K5CM SUMMER FMT Aug 13/14  2020 UTC      (Thursday in North America)

Comments 

Call

Section

Grid

Comments

AA6LK

SV

CM98kw

Tnx Connie for running the test. Solid signal on late 20m run; lot of slop on 40/80m. 73, L-

AB2UW

NLI

FN30lu

Didn't see a difference between 20m at 1830Z & 0100Z. Lots of 'spread' on the 80m signal in SpectrumLab; may be tough to get the correct frequency. Thanks for this summer FMT!

AC6SL

SCV

CM87wd

40m reception was poor

AF9A

IN

EM69wv

20m signals in the afternoon were S9 but the west had more QSB so I used the east. 20m in the evening was only about S5. 40m was S9+30, 80m S9+20. Thanks for doing this, Connie !

K5RKS

OK

EM15

At least one run on each band was solid copy here in Okla City 73 Roger

K6BZZ

AZ

DM33xb

Thunderbolt, HP3336, IC-7300 Duplicate frequency method

K6FOD

LAX

DM04wc

Great fun with this FMT. Used HP3586B + HP3336B (both disciplined by Trimble Thunderbolt) + scope. Thanks Connie!

K7NG

ORE

CN73ui

Another stab at correcting the internal offsets and uncertainties in my setup. I keep telling myself that life would be a lot easier if I got myself a GPS Standard. K5CM 20M and 40M sigs were booming. 80M late run wasn't bad either, except for a fades.

K8CT

MI

EN83ce

KA5QEP

OK

EM15ni

20 M was weak, but readable with processing. Others were good. Not much Doppler.

KB2HSH

WNY

FN02nx

Here goes nothing...AGAIN!! Using fldigi (with the continued assistance of Chuck, N3CRT) and improved calibrating vs WWV/CHU. Even if I'm horribly off, it

KD2BD

NNJ

FN20xd

The Kp-index was 1. Lots of QSB on 40. Very strong signals on 80! All homebrew gear using WWVB as a reference.

KD5MMM

STX

EL19ds

Did not hear 20m transmission. I tried the new Fldigi using CHU as a reference, we'll see..

KD8CGH

OH

EN91he

K3 with QRP Labs VFO/QLG1 GPS disipline and Leo Bodner GPSDO used as reference in fldigi

N0AN

IA

EN22XC

Bodnar Dual Port > SDRPlay RSPdx TS-590sg in parallel showed 14121255.300 (99 Hz +)

N2GL

ORE

cn75kp

HP3586A signal level meter disciplined by HPZ3618 GPS receiver. Solid signal's on 20 and 40. Had trouble finding the 80 meter signal. Thanks Connie!.

N3CRT

NNJ

FN20

A bit more QSB on each band than previous tests. Solid copy on every band into NNJ. Thanks for the fun!

N7EP

WWA

CN87uj

20M west was S7, east was S3 got similar results on both runs. QRN was S1 on 20 M. The first 80 meter signal was stronger than later one and both were quite weak into Seattle. I'm glad the runs lasted longer than 1 minute, as SpecLab is always behind

N7WS

AZ

DM42JH

Thanks Connie. I look forward to these and the added tests are nice. Unfortunately, conditions were awful at my QTH. The early 20-meter run was so-so but summer storms even had me disconnecting antennas between evening runs. All numbers are SWAGs.

N8TW

MI

EN82hh

Good signals, a few dropouts on 80M. Motorola MFTS + Fluke 6070A + Yaesu FT-980 + PC w/ Spectrum Lab & Excel

N9KT

IN

EM69wv

My FIRST FMT! I had a blast. Fifteen minutes of worrying. Followed by five minutes of terror. Followed by fifteen minutes of trying to figure out where I went wrong and then hours of looking at the data. What’s not to love? I used WSJT-X and a 756Pro2. I

VE3GSO

ON

EN92ix

Strong signals with some evening doppler shift. FT7610 with spectrum lab.

VE3OAT

ON

FN25

Thanks again, Connie! Good signals throughout and the extra key-down time is much appreciated. The "statistics of small sample size" is always a risk in our FMTs.

VE3ORY

ON

FN14rf

TNX Connie. Another great FMT. S9 signal on all 3 bands here in Kingston ON. Using a YAESU FTdX-3000, Airspy HF+, fldigi, and a homebrew 80M EFHW. 73 de Rick VE3ORY.

VE3YX

ON

FN16fd

I missed the afternoon 20 m run. My 20 m number is from the 0100 East run. The West run was much weaker and was about 0.7 Hz lower. Method: FLdigi new FMT modem using GPSDO stabilized sig gen for ref. Rig is GPSDO stabilized TS-870. TNX

VE9DAN

MAR

FN65td

Python script, SDRuno, and FLdigi.

W2EMN

NLI

FN30ku

good signal strength on all three bands 7610 with rubidium reference

W2TX

GA

EM74se

Station is RF-590 RX and outboard soundcard; all oscillators locked to GPSDO. Spectrum Lab SW. Tune for ~500 Hz beat note and add the SL reading to the displayed frequency. Afternoon 20M sig ~500 uV,evening 20M very weak, 40M and 80M both near 1 mV!

W3JW

VA

FM17tq

The usual setup here. early 20M sig was S9+10db(east) and S6 (west)/late 20M aig wasS9+25 (east) and S6 (west). The late 20 meter levels were S9+25 east and S6 west.The 40 M sig was S9+15dB. The early 80M sig was S9+10dB and S9+10dB for the late 80M run.

W4IVF

VA

EM96to

How close I came to analyzing the wrong files........Thanks to Connie and all for the test.

W4WJ

STX

EM00mg

Unable to measure Early 20m because of schedule conflict. Late 20m inaudible here. 40m -60dBm with minimal QSB. Heavy doppler. No QRM. 80m Early and Late -70dBm QSB to -100dBm. Minimal doppler. Identical readings for both runs. TNX Connie! 73 Don

W6OQI

LAX

DM04vf

Doppler shift not too bad except for 80 meters.

W7SUA

AZ

dm34rs

Thanks Connie, much fun! Experimentd with the alpha fldigi FMT modem using GPSDO stabilized Siglent 2042X reference signal about 500 Hz below target freq. 20m was bit hard but used 3rd early run. 40m used playback of a wav file with DFT lock, 80m good.

W8WTS

OH

EN91jj

W9GR

SV

CM99mg

Thanks for the late 80M run Connie - all runs were good here near Lake Tahoe but better sigs on 80M at 0340Z.

W9INE

CO

DN70gi

Flex6700 & FLDIGI. Signal strength was good.

W9MDB

IL

EM49hv

Lots of fading....Apache ANAN 100, Bodnar Mini GPS 10MHz rig reference, Bodnar Mini FLDigi Reference, FLDigi 4.1.14.26 FMT Analysis, 141mHz standard deviation

W9TN

IN

EN60

Injected known signal from GPSDO referenced signal generator, and measured beat note with Spectrum Lab. Conditions seemed quite good.

W9ZB

IN

EM69xp

WA2DVU

SNJ

WA4FJC

VA

FM07lf

Tnx for the FMT Connie.

WA7BNM

LAX

DM04td

0340Z 80m measurement 0.644 Hz greater than 0220Z measurement. Lots of point to point variation in 40m and 80m measurements.

WB4HIR

NC

EM95OB

No GPSDO used. HP-3586b locked to local Rb reference. Strong signals during all tests.

WB6RJH

SCV

CM87WA

Rig: ANAN-100D with LatLon-Ru-102 rubidium GNSSDO, Software: fldigi in FMT and Analysis modes

WD4IYE

KY

EM78qx

Did 20 remotely from work. Very sol;id copy but night runs had lots of Doppler or QSB. Thanks Connie!

 

 

 

80 Meters

Call

Section

Grid

TX Frequency

Measured Freq

Error in Hz

Error in PPX

KD2BD

NNJ

FN20xd

3598424.246

3598424.250

0.004

1.11E-09

K6BZZ

AZ

DM33xb

3598424.246

3598424.240

-0.006

1.67E-09

W9GR

SV

CM99mg

3598424.246

3598424.220

-0.026

7.23E-09

WD4IYE

KY

EM78qx

3598424.246

3598424.220

-0.026

7.23E-09

WB6RJH

SCV

CM87WA

3598424.246

3598424.210

-0.036

1.00E-08

N8TW

MI

EN82hh

3598424.246

3598424.288

0.042

1.17E-08

WA4FJC

VA

FM07lf

3598424.246

3598424.200

-0.046

1.28E-08

W3JW

VA

FM17tq

3598424.246

3598424.294

0.048

1.33E-08

WA2DVU

SNJ

3598424.246

3598424.310

0.064

1.78E-08

K5RKS

OK

EM15

3598424.246

3598424.320

0.074

2.06E-08

W2TX

GA

EM74se

3598424.246

3598424.321

0.075

2.08E-08

W4WJ

STX

EM00mg

3598424.246

3598424.343

0.097

2.70E-08

N7WS

AZ

DM42JH

3598424.246

3598424.350

0.104

2.89E-08

K7NG

ORE

CN73ui

3598424.246

3598424.358

0.112

3.11E-08

K8CT

MI

EN83ce

3598424.246

3598424.360

0.114

3.17E-08

VE3YX

ON

FN16fd

3598424.246

3598424.364

0.118

3.28E-08

W7SUA

AZ

dm34rs

3598424.246

3598424.364

0.118

3.28E-08

W9TN

IN

EN60

3598424.246

3598424.366

0.120

3.33E-08

W9INE

CO

DN70gi

3598424.246

3598424.380

0.134

3.72E-08

VE3GSO

ON

EN92ix

3598424.246

3598424.110

-0.136

3.78E-08

VE3OAT

ON

FN25

3598424.246

3598424.390

0.144

4.00E-08

AF9A

IN

EM69wv

3598424.246

3598424.392

0.146

4.06E-08

KA5QEP

OK

EM15ni

3598424.246

3598424.100

-0.146

4.06E-08

AA6LK

SV

CM98kw

3598424.246

3598424.400

0.154

4.28E-08

WA7BNM

LAX

DM04td

3598424.246

3598424.423

0.177

4.92E-08

W2EMN

NLI

FN30ku

3598424.246

3598424.430

0.184

5.11E-08

W8WTS

OH

EN91jj

3598424.246

3598424.432

0.186

5.17E-08

AB2UW

NLI

FN30lu

3598424.246

3598424.440

0.194

5.39E-08

N3CRT

NNJ

FN20

3598424.246

3598424.452

0.206

5.72E-08

W4IVF

VA

EM96to

3598424.246

3598424.453

0.207

5.75E-08

K6FOD

LAX

DM04wc

3598424.246

3598423.940

-0.306

8.50E-08

N7EP

WWA

CN87uj

3598424.246

3598423.893

-0.353

9.81E-08

N2GL

ORE

cn75kp

3598424.246

3598424.700

0.454

1.26E-07

KD5MMM

STX

EL19ds

3598424.246

3598424.700

0.454

1.26E-07

VE3ORY

ON

FN14rf

3598424.246

3598423.620

-0.626

1.74E-07

W6OQI

LAX

DM04vf

3598424.246

3598423.600

-0.646

1.80E-07

W9ZB

IN

EM69xp

3598424.246

3598423.5

-0.746

2.07E-07

N9KT

IN

EM69wv

3598424.246

3598423.22

-1.026

2.85E-07

KD8CGH

OH

EN91he

3598424.246

3598422.5

-1.746

4.85E-07

KB2HSH

WNY

FN02nx

3598424.246

3598426.54

2.294

6.38E-07

VE9DAN

MAR

FN65td

3598424.246

3598414.784

-9.462

2.63E-06

AC6SL

SCV

CM87wd

3598424.246

3598412.77

-11.476

3.19E-06

WB4HIR

NC

EM95OB

3598424.246

3598569.1

144.854

4.03E-05

 

 

 

 

40 Meters

Call

Section

Grid

TX Frequency

Measured Freq

Error in Hz

Error in PPX

KD2BD

NNJ

FN20xd

7064806.735

7064806.710

-0.025

3.54E-09

N9KT

IN

EM69wv

7064806.735

7064806.660

-0.075

1.06E-08

W2TX

GA

EM74se

7064806.735

7064806.834

0.099

1.40E-08

K7NG

ORE

CN73ui

7064806.735

7064806.840

0.105

1.49E-08

W2EMN

NLI

FN30ku

7064806.735

7064806.620

-0.115

1.63E-08

VE3GSO

ON

EN92ix

7064806.735

7064806.610

-0.125

1.77E-08

W4WJ

STX

EM00mg

7064806.735

7064806.867

0.132

1.87E-08

N7EP

WWA

CN87uj

7064806.735

7064806.597

-0.138

1.95E-08

N8TW

MI

EN82hh

7064806.735

7064806.879

0.144

2.04E-08

W9TN

IN

EN60

7064806.735

7064806.886

0.151

2.14E-08

N3CRT

NNJ

FN20

7064806.735

7064806.583

-0.152

2.15E-08

N7WS

AZ

DM42JH

7064806.735

7064806.580

-0.155

2.19E-08

VE3ORY

ON

FN14rf

7064806.735

7064806.910

0.175

2.48E-08

WD4IYE

KY

EM78qx

7064806.735

7064806.940

0.205

2.90E-08

WB6RJH

SCV

CM87WA

7064806.735

7064806.520

-0.215

3.04E-08

AB2UW

NLI

FN30lu

7064806.735

7064806.510

-0.225

3.18E-08

WA4FJC

VA

FM07lf

7064806.735

7064807.000

0.265

3.75E-08

K5RKS

OK

EM15

7064806.735

7064807.010

0.275

3.89E-08

K8CT

MI

EN83ce

7064806.735

7064807.015

0.280

3.96E-08

VE3YX

ON

FN16fd

7064806.735

7064807.019

0.284

4.02E-08

K6FOD

LAX

DM04wc

7064806.735

7064806.430

-0.305

4.32E-08

K6FOD

LAX

DM04wc

7064806.735

7064806.430

-0.305

4.32E-08

WA2DVU

SNJ

7064806.735

7064807.050

0.315

4.46E-08

AF9A

IN

EM69wv

7064806.735

7064807.056

0.321

4.54E-08

W6OQI

LAX

DM04vf

7064806.735

7064806.400

-0.335

4.74E-08

N2GL

ORE

cn75kp

7064806.735

7064806.400

-0.335

4.74E-08

W3JW

VA

FM17tq

7064806.735

7064807.072

0.337

4.77E-08

WA7BNM

LAX

DM04td

7064806.735

7064806.398

-0.337

4.77E-08

K6BZZ

AZ

DM33xb

7064806.735

7064806.393

-0.342

4.84E-08

VE3OAT

ON

FN25

7064806.735

7064807.150

0.415

5.87E-08

W9GR

SV

CM99mg

7064806.735

7064806.320

-0.415

5.87E-08

AA6LK

SV

CM98kw

7064806.735

7064806.300

-0.435

6.16E-08

KA5QEP

OK

EM15ni

7064806.735

7064807.200

0.465

6.58E-08

KD5MMM

STX

EL19ds

7064806.735

7064807.300

0.565

8.00E-08

W9INE

CO

DN70gi

7064806.735

7064807.327

0.592

8.38E-08

W9ZB

IN

EM69xp

7064806.735

7064807.500

0.765

1.08E-07

W4IVF

VA

EM96to

7064806.735

7064807.644

0.909

1.29E-07

W7SUA

AZ

dm34rs

7064806.735

7064808.486

1.751

2.48E-07

W8WTS

OH

EN91jj

7064806.735

7064803.456

-3.279

4.64E-07

KB2HSH

WNY

FN02nx

7064806.735

7064811.770

5.035

7.13E-07

VE9DAN

MAR

FN65td

7064806.735

7064817.259

10.524

1.49E-06

WB4HIR

NC

EM95OB

7064806.735

7064951.500

144.765

2.05E-05

KD8CGH

OH

EN91he

7064806.735

7065488.680

681.945

9.65E-05

AC6SL

SCV

CM87wd

7064806.735

7065965.000

1158.265

1.64E-04

 

 

20 Meters

Call

Section

Grid

TX Frequency

Measured Freq

Error in Hz

Error in PPX

W8WTS

OH

EN91jj

14121254.838

14121254.837

-0.001

7.08E-11

KD8CGH

OH

EN91he

14121254.838

14121254.840

0.002

1.42E-10

W3JW

VA

FM17tq

14121254.838

14121254.841

0.003

2.12E-10

W9INE

CO

DN70gi

14121254.838

14121254.832

-0.006

4.25E-10

W9GR

SV

CM99mg

14121254.838

14121254.830

-0.008

5.67E-10

N7EP

WWA

CN87uj

14121254.838

14121254.830

-0.008

5.67E-10

N8TW

MI

EN82hh

14121254.838

14121254.851

0.013

9.21E-10

AF9A

IN

EM69wv

14121254.838

14121254.853

0.015

1.06E-09

AB2UW

NLI

FN30lu

14121254.838

14121254.820

-0.018

1.27E-09

WA2DVU

SNJ

14121254.838

14121254.820

-0.018

1.27E-09

W9TN

IN

EN60

14121254.838

14121254.818

-0.020

1.42E-09

N3CRT

NNJ

FN20

14121254.838

14121254.860

0.022

1.56E-09

K7NG

ORE

CN73ui

14121254.838

14121254.860

0.022

1.56E-09

N7WS

AZ

DM42JH

14121254.838

14121254.860

0.022

1.56E-09

W7SUA

AZ

dm34rs

14121254.838

14121254.810

-0.028

1.98E-09

VE3OAT

ON

FN25

14121254.838

14121254.801

-0.037

2.62E-09

N2GL

ORE

cn75kp

14121254.838

14121254.800

-0.038

2.69E-09

WD4IYE

KY

EM78qx

14121254.838

14121254.880

0.042

2.97E-09

WA7BNM

LAX

DM04td

14121254.838

14121254.896

0.058

4.11E-09

W2EMN

NLI

FN30ku

14121254.838

14121254.780

-0.058

4.11E-09

WB4HIR

NC

EM95OB

14121254.838

14121254.900

0.062

4.39E-09

W6OQI

LAX

DM04vf

14121254.838

14121254.900

0.062

4.39E-09

KA5QEP

OK

EM15ni

14121254.838

14121254.900

0.062

4.39E-09

K6BZZ

AZ

DM33xb

14121254.838

14121254.924

0.086

6.09E-09

K6FOD

LAX

DM04wc

14121254.838

14121254.710

-0.128

9.06E-09

VE3YX

ON

FN16fd

14121254.838

14121254.688

-0.150

1.06E-08

WA4FJC

VA

FM07lf

14121254.838

14121255.000

0.162

1.15E-08

K8CT

MI

EN83ce

14121254.838

14121255.046

0.208

1.47E-08

WB6RJH

SCV

CM87WA

14121254.838

14121254.580

-0.258

1.83E-08

VE3ORY

ON

FN14rf

14121254.838

14121254.560

-0.278

1.97E-08

AA6LK

SV

CM98kw

14121254.838

14121254.550

-0.288

2.04E-08

K5RKS

OK

EM15

14121254.838

14121254.520

-0.318

2.25E-08

N0AN

IA

EN22XC

14121254.838

14121255.201

0.363

2.57E-08

AC6SL

SCV

CM87wd

14121254.838

14121255.210

0.372

2.63E-08

N9KT

IN

EM69wv

14121254.838

14121255.640

0.802

5.68E-08

W9MDB

IL

EM49hv

14121254.838

14121255.705

0.867

6.14E-08

VE3GSO

ON

EN92ix

14121254.838

14121253.760

-1.078

7.63E-08

W9ZB

IN

EM69xp

14121254.838

14121256.000

1.162

8.23E-08

W4IVF

VA

EM96to

14121254.838

14121256.170

1.332

9.43E-08

VE9DAN

MAR

FN65td

14121254.838

14121257.301

2.463

1.74E-07

KB2HSH

WNY

FN02nx

14121254.838

14121263.230

8.392

5.94E-07

 

 

 

 

Average PPX for all three runs

Call

Section

Grid

Total Error in Hz

Total Averge Error PPX

N8TW

MI

EN82hh

0.199

1.10E-08

W2TX

GA

EM74se

0.178

1.17E-08

WD4IYE

KY

EM78qx

0.273

1.31E-08

K7NG

ORE

CN73ui

0.239

1.58E-08

N7WS

AZ

DM42JH

0.281

1.75E-08

W9TN

IN

EN60

0.291

1.87E-08

K6BZZ

AZ

DM33xb

0.434

1.87E-08

WB6RJH

SCV

CM87WA

0.509

1.96E-08

W3JW

VA

FM17tq

0.388

2.04E-08

WA4FJC

VA

FM07lf

0.473

2.06E-08

WA2DVU

SNJ

0.397

2.12E-08

W9GR

SV

CM99mg

0.449

2.22E-08

W2EMN

NLI

FN30ku

0.357

2.38E-08

N3CRT

NNJ

FN20

0.380

2.68E-08

K5RKS

OK

EM15

0.667

2.73E-08

VE3YX

ON

FN16fd

0.552

2.79E-08

AB2UW

NLI

FN30lu

0.437

2.90E-08

AF9A

IN

EM69wv

0.482

2.90E-08

WA7BNM

LAX

DM04td

0.572

3.37E-08

VE3OAT

ON

FN25

0.596

3.38E-08

KA5QEP

OK

EM15ni

0.673

3.69E-08

N7EP

WWA

CN87uj

0.499

3.94E-08

W9INE

CO

DN70gi

0.732

4.05E-08

AA6LK

SV

CM98kw

0.877

4.16E-08

VE3GSO

ON

EN92ix

1.339

4.39E-08

K6FOD

LAX

DM04wc

0.739

4.58E-08

K6FOD

LAX

DM04wc

0.779

4.95E-08

N2GL

ORE

cn75kp

0.827

5.88E-08

VE3ORY

ON

FN14rf

1.079

7.28E-08

W6OQI

LAX

DM04vf

1.043

7.71E-08

W4IVF

VA

EM96to

2.448

9.35E-08

W7SUA

AZ

dm34rs

1.897

9.42E-08

N9KT

IN

EM69wv

1.903

1.18E-07

W9ZB

IN

EM69xp

2.673

1.33E-07

W8WTS

OH

EN91jj

3.466

1.72E-07

KB2HSH

WNY

FN02nx

15.721

6.48E-07

VE9DAN

MAR

FN65td

22.449

1.43E-06

WB4HIR

NC

EM95OB

289.681

2.02E-05

KD8CGH

OH

EN91he

683.693

3.23E-05

AC6SL

SCV

CM87wd

1170.113

5.57E-05

 

Click to view Average PPX Chart

 

 

Stations coping all three runs to better than .2 Hz

Call

Section

Grid

N8TW

MI

EN82hh

W2TX

GA

EM74se

WD4IYE

KY

EM78qx

K7NG

ORE

CN73ui

N7WS

AZ

DM42JH

W9TN

IN

EN60

W2EMN

NLI

FN30ku

 

 

 

Transmitting equipment used by K5CM for this FMT:

A HP Z3801 GPS frequency source clocks a HP-3336B. The output is feed to a 10 db transistor amp which drives a 12BY7 / pair 6146. Then to a AL-1500 running about 750 watts out.  There are no mixers or any device in the chain of amplifiers that might impact the accuracy of the GPS frequency source.  As a reality check,  I periodically log the frequency source against WWV and other GPS referenced sources.  I monitor each transmission with a completely separate receive system to look for any instability or short term drift. 

I typically see considerably less than 1 mHz difference at 10 Mhz when comparing  two Z3801's or a Z3801 and a Thunderbolt, over a 10 to 10,000 second period. 

 

Antennas:

 80 - Dipole.  (favors West, North, East)

 40 - Standard Dipole hanging between two 80 foot towers. (favors East, West)

 20 - TH7 at 80 feet

 

73,

Connie

K5CM

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