Date   

Re: 2021 NJQRP Skeeter Hunt Resuts

Mark WO7T
 

Thanks for all your effort Larry in publicizing and compiling.

Most appreciated!


Re: Inverted vee EFHW

Mlike McEwen
 

Excellent work...and good info...After a recent Dr visit I'm looking and some simple antenna options...

72/73 Doc K5OSA

On Mon, Aug 30, 2021, 7:48 PM Jim Long <jphiliplong@...> wrote:
I have the Par EFHW for 20, 30 and 40 and I got into Italy last week on 20mtrs CW with it.  It is about 10-12 feet above the ground.

Jim


Event: Wednesday Evening 40 and 80 meter Nets - 09/01/2021 #cal-reminder

main@4SQRP.groups.io Calendar <noreply@...>
 

Reminder: Wednesday Evening 40 and 80 meter Nets

When:
09/01/2021
20:00 to 21:00
(UTC-05:00) America/Chicago

Where:
40 and 80 Meters

Organizer: jomatlock@...

View Event

Description:
The 40 Meter Net will be at 8:00 pm central time (DST)  on 7.122 +-. QRM
NCS is WQ5RP/ACØBQ 

Wednesday evening 80 Meter CW Net. will be at  (8:30PM Central Time Wednesday (DST). 



The 80 meter net will be called on 3.564 MHz +/- QRM.
Net control operator is Johnny ACØBQ 

* NEW *  Wednesday evening DMR Voice Net will be at (Thursday) 02:00 UTC (9:00PM Central dst Time Wednesday/)
Four States QRP has a Brandmeister DMR Talk Group (TG31654). Join us to discuss QRP, ask questions, or just ragchew. The Wednesday net is a directed net  but any other time you may use the Talk Group to chat with other QRPers.
Net Control operator is Bert NØYJ.


Re: Inverted vee EFHW

Jim Long
 

I have the Par EFHW for 20, 30 and 40 and I got into Italy last week on 20mtrs CW with it.  It is about 10-12 feet above the ground.

Jim


Re: Inverted vee EFHW

Jim Upson
 

I am 95% portable….SOTA…..so my experience is based on being in nice quiet surroundings…..
Also, my “Par” EFHW from LNR precision (now Vibroplex) is the 40/20 EFHW…but I assume an EFHW is an EFHW liking similar set-ups ……
When on SOTA outings, I usually tie the ends to tree branches  around 4-6-feet above ground (easy reach)…

For backup plans, I have a guying kit for my hiking poles from SOTABEAMS and if I am at a local park or in my home yard with a temporary setup, I’ll use ~3-foot electric fence post (as I have no trees for tie-off points)….here are links:

https://www.amazon.com/dp/B002YIJTQC/ref=cm_sw_r_sms_api_glt_fabc_1W5NECDKV22YPBCVW9KX?psc=1

 

 

https://www.google.com/amp/s/www.sotabeams.co.uk/amp/walking-pole-guying-kit/

73, Jim / AC3B 


Re: Inverted vee EFHW

John - KK4ITX
 

I have a homebrew EFHW and find that 4ft above ground ends work for portable deployment quite well.  If set up as a sloper I have used both 20 & 33ft masts.

John
KK4ITX 

Visit:  www.zaarc.org.   👁

On Aug 30, 2021, at 18:07, Mlike McEwen <michael.t.mcewen@...> wrote:

Anyone using an EFHW Par 10.20.40 as an inverted vee? How high above ground for the ends is sufficient?

72/73 Doc K5OSA

--
John, KK4ITX       # 1603


2021 NJQRP Skeeter Hunt Resuts

Larry Makoski
 

The log summaries are in and the results have been tallied and the Scoreboard for the 2021 NJQRP Skeeter Hunt is ready for viewing : https://docs.google.com/spreadsheets/d/1-drxnlwD8qJtv0mcTaPzXWB-9tFrU11v/edit?usp=sharing&ouid=118035729102530956622&rtpof=true&sd=true

Congratulations are in order to:

N5GW - First Place Overall

AB9CA - Second Place Overall

NK9G - Third Place Overall

NK8Q - Fourth Place Overall

N0SS - Fifth Place Overall

And congratulations and thanks to all who participated - we had close to a 48% log submission rate which is fantastic - 121 out of 251 Skeeter sign ups. You are the ones who make this success that it is. See you again in 2022!

The Soapbox should be ready for viewing in a few weeks to be followed by certificates to those who qualified.

Larry W2LJ


Inverted vee EFHW

Mlike McEwen
 

Anyone using an EFHW Par 10.20.40 as an inverted vee? How high above ground for the ends is sufficient?

72/73 Doc K5OSA


Re: How to objectively qualify SSB transmission quality?

Shirley Dulcey KE1L
 

Frequency response of a filter won't tell you the entire story, though the worst offenders are well in the past (and good riddance). One reason that many SSB radios from the 60s and 70s sounded bad was because of time domain distortions in the filters, something that won't show up in any test with static signals like a two tone test. (They will show up if you test the phase response of the filter, another way of looking at the same phenomenon.) Another reason was intermodulation distortion; some types of that DO show in the two tone test, but there is also transient intermodulation distortion (TIM) that is only apparent with changing signals. Those flaws made radios sound bad in ways that people mostly didn't understand at the time and didn't show up in the tests in common use, but when high speed data modes came along they were exposed.

Many crystal lattice filters, the kind used on older radios that used crystals at different frequencies in specific relationships, were rather bad in the time domain. Ladder filters, the kind we see in most current designs, are better. DSP filters can combine excellent skirts and excellent time domain response, which is why a well implemented DSP can sound very good, rivaling the sound of a classic analog direct conversion receiver while also offering better filtering and all the modern operating conveniences. Those same lattice filters also turned out to limit the dynamic range of the receiver, though that wasn't important until we started approaching 100 dB DR in the rest of the circuit.

Not all of the classic radios sounded bad. The mechanical filters that Collins used and the LC filters in the classic Drake 4 line were both good, as was the crystal filter in most Swan radios. (The latter DID suffer from wider skirts than most competitors.) And they all had excellent tube audio stages with low distortion, better than most of the early solid state designs.

On Thu, Aug 26, 2021 at 11:10 PM Lee via groups.io <kx4tt=yahoo.com@groups.io> wrote:
Sweeping the filter will give you an idea of the filter characteristics and its quality; Curt definitely has one piece of the puzzle.

But - if you want to test the whole transmit chain (at least until the drive circuit), a two-tone test is an excellent way to visually determine SSB quality. You will need an oscilloscope for this. Here are two URLs describing the test.

https://www.w8ji.com/transmitters.htm

https://vk6ysf.com/ssb_2tone_test.htm

I've little doubt that there is an app that will get you two tone output from your cell phone or computer.

To do two-tone tests of the output, you will need a dummy load and a loop of wire around it to act as a pickup.

If you have access to a good spectrum analyzer, you can obtain even clear data. See the ARRL Lab Test Manual:

https://www.arrl.org/files/file/Technology/tis/info/pdf/Procedure%20Manual%202010%20with%20page%20breaks.pdf

Lee KX4TT
On Thursday, 26 August 2021, 05:50:43 pm GMT-4, Curt via groups.io <wb8yyy=yahoo.com@groups.io> wrote:


Geert

Relative to the filter, measure its response somehow. If you have a nanoVNA that will work. But since you have a rig, use audio software like spectogram to see the pass and just with received noise as the input. Of course you want a flat response from 300 to 2000 Hz or so. A cw filter like shape leads to distortion. Examine the filters designed for bitx, k2 and ubitx for examples. The transmit audio chain is also important. 

Curt


Re: How to objectively qualify SSB transmission quality?

Lee
 

Sweeping the filter will give you an idea of the filter characteristics and its quality; Curt definitely has one piece of the puzzle.

But - if you want to test the whole transmit chain (at least until the drive circuit), a two-tone test is an excellent way to visually determine SSB quality. You will need an oscilloscope for this. Here are two URLs describing the test.

https://www.w8ji.com/transmitters.htm

https://vk6ysf.com/ssb_2tone_test.htm

I've little doubt that there is an app that will get you two tone output from your cell phone or computer.

To do two-tone tests of the output, you will need a dummy load and a loop of wire around it to act as a pickup.

If you have access to a good spectrum analyzer, you can obtain even clear data. See the ARRL Lab Test Manual:

https://www.arrl.org/files/file/Technology/tis/info/pdf/Procedure%20Manual%202010%20with%20page%20breaks.pdf

Lee KX4TT

On Thursday, 26 August 2021, 05:50:43 pm GMT-4, Curt via groups.io <wb8yyy@...> wrote:


Geert

Relative to the filter, measure its response somehow. If you have a nanoVNA that will work. But since you have a rig, use audio software like spectogram to see the pass and just with received noise as the input. Of course you want a flat response from 300 to 2000 Hz or so. A cw filter like shape leads to distortion. Examine the filters designed for bitx, k2 and ubitx for examples. The transmit audio chain is also important. 

Curt


Re: How to objectively qualify SSB transmission quality?

Curt
 

Geert

Relative to the filter, measure its response somehow. If you have a nanoVNA that will work. But since you have a rig, use audio software like spectogram to see the pass and just with received noise as the input. Of course you want a flat response from 300 to 2000 Hz or so. A cw filter like shape leads to distortion. Examine the filters designed for bitx, k2 and ubitx for examples. The transmit audio chain is also important. 

Curt


How to objectively qualify SSB transmission quality?

Geert Jan de Groot
 

(Before creating this posting, I carefully checked the guidelines and thing this falls under "QRP techniques". If not, I hope the moderators will mercifully point me to the error of my ways..)

There is a lot of QRP construction happening in this community, perhaps I can ask:

When qualifying a transmitter doing FM, there are a few tricks:
  • Check the audio passband: 300-3000 Hz
  • Check the clipping behavior with too much modulation signal, check for audio harmonics (another passband check)
  • Use a square wave as modulation, so one can check frequency and phase relations (after all, a square wave is nothing but 1*f + 1/3*3f + 1/5*5f)
Using this, I've made several radios that had "good modulation". In FM.

However, I am struggling with SSB transmitters. In my experiments, like in many QRP rigs, I use a "crystal ladder" (crystals in series, capacitors to ground). They beat the price, size and weight of a KVG XF-9B filter, but the passband is not flat, and I think it is one of the reasons the comments I get on my SSB modulation are not cheerful.
Like with FM sketched above, I would like to objectively qualify so I can measure and optimize instead of asking "how do I sound now?"
But the square wave trick obviously won't work.

How do "other people do this"?

73,

Geert Jan PE1HZG


Re: Small QRP SSB?

ab3eo
 

You missed an "i" https://www.venus-itech.com/

On 08/26/2021 2:40 PM Thomas Martin <tem494@...> wrote:
 
 
The DR 4020 if you look closely at the front is from Venus-tech you can go to www.venus-tech.com the have several types of radios listed. They are out of the DR4020.

On Thu, Aug 26, 2021 at 9:24 AM James Shipley < jamesshipley@...> wrote:

On Thu, Aug 26, 2021 at 8:51 AM Lee via groups.io <kx4tt= yahoo.com@groups.io> wrote:
I have the MFJ SSB 20m rig (MFJ-9420). It is a nice little single band rig with very crisp and clean audio. No artifacts or digital noise because it is all analog. I can recommend the design.

Lee KX4TT
On Thursday, 26 August 2021, 01:26:49 am GMT-4, Shirley Dulcey KE1L < mark@...> wrote:
 
 
The only single band one for 40 meters that I know of that is available new right now is the MFJ-9440. Each model is a bit over $300 (prices vary by band for some reason), which feels like a lot to me for what you get.
 
Single band SSB rigs for 40 that have been available in the fairly recent past include the Bitx 40, Easy Bitx (returning soon in an updated version), and Pacific Antenna MMR-40.
 
Multiband rigs that can do SSB that are currently available include the Elecraft KX2 and KX3, Xiegu G90, X5105, and G1M, Radioddity QR20, Icom IC-705, Yaesu FT-818, uBITX, and more. The G1M and uBITX qualify as inexpensive (in the $200-$300 range).
 
If you are feeling adventurous, there are also some kits from Russia and China.

On Wed, Aug 25, 2021 at 8:42 PM Mlike McEwen < michael.t.mcewen@...> wrote:
What would be a good small light weight SSB xcvr for pedestrian mobile...only 40 M is needed...low price is desirable...this is for my hiking pack...I have an antenna. 
 
72 K5OSA

 

 

 

 

 

 


Re: Small QRP SSB?

ab3eo
 

I have the 6M version. Not HF, still a nice little radio, made quite a few contacts with it.
 
Rich - K3UJ

On 08/26/2021 9:00 AM Mike Polia via groups.io <ab1aw@...> wrote:
 
 
 
I have the 75M version of the MFJ. 
 
Very nice rig. 
 
You can read my review of it at EHAM:
 
Mike
AB1AW
 
 
On Thursday, August 26, 2021, 08:51:23 AM EDT, Lee via groups.io <kx4tt@...> wrote:
 
 
I have the MFJ SSB 20m rig (MFJ-9420). It is a nice little single band rig with very crisp and clean audio. No artifacts or digital noise because it is all analog. I can recommend the design.

Lee KX4TT
On Thursday, 26 August 2021, 01:26:49 am GMT-4, Shirley Dulcey KE1L <mark@...> wrote:
 
 
The only single band one for 40 meters that I know of that is available new right now is the MFJ-9440. Each model is a bit over $300 (prices vary by band for some reason), which feels like a lot to me for what you get.
 
Single band SSB rigs for 40 that have been available in the fairly recent past include the Bitx 40, Easy Bitx (returning soon in an updated version), and Pacific Antenna MMR-40.
 
Multiband rigs that can do SSB that are currently available include the Elecraft KX2 and KX3, Xiegu G90, X5105, and G1M, Radioddity QR20, Icom IC-705, Yaesu FT-818, uBITX, and more. The G1M and uBITX qualify as inexpensive (in the $200-$300 range).
 
If you are feeling adventurous, there are also some kits from Russia and China.

On Wed, Aug 25, 2021 at 8:42 PM Mlike McEwen < michael.t.mcewen@...> wrote:
What would be a good small light weight SSB xcvr for pedestrian mobile...only 40 M is needed...low price is desirable...this is for my hiking pack...I have an antenna. 
 
72 K5OSA

 

 


Re: 40 AND 80 Meter Net Report

KG5ZID Hardy
 

I heard the digi on 40 and tuned up but didn't hear a peep. Nothing on 80 either. Will try again next week!


Re: Small QRP SSB?

Derek Burrage
 

I looked at this on the OZQRP website, and found they now have a more capable, but larger DCT, which adds CW. However, both are direct conversion, Double Side Band (presumably suppressed carrier, but not SSB), so I doubt they would fit the requirements (the DCT at least can receive AM apparently). I recently build a Nouveau75a for AM and have heard some nets in the Mid-west, and apparently it is common in the North East, but I was intrigued that DSB might also be commonly used, at least in the Australian/NewZealand region. Anyone know if DSB-SC is used in the US? de Derek KF5CYN


Re: Small QRP SSB?

Thomas Martin
 

The DR 4020 if you look closely at the front is from Venus-tech you can go to www.venus-tech.com the have several types of radios listed. They are out of the DR4020.

On Thu, Aug 26, 2021 at 9:24 AM James Shipley <jamesshipley@...> wrote:

On Thu, Aug 26, 2021 at 8:51 AM Lee via groups.io <kx4tt=yahoo.com@groups.io> wrote:
I have the MFJ SSB 20m rig (MFJ-9420). It is a nice little single band rig with very crisp and clean audio. No artifacts or digital noise because it is all analog. I can recommend the design.

Lee KX4TT
On Thursday, 26 August 2021, 01:26:49 am GMT-4, Shirley Dulcey KE1L <mark@...> wrote:


The only single band one for 40 meters that I know of that is available new right now is the MFJ-9440. Each model is a bit over $300 (prices vary by band for some reason), which feels like a lot to me for what you get.

Single band SSB rigs for 40 that have been available in the fairly recent past include the Bitx 40, Easy Bitx (returning soon in an updated version), and Pacific Antenna MMR-40.

Multiband rigs that can do SSB that are currently available include the Elecraft KX2 and KX3, Xiegu G90, X5105, and G1M, Radioddity QR20, Icom IC-705, Yaesu FT-818, uBITX, and more. The G1M and uBITX qualify as inexpensive (in the $200-$300 range).

If you are feeling adventurous, there are also some kits from Russia and China.

On Wed, Aug 25, 2021 at 8:42 PM Mlike McEwen <michael.t.mcewen@...> wrote:
What would be a good small light weight SSB xcvr for pedestrian mobile...only 40 M is needed...low price is desirable...this is for my hiking pack...I have an antenna. 

72 K5OSA


Re: Small QRP SSB?

Matthew Halsey
 

I can highly recommend the G90.  While my main mode is CW, I occasionally go on SSB and always get positive remarks on the audio quality and get through pileups surprisingly easily with 20W.
You also get ALL HF bands and built in tuner for your money.

Matt
KC3OIV
 

On Aug 26, 2021, at 9:00 AM, Mike Polia via groups.io <ab1aw@...> wrote:

I have the 75M version of the MFJ. 

Very nice rig. 

You can read my review of it at EHAM:

Mike
AB1AW


On Thursday, August 26, 2021, 08:51:23 AM EDT, Lee via groups.io <kx4tt@...> wrote:


I have the MFJ SSB 20m rig (MFJ-9420). It is a nice little single band rig with very crisp and clean audio. No artifacts or digital noise because it is all analog. I can recommend the design.

Lee KX4TT
On Thursday, 26 August 2021, 01:26:49 am GMT-4, Shirley Dulcey KE1L <mark@...> wrote:


The only single band one for 40 meters that I know of that is available new right now is the MFJ-9440. Each model is a bit over $300 (prices vary by band for some reason), which feels like a lot to me for what you get.

Single band SSB rigs for 40 that have been available in the fairly recent past include the Bitx 40, Easy Bitx (returning soon in an updated version), and Pacific Antenna MMR-40.

Multiband rigs that can do SSB that are currently available include the Elecraft KX2 and KX3, Xiegu G90, X5105, and G1M, Radioddity QR20, Icom IC-705, Yaesu FT-818, uBITX, and more. The G1M and uBITX qualify as inexpensive (in the $200-$300 range).

If you are feeling adventurous, there are also some kits from Russia and China.

On Wed, Aug 25, 2021 at 8:42 PM Mlike McEwen <michael.t.mcewen@...> wrote:
What would be a good small light weight SSB xcvr for pedestrian mobile...only 40 M is needed...low price is desirable...this is for my hiking pack...I have an antenna. 

72 K5OSA




Re: Small QRP SSB?

Mike Polia
 

I have the 75M version of the MFJ. 

Very nice rig. 

You can read my review of it at EHAM:

Mike
AB1AW


On Thursday, August 26, 2021, 08:51:23 AM EDT, Lee via groups.io <kx4tt@...> wrote:


I have the MFJ SSB 20m rig (MFJ-9420). It is a nice little single band rig with very crisp and clean audio. No artifacts or digital noise because it is all analog. I can recommend the design.

Lee KX4TT
On Thursday, 26 August 2021, 01:26:49 am GMT-4, Shirley Dulcey KE1L <mark@...> wrote:


The only single band one for 40 meters that I know of that is available new right now is the MFJ-9440. Each model is a bit over $300 (prices vary by band for some reason), which feels like a lot to me for what you get.

Single band SSB rigs for 40 that have been available in the fairly recent past include the Bitx 40, Easy Bitx (returning soon in an updated version), and Pacific Antenna MMR-40.

Multiband rigs that can do SSB that are currently available include the Elecraft KX2 and KX3, Xiegu G90, X5105, and G1M, Radioddity QR20, Icom IC-705, Yaesu FT-818, uBITX, and more. The G1M and uBITX qualify as inexpensive (in the $200-$300 range).

If you are feeling adventurous, there are also some kits from Russia and China.

On Wed, Aug 25, 2021 at 8:42 PM Mlike McEwen <michael.t.mcewen@...> wrote:
What would be a good small light weight SSB xcvr for pedestrian mobile...only 40 M is needed...low price is desirable...this is for my hiking pack...I have an antenna. 

72 K5OSA


Re: 40 AND 80 Meter Net Report

n4mj
 

I did almost the same thing Chas.  Just twisting the knob up/down and there was Johnny o/a 7.1226.  I heard you and Paul, WA9PWP, on 7.122 earlier. Paul was fair copy most of the time but that digi kept messing up his signal.  Believe I sent HI to you while waiting/looking for Johnny. hi hi
73 de n4mj//glenn


 
PLEASE REMOVE all email addresses before you send it on and use BCC option when forwarding"
  Thank you! 



On Thursday, August 26, 2021, 11:17:00 AM CDT, <w2sh@...> wrote:


I was getting ready to shut down the rig after making briefly announcing my presence, along with WA9PWP and N4MJ, on 7,122.04 kHz.  I accidently touched the tuning knob and found Johnny on 7,122.65, where he was 569, louder than when he first opened up at the usual freq lower down.  So I got to be his first 40m QSO.

72,

Charles (aka Chas), W2SH 



From: main@4SQRP.groups.io <main@4SQRP.groups.io> on behalf of Johnny AC0BQ <jomatlock@...>
Sent: Wednesday, August 25, 2021 21:51
To: 4sqrpio <4SQRP@groups.io>
Subject: [4SQRP] 40 AND 80 Meter Net Report
 
Ge Group
I'm sorry but I had to qsy up to 122.5 tonight.
I had some qrn, possibly digital, locked in right on top of me.

The check in's are
40 METERS
W2SH CHAS
N4MJ GLENN
KD9GDY JAMES, Sorry for the mix up on your call.
WI5H MIKE
WD4CFN MIKE
W5ESE SCOTT

80 METERS
N0YJ BERT
KL7IXI MIKE
My qrn level was a s-5 so It was wiping out most of the signals
I think.
You all have a good week, stay Cool, It's hot in the Midwest.
72
Johnny AC0BQ


--

72
JOHNNY AC0BQ  ..



--
Charles Moizeau, W2SH

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