bullet connectors for the counterpoise were all purchased very
cheaply from a nearby high street car accessory shop. Using the
bullet connectors I only have about 2" of wire attached full time to
the back of the Ft-817.

Regards

Philip G0ISW

Well put Rick. Ay first I too was a little miffed. I wanted an exact
replica of the ft-817 on the screen. However, once I got over it I began to
enjoy the features I normally use.

is anyone using the tokyo hy-power HL-50B amp with the LDG Z-11 tuner? was
wondering what the output of the amp is before performing the attenuator
mods? i'd hate to fry the Z-11.
any info would be appreciated.

mike ac6ja

--- In FT817@y..., "Paul Gerhardt" <pgerhardt@h...> wrote:

Wow! This looks like THE amp for the '817'

Cool! I wonder if Target sells a bag to carry it? Also, do you
know if you can unsolder a jumper for full UHF/VHF TX?

7/3 =paul= w8kc