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Messages - RobRich

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121
Carrier and light musical modulation at 2230z. SIO 222 trending 221. Airspy HF+D and 148; loop-on-ground. Rough copy at the moment, but it is there.

Thanks for the broadcast! :)

122
1939z - Music. SIO 333 trending 322 at times via NA5B WebSDR in Washington, DC. Some band noise and moderate fading. Not an easy listen at times, but generally copyable for the most part.
1947z - Station ID
2001z - Off air

Thanks for the broadcast! :)



Nothing locally here. Not too surprising considering the current solar weather conditions.


(click to enlarge)

123
10/11 meters / 11m Band Activity 10 FEB 2024
« on: February 10, 2024, 1215 UTC »
Traces of 11m DX from Europe well before 1200z on 27540u, 27555u, etc. England, France, etc. popped above the noise floor after 1200z, plus DX activity starting on the usual 11m CB frequencies.

1230z - 27000u - Ongoing SSTV traffic from Europe and Mexico
1233z - 27700u - Venezuela op calling CQ
1925z - 27385l - Hawaii op working DX

MSI SDR and 18' end-fed vertical.


(click to enlarge)

124
ID at ~2322z into music. SIO 433 via MSI SDR and active miniwhip.

Thanks for the broadcast and shout-out! :)

125
Equipment / Re: Cre 8900 10 Meter radio
« on: February 06, 2024, 0200 UTC »
Probably around 2-3 watts to limit splatter from clipping, though AFAIK and like many other smaller "10m" amps, most of those RMI amps are spec'd at ~5w max.

Quote
This radio is not a big AM swinging radio.  If you lower the deadkey down to 1 watt the radio will only swing to around 5 watts.

Source: https://cbradiomagazine.com/cre-8900-10-meter-ssb-export-radio/

Appears more than sufficient on AM. You *might* get away with an extra watt or few on SSB, but seriously take care. Do not opt for overdriving the amp even if the output falls somewhat short of 100w. More than a few watts into most of these smaller amps and your signal will likely clip into splattering; that is assuming overdriving the MOSFETs or whatever transistors in the amp's output stage do not fail first.

If you do not have a watt meter to measure the radio output, find one, even if it is a loaner from another area operator.

BTW, I assume you are referencing one of the regular RMI models and not the rather expensive MLA100 with selectable filters. If so please put a 30MHz lowpass filter after the amp to limit harmonics. You can often source older Drake, Johnson, or similar 100w (or higher power) 30MHz lowpass (TVI) filters for like $15 to $30 at eBay. Probably even cheaper at a local hamfest.

126
Intermittent waterfall carrier and occasional faint traces of modulation mostly in the noise floor at 2026z. Airspy HF+D and 31' vertical.

127
Music at 2208z. Off air at 2210z? SIO 332 with fading. Airspy HF+D and 31' vertical.

Thanks for the broadcast! :)

128
I caught the last few seconds of an anthem and then off air. Apologies for no stats, but it was nonetheless copyable. Airspy HF and 148' loop-on-ground.

Thanks for the broadcast! :)

129
Equipment / Re: Best MWDX antenna?
« on: February 02, 2024, 2004 UTC »
Some longwave NDB loggings as well:

https://www.hfunderground.com/board/index.php/topic,124922.0.html

An outdoor remote-tuned ferrite loopstick probably would fare even better at longwave and below, but a simple vertical with even limited RF grounding tends to suffice at low frequencies assuming it is not completely swamped with local RFI/EMI.

I remember my 31' having quite impressive (to me anyway) low-frequency performance with a YCCC preamp. Instead of outright gain, the YCCC feedpoint preamp is designed to improve matching an electrically short antenna to a low-impedance coaxial feedline. Worked nicely for that, but it overloaded on some HF bands. It was not intended for a 31' vertical with a radial field back when I have that antenna ground mounted.

Occasionally I think about redeploying the YCCC preamp, but with a 9' or an 18' vertical element over a single ground rod as intended by the designer.

130
Equipment / Re: Best MWDX antenna?
« on: February 01, 2024, 0639 UTC »
Audiophile and SBC enthusiasts have driven up demand for 5v linear power supplies. There are lots of new models from China flooding into the market in recent years. My concern is the specs, or more often like the lack thereof. "Low noise" does not mean much IMO, and reviews can be all over the place as well since parts can change from production run to run.

Anyway, yeah, I am with ya'. At least the older supplies for lab, plc, and other precision uses are typically "known quantities" with often many years of stabilized designs.

The Lambda LCS-CC-5-O I ended up ordering is older and used, but I suppose if it does eventually need work like new caps at least most of the parts are probably through-hole. SMD parts and my hands really do not go well together anymore.

Speaking of linear power supplies, I recently moved my cable modem and network router to one. Probably no real difference, but it eliminated two more switchers.



Seeing as my 31' vertical seems to be doing decent at lower frequencies, I took a skim of VLF frequencies after midnight EDT.

18.3 HWU Le Blanc, France
21.4 NPM Lualualei, Hawaii
23.4 DHO38 Rhauderfehn, Germany
24.8 NLK Seattle, Washington
25.2 NML LaMoure, North Dakota
40.0 UNID (seriously doubt JJY Tamura, Japan ;p )
40.7 NAU Aguada, Puerto Rico
45.9 NSY Niscemi, Italy
52.0 UK Navy?
60.0 WWVB Fort Collins, CO
62.6 FUG La Regine, France
65.8 FUE Kerlouan, France
77.5 DCF77 Mainhausen, Germany
162.0 TDF / ALS162 Allouis, France
198.0 BBC4 carrier / UK-AMDS

131
Longwave Loggings / Longwave NDB Loggings 1 FEB 2024
« on: February 01, 2024, 0422 UTC »
I am not really into beacon monitoring, but I noted considerable longwave beacon activity tonight. Thought I would log some. It is a partial list as there were several (to many?) more weak signals I skipped trying to decode.

Airspy HF+D and 31' vertical. These are mostly fldigi decodes, plus there are a few manually keyed decodes. Admittedly I am horrid with CW. ;p

0148z - 366 EZM Eastman, GA
0149z - 363 RNB Millville / Rainbow, NJ
0152z - 359 LYZ Bainbridge / Willis, GA
0224z - 323 OUK Calhoun, GA (listed as decommissioned?)
0226z - 332 FIS Key West, FL
0229z - 353 VV Greensboro/Junne, GA
0231z - 353 UNID underneath VV
0237z - 366 EZM Eastman, GA
0240z - 379 BRA Asheville / Broad River, NC
0242z - 391 DDP San Juan, Puerto Rico
0250z - 405 UNID "8888" repeating
0252z - 407 BZ Statesboro / Bulloch, GA
0255z - 412 CTZ Clinton, NC
0300z - 417 SLP Shelby / First River, NC
0301z - 420 CFY Lake City / Evans, SC
0303z - 269 GN Gainesville, FL
0305z - 260 MTH Marathon, FL
0318z - 344 JA Jacksonville, FL
0320z - 346 VU Albemarle, NC
0327z - 349 GW Greenwood, MS
0337z - 372 UQN Vidalia / Onyun, GA
0340z - 375 DS Searcy, AR
0347z - 379 UNID underneath BRA
0349z - 385 EMR Augusta / Emory, GA
0349z - 385 UNID underneath EMR
0356z - 426 UV Oxford, MS
0408z - 224 BH Birmingham, AL
0409z - 260 UNID underneath MTH

132
Longwave Loggings / Radio Antena Satelor 153 AM 0358 UTC 1 FEB 2023
« on: February 01, 2024, 0405 UTC »
Music at 0358z. SINPO 45242. ~S7 via Airspy HF+D and 31' vertical. DSB sync tuning. Moderate static crashing. Listenable, but it is a rough copy.

Verified against online stream.

133
Longwave Loggings / Medi 1 171 AM 0132 UTC 1 FEB 2024
« on: February 01, 2024, 0137 UTC »
Music at 0132z. SINPO 35443. ~S6 via Airspy HF+D and 31' vertical. DSB sync tuning. Some static crashing, but listenable copy.

Verified against online stream.

134
FM DX Loggings / FM DX Propagation 31 JAN 2023
« on: February 01, 2024, 0022 UTC »
I am not an active FM DXer, and it was only a relatively short hop, but around 12:00AM EDT earlier today I noted an occurrence of FM BCB propagation

WCFB Deland on 94.5 at ~80 miles away was knocked out temporarily by WARO Fort Myers at ~300 miles away. Lasted several minutes.

The tropospheric ducting forecast for 1/30/2024 predicted marginal to fair conditions for propagation along Florida's west coast.

BTW, it certainly was not the antenna. ;) I have one of those small inexpensive Bingfu dipoles vertically oriented in a window for local FM BCB. At 10" wide it likely would be much better suited for UHF. Anyway, it was padding for free shipping of an Amazon order, and it looks slightly better than the two wires I had there previously.

135
Music at 2342z. SINPO 55343. ~S9 via MSI SDR and 18' end-fed vertical. AM sync tuning. A little noisy, but a listenable copy.

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