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Messages - uhf35

Pages: [1] 2
1
TV DX Loggings / Re: TV DXing from the transmitting side of the hobby
« on: February 26, 2024, 1724 UTC »
Well... mine is a little different story, but not too much.

From 1987 to around 1994 I was a "gatekeeper" for the TV rebroadcast station in the city where I lived at the time. In a province in the interior of Argentina. With resources and property from the local council, we operated three signals placed on channels VHF 11, UHF 29 and UHF 35 respectively PAL-NC (German PAL mode but with NTSC line ratio, due to the need to provide compatibility -at the time of the arrival of color -, with the previous 525-line technology of monochrome televisions imported from the USA and our 50 electric cycles)
All with tree national "Ditel" transmitters of 500 watts each, in video, and a lower power ratio for the FM channel of the audio carrier.

In the first case, the station linked by air from the "previous" retransmitter in channell VHF 9, about 55 km away, suffered from continuous fading and saturation events in the summer "tropo" periods. I remember that the transmitter was prepared to turn off one minute after the start of the overload episode, which always caused a period of negative image and synchronization interruption that was quite undesirable to be transmitted.

On the other hand, the case of the two UHF stations was noticeably more stable.

Channel 29 was operated with satellite downlink and generally had no problems.
Channel 35 lasted for a while, remaining on "delayed program" (yes, even well into the '80s.) For years they sent me by bus an S-VHS cassette -recorded at the slowest possible speed with the "yesterday program without news segments."  ;D -, which I plays when I arrived to do my daily revision of the station, after leaving high school, around 7 pm. And it auto power off when tape ends and video carrier dissapear. During the last three years of attendance, they put on a satellite disc also for this station.

The VHF channel antennas were simple bidirectional crossed yagis (without a reflector) were at the top on about 48 meters of mast, while the UHF panels (without plastic cover, it didn't snow there or anything like that), a little further down.

I remember that the VHF performance was better towards the surrounding towns up to about 40 kilometers with fairly low receiving antennas, but much more unstable due to the multiple interferences and atmospheric abnormalities of the band, while UHF had less performance (needing directional corner reflect antennas placed at greater height, but with a much more stable and "clean" signal. There were also many fewer complementary services and signal-based appliances generating spurious radioelectric radiation in urban plants.

Around 1995, when I started university in this other city, I passed the work to friend. Today the station is fully automatic with hardly any periodic inspection, but with many more errors and outages.

2
I dont think that the Cassette is massibly returning.

May be this is similar to "Vinyl return", with excepcional costs and regular quality of new copies compaired with old ones. Only a return in "fanatic mode" by new people, or  nostalgic remember by old ones.

But, going to basics... -and blank the fact of I m a very... very fan of CD tech how an advanced in time and disrupt format when it born at end of 70s-...

I believe that (for equally duración and quality in mobile situation, cars, outdors, etc.), "the little box" (Compact Cassette), is most reliable, practical and robust way of carry music, -cause: CD is more "destroyable" and digital ones... well... in this format problem is not the content but interfacing devices, most of these literally "discartbly" ones in "undesirable yard situation"

In fact, pirate SW portable emissions may be a good example for needry of Cassette return ;)

That's unlike vinyl which had its dynamic advantages, or CD's which have their capacity advantages.

Yes, but... dynamic vinyl advantages are more commonly dependable of mastering audio process, is not an intrinsecall format advantage. Good times of mastering maked good vinyl and, logically, loudness war times maked bad CDs from mid nineties... But, this fact is also true if invert.

May be you refer to more reliably (sub and suprasonic) frequency response of vinyl (majorly inaudible), compaired with Nyquist 44100/16 cut of CD, but this fact crashs with cross pickup position read angle (that destroy fidelity from mid of 33/12 inches record sides to end), and horrible signals to noise ratio compaired with CD or digital ones, although the 16 to 19 KHz response of cassettes (talking of CR2 of Fe tapes and  directly function of quality of recording deck), of course, is not an amazing feature of this format...

3
ID and Translation Requests / Re: 4134 USB unid meteo
« on: August 22, 2023, 1329 UTC »
Spanish...

https://www.argentina.gob.ar/prefecturanaval/avisos/comodoro_rivadavia

Quote
VTS Comodoro Rivadavia ( Argentina ) - Marítimo
TECNOLOGÍA DE IMÁGENES DE TRÁFICO: AIS-S- HF-AIS C. DISPONIBILIDAD DEL SERVICIO: 24 HORAS.
OTROS SERVICIOS / CARACTERÍSTICAS: RADIOCONSULTAS MÉDICAS TODAS LAS COMUNICACIONES VHF Y HF SON GRABADAS.

Área de Coberta:
LIMITE NORTE: Desde la costa ( Paralelo 42 ° 00 ') hasta el límite de la Zona Económica Exclusiva Argentina ( 200 MN ).
LIMITE SUR: Desde la costa ( Paralelo 54 ° 30 ') hasta el límite exterior de la Zona Económica Exclusiva Argentina ( 200 MN ).
Vía: HF 4134 Khz – 8710 Khz VTS Comodoro Rivadavia Marítimo ( indicativo de llamada L3A ).
Nota: la estación manteno escucha permanente en los canales de fútbol, emergencia y seguridad del SMM ( 2182 Khz y 4125 Khz ).



Informa:
Todos los buques deben informar al ingreso / género de aguas nacionales:

Buques pesqueros: a las horas 0200, 1000 y 1800 UTC.
Otros buques: a las horas 0200 y 1400 UTC.
Servicios de ingresos:
Información sobre Seguridad Marítima en HF a 0440 – 0740 – 1740 – 2040 UTC en Frecuencias. 2065 Khz, 4149 Khz, 8294 Khz..
Información sobre Seguridad Marítima a través de NAVTEX ( MF ): en idioma Inglés por 518 KHZ a 0320-0620-1120-1420-1920-2220 UTC; o en idioma Español por 490 KHZ a las 0220-0720-1020-1020-1320-1820-2320 UTC.
Radioconsulta Médicas vía: 4134 Khz, 8710 Khz VTS Comodoro Rivadavia Marítimo ( indicativo de llamada L3A ).

Autoridad competente
PREFECTURA NAVAL ARGENTINA a través del V.T.S. Comodoro Rivadavia. Tel / Fax: + 542974476800
Correo electrónico: criv@prefecturanaval.gov.ar
Dirección: Avenida Máximo Abásolo No 951, Comodoro Rivadavia, Pcia. del Chubut CP9000 - Argentina

Los buques pueden obtener mayor información kstm@prefecturanaval.gov.ar y la página web argentina.gob.ar/prefecturanaval.

4
16:57 UTC German Final SRF News one more time.
Then Radio Slovakia International
Freq. displaced to 521.68 KHz

Audio: https://voca.ro/1b1zUWvVMo2Y

5
edit by Ray, the original subject line was
Radio ¿Menian? Int. 522 AM 19:00 UTC 7 May 2023 Relay SRF/RSlovakia Gerwisch SDR



That is...

Cland/Pirate 522 KHz AM carrying the SRF 4 audio news on Gerwisch (Ger) Kiwi SDR



It does not seem that the audio is limited to the width of a regular channel for the center of Europe...

-00:00 Final Music from SRF program.
-03:42 ID (Overmodulated) "Sia is Radio ¿Menian? International" (I doesn't understand any word of german. Help me with the ¿ID?)
-04:28 News

Audio: https://vocaroo.com/1n2PR5EwKUAQ

 :o

6
Question is, will they be able to run with any of these ideas?

We'll see what comes of this

Thank You very much!

😊

7
Other / The KVNU's Transmitter (Logan, Utah), being a bad boy!
« on: March 10, 2023, 1739 UTC »
"I Tawt I Taw a Puddy Tat" :P

490 KHz spurious. It's lucky that the international distress channel is rarely used these days... anyway... not really needed in the Utah ocean either 😊😆

 https://youtu.be/QfnvS8K1cq8

 ;D

8

The 1540.205 kHz station shows up here as well:


Hi! Minimal comment: I was reading new topics and came across this one, while listening to KYND 1520 KHz from Pattinson, TX. The point is that I observed that in the SDR of the Waller Country Club Radio, an "unidentified carrier" is labeled at 1536! KHz :o , with no modulation but with what appears to be a slight tone (I really couldn't be sure. The level of signal are minimal and the "scratches" due to modulation in the KYND's upper side band are quite intense.)



9
QSLs Received / Lupo Radio. Buenos Aires. eQSL.
« on: November 23, 2017, 0358 UTC »
Reception report:
November 20, 2017
22:42 (Arg.) UTC-3 Tango Performer: Alberto Castillo
Follow by "Voz de barrio"
"Es en la paz de la noche cuando se visten los patios porteños..."
Call-ID "(castillan spanish ¿voice synth?) Frecuencia 6973 KiloVERCIOS AM
desde la Provincia de Buenos Aires Lupo Radio. Reporte de SEÑAL a
luporadio@hotmail.com"
22.46 (Arg.) UTC-3 Tango "Antiguo reloj de cobre"
Follow by "¿Qué te pasa Buenos Aires?" "yo soñaba ver con ella
la porteña (...) ya no queda ni una seña, etc."
Freq. 6973 KHz
SINPO: 32112
Spurious Local interference by LT14 MW 1260 KHz (25 Kw-1,6 Km.)
Receiver: Portable Sony ICF7600GR
Antenna: Sony AN-61P (Indoor)
Paraná. Argentina. -31.766133, -60.527364
73's
-------------------
"lupo radio<luporadio@hotmail.com>   21 de noviembre de 2017, 0:28
Para: Me <---------------@------.com>
Sr. --------------.

Agradezco su reporte, todo correcto...
La propagación esta muy bien para distancias de unos 1300km, por los reportes recibidos, ok a LT 14  y demás.... para un DXista es un problema!! SUERTE EN SUS ESCUCHAS.

La potencia 25 watt en antena, cualquier inquietud no dude en preguntar.

Saludo cordial, gracias por escribir, atte LUPO.
adjunto qsl."



 ;D

10
And, the answer is YES. But... (always there is a "but") It is true only electronically speaking. The major problem for the 620 to use in RF is a Rds (on) (1,5) against 0,54 of 510 (in fact, the most reliably is IRF520 with 0,27.) A resistance from drain to source low, there will be a tiny voltage drop across it and more signal into amplifier ;)

11
Equipment / Re: yet another antenna question...near field effects?
« on: August 26, 2015, 1403 UTC »
My experience has been the same, loops (and folded dipoles, which geometrically are somewhat similar to a loop) tend to pick up less local RFI/noise than dipoles or random wire antennas.

FWIW, I found a 7600-GR schematic here, I assume the 7600 models are pretty similar: http://stephan.win31.de/icf-sw7600gr.servicemanual.pdf

Yes but, the 7600GR has an active antenna power supply band in it's antenna jack, that's not  protected by diode. If puts any standard plug, you are on risk of burn something.

12
General Radio Discussion / Re: For The Love Of Radio
« on: August 18, 2015, 1757 UTC »
An interesting technical write-up of a summer camp radio station:

http://www.engineeringradio.us/blog/2015/08/for-the-love-of-radio/

Yes, it's enjoyable work :D However, after "Tim" (August 16, 2015 at 8:09) comment, things get still more interesting even xD!

I remember >> http://www.engineeringradio.us/blog/2011/08/shortwave-pirate-broadcasting/

13
From the left to the right: Oscillator, Frequency Doubler (and Buffer), PA Stage and Filter. The PO will be around 1.1W. One Vari-Cap is to pull the X-Tal and the second tunes the Inductor for the Frequency Doubler into resonance.



How did you etch the board?  Looks pretty good.

I would like to know it also ;D

14
MW Loggings / Re: Local WRCR moved from 1300 kHz to 1700 kHz
« on: July 24, 2015, 0026 UTC »
USA 1700 KHz North-East Part 15'rs are quite confused and angry http://www.part15.us/forum/part15-forums/general-discussion/wrcr-ny-starting-1700-khz-mon-july-13 :P

15
Software / Re: eQSL Factory
« on: July 22, 2015, 0004 UTC »

Thanks!  ;D

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