Date   

Re: Your opinions please

Walter - K5EST
 

GM Wayne, you have an interesting thought! My first thought is 2-3 watts on 2 meters is ok but not enough to invest money to the addition unless an all mode amplifier is part of the new install.

I had my FT-817 on 2 meters SSB and CW running 5 watts. Well, contacts were made but the QSOs were selective and the other stations were using beams to my 2 meter Halo loop. If I was going to do it again then building a beam would be a priority but winter time ice/snow kept me from a rotator and beam.

73....Walter - K5EST

On Thu, Oct 5, 2017 at 7:05 AM, Wayne Dillon wayne.dillon@... [4sqrp] <4sqrp@...> wrote:
 

Good morning all,
I'm about to pull the trigger on a VHF Board for my KX3. I know there are those here that have done this to their kX3s, what I'd like to have is your opinion as to whether it was wort it. My KX3 is already fully loaded (except the paddle which I just couldn't get along with) and I'd like the VHF option, I think.
OK folks, over to you for your comments/opinions....
Be blessed all es 72/3 de Wayne - NQ0RP

--
 
QRP -  EFFICIENCY AND SKILL, NOT POWER. 
 
God Bless from Wayne Dillon - NQ0RP




Re: Your opinions please

Jim Sheldon
 

If you built your KX3 from the kit Wayne, the VHF board should be no problem.  It IS a tiny bit tricky to install, but they have had a couple of years to refine the instructions so even that shouldn't be too daunting.  I don't have my KX3 any more, but having built it originally and also having done the 2 meter install myself, if my fat fingers can do it, I'd bet you can too.  It IS worth it for the SSB capability on 2 meters, but for anything but emergencies, the FM portion is better served by a cheap Chinese throwaway HT which is far easier to set up and use.  

Also, the KX3's nominal output on HF-6 meters is 10-12 watts depending on supply voltage, the output on the 2 meter internal transverter is only about 2.5-3 watts MAX so you should take that into consideration in your decision as well.

73,
Jim -  W0EB

------ Original Message ------
From: "Wayne Dillon wayne.dillon@... [4sqrp]" <4sqrp@...>
To: "4sqrp@..." <4sqrp@...>
Sent: 10/5/2017 7:05:15 AM
Subject: [4sqrp] Your opinions please

Good morning all,
I'm about to pull the trigger on a VHF Board for my KX3. I know there are those here that have done this to their kX3s, what I'd like to have is your opinion as to whether it was wort it. My KX3 is already fully loaded (except the paddle which I just couldn't get along with) and I'd like the VHF option, I think.
OK folks, over to you for your comments/opinions....
Be blessed all es 72/3 de Wayne - NQ0RP

--
 
QRP -  EFFICIENCY AND SKILL, NOT POWER. 
 
God Bless from Wayne Dillon - NQ0RP



Your opinions please

Wayne Dillon
 

Good morning all,
I'm about to pull the trigger on a VHF Board for my KX3. I know there are those here that have done this to their kX3s, what I'd like to have is your opinion as to whether it was wort it. My KX3 is already fully loaded (except the paddle which I just couldn't get along with) and I'd like the VHF option, I think.
OK folks, over to you for your comments/opinions....
Be blessed all es 72/3 de Wayne - NQ0RP

--
 
QRP -  EFFICIENCY AND SKILL, NOT POWER. 
 
God Bless from Wayne Dillon - NQ0RP



Re: "FM Snake" Project

Jim Sheldon
 

Read it a bit closer Tom. He says you could use a single wire below the diodes but he made the whole thing from zipcord and rather than waste the wire he used it.

W0EB

On Oct 4, 2017, at 8:34 PM, Tom Sevart tmsevart@gmail.com [4sqrp] <4sqrp@yahoogroups.com> wrote:

On 10/04/17 19:19, Joe E cornhusker@yahoo.com [4sqrp] wrote:


They are different lengths to take in consideration the variance in
wavelength from the top to the bottom of the FM broadcast band..it is 20
MHz wide. :)
No, the wires below the diodes are the same length. From the text:
"The wires below the two diodes should be about 122.5 centimeters long
(48¼"). " I say you don't need two wires when they're both connected at
the same point, but having two different length wires might work sort of
like a fan dipole works, but with something like this as a near field
receiver I don't think it's that critical.

--
Tom Sevart N2UHC
St. Paul, KS

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------------------------------------
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------------------------------------

4SQRP Website: http://4sqrp.com
Plan to attend OzarkCon on - April 6-7, 2018
View Details at http://www.ozarkcon.com/index.php
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Yahoo Groups Links



Re: "FM Snake" Project

Tom Sevart
 

On 10/04/17 19:19, Joe E cornhusker@yahoo.com [4sqrp] wrote:


They are different lengths to take in consideration the variance in
wavelength from the top to the bottom of the FM broadcast band..it is 20
MHz wide. :)
No, the wires below the diodes are the same length. From the text: "The wires below the two diodes should be about 122.5 centimeters long (48¼"). " I say you don't need two wires when they're both connected at the same point, but having two different length wires might work sort of like a fan dipole works, but with something like this as a near field receiver I don't think it's that critical.

--
Tom Sevart N2UHC
St. Paul, KS


Re: "FM Snake" Project

cornhusker
 

They are different lengths to take in consideration the variance in wavelength from the top to the bottom of the FM broadcast band..it is 20 MHz wide.    :)

73 de K0NEB

On ‎Wednesday‎, ‎October‎ ‎04‎, ‎2017‎ ‎06‎:‎40‎:‎12‎ ‎PM, Tom Sevart tmsevart@... [4sqrp] <4sqrp@...> wrote:


 

On 10/03/17 15:51, Tommy Gober tommy@... [4sqrp] wrote:
>
>
> I recently came across this article about building an FM broadcast RF
> sniffer called an "FM Snake". It's not QRP related, per se, but still an
> interesting simple little circuit for playing around with if you live
> near an FM broadcast facility.
>
> http://www.ericbrasseur.org/electrosmog_snake.html
>
> Tommy, N5DUX

Interesting. I don't know why the design has two wires below the diodes
since they're wired together in parallel. I'd think just one wire below
the diodes would be sufficient, since that part is basically acting as
an antenna.

--
Tom Sevart N2UHC
St. Paul, KS

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475 KHZ Circuits

gary rheuark <garyk5qnm@...>
 

Hello to everyone. When the subject of 630 meters came up a year ago, I downloaded all information that I could find..
The information came mainly from GW3UEP's website. Not knowing the FCC's ultimate power level
restrictions, I settled on the GW3UEP 100 watt circuits that would run at least 25 watts on 12 VDC at 3 amps.

I laid out a PCB for a full 100 mW exciter with an on board low pass filter and this resulted in a complete
harmonic free CW transmitter. The circuit is the HCF4060 circuit using an HC49 tall crystal. The first problem
encountered was it would not key the carrier on or off. I later found out that the key jack feed-thrus were bad
and did not to go from the top traces to the bottom traces. I shorted the key jack with some 20 guage wire and
there was an immediate signal on 7.600 MHZ and miraculously a signal also on 475.000 KHZ. Right in the middle
of the band and loud.

Having a source of 475 KHZ, I laid out a PCB for the "100 Watt Power Amplifier" that iw was wanting to use as a
25 watt power amp on 12 VDC using the largest PCB heat sink I could find. I used an IRF640 FET that I had a
bunch of and then got in to the problem of finding the parts that GW3UEP recommended the brands on and
bought parts and boards for 6 power amplifiers. I assembled 5 boards and set up a test fixture that would hold
the oscillator, the power amplifier and a "50 watt" low pass filter and began testing the power amps.

My watt meter showed an immediate 30 watts output, so I started a a 1 minute key down heating test and noticed
a very slight 1 or 2 watts of loss in power. Powering down, I found that my frequency tuning caps were very hot and
the heat sink was showing some warm to the touch.

I sat down and did a circuit analysis for FET specs, frequency calculations and so forth. No problems found. I then
went to impedance transformations and found that the circuit was basically transforming the low FET impedance
up to the basic 50 ohms going to the output filter.

Doing a deeper investigation into the capacitor specs, I found a problem area. It seems that capacitors have some
frequency limitations and current limitations. The caps were mathematically the correct capacitance and were the wrong
frequency and current values. The caps were limited to 25 watts and I was running 30 watts. This, with 100 vdc caps
running on 12 vdc. I had to go to 1000 vdc capacitors to get the heating down.

Now that the circuit was behaving better, the tuned inductance did not like 3.5 amps through it on a 4.0 amp rating.
4 out of the 5 power amplifiers put out over 25 watts and the 5th only put out just over 20 watts.

After all this amplifier testing, I checked the Low Pass filter for heating.  I had designed the filter for 100 watts
of burn-up power and at 25 or 30 watts the series inductors were okay warm to the touch. All 6 filters checked okay.

Now for the bad news. Back to the exciter board. I took the original PCB board and edited off the low pass filter and
to cut the cost of the required exciter board. I ordered a sack of 7.600 MHZ crystals from e-bay and ordered boards.
The boards and parts came in and I built the first of the revision exciter and powered it up. No output. Nothing on
7.600 MHZ. It had power and key down.

Basic troubleshooting revealed nothing, so, I went to absolute basics on the circuit. The only difference I could find
was that the working exciter had a "TALL" HC-49 crystal and the bad exciter had a "SHORT" HC-49 crystal.

What the difference was is that the tall crystal had an ESR of 30 ohms and the short crystal had an ESR of 40 ohms.
I put in a tall crystal and got signals. I do need to get the e-bay crystals to work. The HFC4060 does not like an
ESR of 40 ohms in GW3UEP's circuits.

Don, AE5K and I have had discussions as to what constitutes an SDR receiver.

I am of the opinion that an SDR receiver consists of a product detector with an audio output with a channel separation
of 90 degrees for digital processing purposes. The I and the Q channels can be restructured to where only one channel
is providing audio down both channels and the digital processing will still work.

I then sat down and designed my own SDR receiver circuit. The circuit consists of a low pass filter feeding a 2N3904
RF preamp. I used a 2N3904 as a 460 KHZ oscillator. I fed both of these signals to a 2N3904 product detector. I fed this
output audio signal to a 2N3904 audio amplifier to get a larger signal 0 KHZ to 24 KHZ. Mono audio. I was wanting a ten
dollar SDR receiver that used a 1904 computer program named ARGO. I ran out of parts for the moment.So, the SDR
receivers are held up a bit.

For antenna, I wanted an antenna that one person could carry and set up, be about 10 foot tall and maybe 30 foot long.
This pretty much describes a heavily loaded dipole. I did the math and found out that if I loaded one of the dipole
elements I could use 2 inductors per element made out of plastic Folgers coffee cans. 4 cans total. To calculate the
inductance and number of turns, you have to know the wire diameter and any plastic insulation and the total wire
diameter.

I have pretty much documented everything from thoughts, to design, to boards and printing everything.

If any of this stack of information can be a help and I will put together a basic PDF file of pictures and circuits and some
of the math to get all this to work.....Gary.....K5QNM.....EM36.









Re: "FM Snake" Project

Tom Sevart
 

On 10/03/17 15:51, Tommy Gober tommy@neodux.com [4sqrp] wrote:


I recently came across this article about building an FM broadcast RF
sniffer called an "FM Snake". It's not QRP related, per se, but still an
interesting simple little circuit for playing around with if you live
near an FM broadcast facility.

http://www.ericbrasseur.org/electrosmog_snake.html

Tommy, N5DUX
Interesting. I don't know why the design has two wires below the diodes since they're wired together in parallel. I'd think just one wire below the diodes would be sufficient, since that part is basically acting as an antenna.


--
Tom Sevart N2UHC
St. Paul, KS


Re: enclosure

John Hucke <johnhucke87@...>
 

Bear,
QRP tunes? Attempts to Google yields QRP Tuner only?

On Wednesday, October 4, 2017, 12:35, beargyrils@... [4sqrp] <4sqrp@...> wrote:

 

Been reading the thread on QRP tunes. I have been using the UN-end-fed with my h HB1B and it seems to do very well. I'm in the hospital and have the wire hanging out of the 4th floor window and worked from NJ to FL. Also had good luck with a PFR-3 with the built in tuner. Just gotta love CW QRP and the small radios:-) BOB AF2DX
Sent from my Verizon Wireless BlackBerry


enclosure

 

Been reading the thread on QRP tunes. I have been using the UN-end-fed with my h HB1B and it seems to do very well. I'm in the hospital and have the wire hanging out of the 4th floor window and worked from NJ to FL. Also had good luck with a PFR-3 with the built in tuner. Just gotta love CW QRP and the small radios:-) BOB AF2DX
Sent from my Verizon Wireless BlackBerry


enclosure

perleyu@...
 

Hello, sorry to bother you. I can't remember if I ordered one of your small (blue) enclosure kits or not.  I clicked on the email address link, but my browser won't take me there.  Thanks  Perley, N1YUK


4SQRP Enclosures

Jim Sheldon
 

Hey, anybody got a "Little Blue Box" (small enclosure) that they haven't
built yet that would trade me for one already built? Reason I'm asking
- I know some have ordered that little QCX CW transceiver from QRP Labs
$49 USD. I have one on order but it's a pretty high number (#943) and
though their websites reports #506 was shipped as of yesterday, it's
going to be a while yet before I get mine.

I've been doing some measuring using the dimensions for the board they
show in their assembly instructions and have determined that it WILL,
fit in the little blue box. The tricky part comes in cutting the window
for the LCD which I plan to mount off the board as well as the switches,
jacks & controls.

I have a desktop milling machine and can machine the window very easily
if the material can be laid flat. With the box already constructed,
it's almost impossible to get back apart and it IS impossible to secure
the completed box in the operating area of my milling machine for
accurate cutting.

Just thought I'd see if someone has an unbuilt one they'd trade before
ordering a new one. I'd like to get the box prepped for the arrival of
the QCX so it doesn't take so long to complete once the kit gets here.

Jim - W0EB


Re: That New QRP Challenge : )

John Raynsford
 

 Greetings to all.
I've been listening to both 630m, 2200m and throughout the vlf and lf spectrum.
Using a Palomar Engineers VLF converter to the 80 mtr band. Very interesting
propagation modes down there & antenna options.
 Some links with plenty of worthwhile reading material:

KB5NJD

How to . . .

 
And

VE7SL

Had an interesting evening hr on 17mtrs cw today, worked N7ET/DU7 Dale
using 2 watts to a longwire on 18078 khz just prior to sunset. Fun !

72/73 to all.
AL7JK, John
Eagle River, Ak
4sqrp # 1210


On Tuesday, October 3, 2017 6:26 PM, "William Wood ke9xq@... [4sqrp]" <4sqrp@...> wrote:


 
I heard of one gent that used
a 100 Watt mobile audio amplifier 
to feed his antenna : )  Do not know
the configuration, but it sounds
simple enough : )
73 fer now
Bill  KE9XQ 



On Oct 3, 2017, at 5:45 PM, wb8yyy@... [4sqrp] <4sqrp@...> wrote:

Its a transmitter only, but QRP labs Ultimate 3S can be configured for the lower bands. It can do wspr, qrs cw or cw, all without a pc. It could be used to excite a PA, or integrated with a receiver.  

While the traditional 5 watts and less works well at HF, at LF QRP may be whatever the legal limit is.

Curt 



Re: That New QRP Challenge : )

Bill Wood
 

I heard of one gent that used
a 100 Watt mobile audio amplifier 
to feed his antenna : )  Do not know
the configuration, but it sounds
simple enough : )
73 fer now
Bill  KE9XQ 



On Oct 3, 2017, at 5:45 PM, wb8yyy@... [4sqrp] <4sqrp@...> wrote:

Its a transmitter only, but QRP labs Ultimate 3S can be configured for the lower bands. It can do wspr, qrs cw or cw, all without a pc. It could be used to excite a PA, or integrated with a receiver.  

While the traditional 5 watts and less works well at HF, at LF QRP may be whatever the legal limit is.

Curt 


Nets

WA0ITP
 

Ge all.

Just wondering if anyone is planning to be the Wednesday night NCS, and maybe the Thursday morning NCS.  Both Wayne NQ0RP,  and myself enjoyed that experience for many years, now it's time for someone else to carry on.  Both 80 and 40 are good bands for the nets, with each displaying good propagation in the 4SQRP area.

Is an easy and enjoyable service to the club.  We both have used N3FJP logging programs and can supply plenty of help for logging, loading buffers, etc.  Scott's programs are very easy and intuitive to use, so logging and running the net's is also easy and intuitive.

Who will step up to the keyer and take over?  Pse let me know and a telephone call will get you on your way.

I thank you and the club thanks you.


 
-- 
72 WAØITP
I love this radio stuff.
www.wa0itp.com
www.4sqrp.com


Re: QRP is challenged

Bill Cromwell
 

Thanks Lee,

..for the info. I have vague recall about reports I read or heard from radio ops who were at sea in the early 1900s. They may not have had that much power but still made it a long way - at least at night. I know the Navy and others had much more available later. How many hundreds of pounds of gear in racks? Those old tales also pointed out the nice salt water ground plane.

73,

Bill KU8H

On 10/03/2017 11:48 AM, 'KX4TT' kx4tt@yahoo.com [4sqrp] wrote:


Our Mackay rack (Model 2012 Main Tx IIRC) runs about 800-1000 watts on
MF (425, 454, 468, 480, 500, 512 khz) – two 813s in the finals – into a
fixed doublet running the spine of the ship. Lots of steel and a salt
water ground really help. Range after sundown is a couple of thousand
miles reliably………….the 2017 emergency rig is about 70 watts and is solid
state…………



73 de Lee KX4TT, General Radiotelegraph License (ex T2 holder)

RO, SS American Victory, QTH Tampa, FL



VA
--
bark less - wag more


Re: QRP is challenged

Dale Putnam
 

That new band.. is not that far from the "sub freqs" that have been used in the past..   

and one of their land stations used a buried antenna..    makes  one wonder... hmmmmm?



Have a great day,
--... ...-- Dale - WC7S in Wy

"Actions speak louder than words"
1856 - Abraham Lincoln



From: 4sqrp@... <4sqrp@...> on behalf of Tom Sevart tmsevart@... [4sqrp] <4sqrp@...>
Sent: Tuesday, October 3, 2017 6:03 PM
To: 4sqrp@...
Subject: Re: [4sqrp] QRP is challenged
 
 

On 10/03/17 08:07, Walter - K5EST walter.k5est@... [4sqrp] wrote:
>
>
> For a few minutes the reading about the new 630 meter Ham band had my
> antenna juices going.......until I actually did the old time 468/fMHz
> calculation! Yikes......991.5 feets for a dipole at 472KHz. Since I buy
> wire by the quarter mile and terra firma is plenty, no problem, right?!?

Building a dipole that long isn't the problem. The problem is getting
it up 1/4 wave above ground.

--
Tom Sevart N2UHC
St. Paul, KS

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Re: Special anniversary

Ed Redwine
 

I remember listening to Sputnik on my SX-99 as it passed over my QTH.

On Oct 3, 2017 7:12 PM, "Norm Lee marjannorm@... [4sqrp]" <4sqrp@...> wrote:
 

Just to let you all know, if you didn't already, that today - Wednesday, 4 October - is the 60th anniversary of the launch of Sputnik 1. We've come a looooong way since then. Maybe.
Cheers
Norm vk5gi
McLaren Vale
South Australia

Sent from my iPad


Special anniversary

marjannorm
 

Just to let you all know, if you didn't already, that today - Wednesday, 4 October - is the 60th anniversary of the launch of Sputnik 1. We've come a looooong way since then. Maybe.
Cheers
Norm vk5gi
McLaren Vale
South Australia

Sent from my iPad


Re: QRP is challenged

Tom Sevart
 

On 10/03/17 08:07, Walter - K5EST walter.k5est@gmail.com [4sqrp] wrote:


For a few minutes the reading about the new 630 meter Ham band had my
antenna juices going.......until I actually did the old time 468/fMHz
calculation! Yikes......991.5 feets for a dipole at 472KHz. Since I buy
wire by the quarter mile and terra firma is plenty, no problem, right?!?
Building a dipole that long isn't the problem. The problem is getting it up 1/4 wave above ground.

--
Tom Sevart N2UHC
St. Paul, KS

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