We seek to understand and document all radio transmissions, legal and otherwise, as part of the radio listening hobby. We do not encourage any radio operations contrary to regulations. Always consult with the appropriate authorities if you have questions concerning what is permissible in your locale.

Author Topic: Good old days  (Read 6685 times)

Offline ChrisSmolinski

  • Administrator
  • Marconi Class DXer
  • *****
  • Posts: 32460
  • Westminster, MD USA
    • View Profile
    • Black Cat Systems
Re: Good old days
« Reply #30 on: April 17, 2025, 1149 UTC »
My only issue with SDRs is that they don't seem to be very good receivers.  I guess that's a big issue :)

It depends on the SDR.  Modern high end SDRs definitely beat "premium" analog radios - R71A, NRD-545, etc. I've had those, and one reason I got rid of my NRD-545 is that my netSDR left it in the dust and I stopped using it. If you're in a high RFI environment, it probably doesn't matter as much, you're limited by that more than the capabilities of the radio.
Chris Smolinski
Westminster, MD
eQSLs appreciated! csmolinski@blackcatsystems.com
netSDR / AFE822x / AirSpy HF+ / KiwiSDR / 900 ft Horz skyloop / 500 ft NE beverage / 250 ft V Beam / 58 ft T2FD / 120 ft T2FD / 400 ft south beverage / 43m, 20m, 10m  dipoles / Crossed Parallel Loop / Discone in a tree

Offline n2avh

  • Sr. Member
  • ****
  • Posts: 284
  • State College PA
    • View Profile
Re: Good old days
« Reply #31 on: April 17, 2025, 1343 UTC »
Are SDRs more susceptible to noise than the best analog receivers of yesteryear? I am always surprised at the bad s/n of the KiwiSDRs, not just posted numbers but actual listening experience. But I'm also comparing today's RF environment with long ago, and things may just be noisier now.   
Big into SWDX late 70s through early 90s, then forgot about it and when I returned via SDRs it wasn't at all what I remembered, but I'll deal with it. Grumble, grumble. All SDRs acknowledged, nothing is from my own radio.

Offline ChrisSmolinski

  • Administrator
  • Marconi Class DXer
  • *****
  • Posts: 32460
  • Westminster, MD USA
    • View Profile
    • Black Cat Systems
Re: Good old days
« Reply #32 on: April 17, 2025, 1832 UTC »
Are SDRs more susceptible to noise than the best analog receivers of yesteryear? I am always surprised at the bad s/n of the KiwiSDRs, not just posted numbers but actual listening experience. But I'm also comparing today's RF environment with long ago, and things may just be noisier now.

No, properly designed they're probably equal to those best/classic analog receivers.  And maybe better in some cases.

The vast majority of KiwiSDR installations are... sub optimal. That's probably causing the perception that the SDRs themselves are the issue, when in reality it's something else.

I'm 99% sure what you're seeing/experiencing with KiwiSDRs are situations with:
1. A lot of local RFI
2. Poor antennas
3. Common mode feedline issues

Also, SDRs let you "see" a lot of RFI/etc. that was always there in the past, but mostly hidden with old analog receivers, unless you happened to be tuned to the right (or is that wrong) frequency.
Chris Smolinski
Westminster, MD
eQSLs appreciated! csmolinski@blackcatsystems.com
netSDR / AFE822x / AirSpy HF+ / KiwiSDR / 900 ft Horz skyloop / 500 ft NE beverage / 250 ft V Beam / 58 ft T2FD / 120 ft T2FD / 400 ft south beverage / 43m, 20m, 10m  dipoles / Crossed Parallel Loop / Discone in a tree

Offline John Poet

  • DX Legend
  • ******
  • Posts: 1082
  • USA
  • The dog ate my license.
    • View Profile
    • The Crystal Ship Shortwave
    • Email
Re: Good old days
« Reply #33 on: April 18, 2025, 0252 UTC »
Oh yeah... I too was a member of NASWA, reader of Frendx and sometimes SPEEDX in the latter 1970's while a young teenager, working with a Realistic DX-160 after the old Heathkit 4-tube receiver...  It was of course the FRENDX reporting on the Voice of the Voyageur pirate station which primarily influenced me and led to the creation of my pirate station 'The Crystal Ship' in 1982. 

(Also recall the controversy at the time, with FRENDX publishing "pirate" loggings while SPEEDX refused to do so, if memory serves...  This refusal by some DX clubs to publish pirate radio loggings led to the creation of the ACE, Association of Clandestine Enthusiasts, dedicated to pirate and spy loggings, in 1982-- just prior to The Crystal Ship hitting the airwaves.)

My favorite SWBC stations which were at least 'somewhat DXy' (by power level) were Radio Tahiti-- I have fond memories of listening to that on summer evenings around greyline time on 15 mhz, it actually came in pretty well, although I think the power level was only about 20kw--- and the Port Moresby PNG station on 4890  (had to get up early in the morning for that one, in the winter if I recall correctly... before dawn, when there was the largest path of darkness between our locations).

I had several other target stations which I aspired to, but could never quite pull off, all low-powered stations in the southwest Pacific:

The New Hebrides Broadcasting Service (now their country has another name which I can't recollect at the moment):
THINK I might have actually heard that one, broadcasting around 3945 khz, if memory serves---
broadcasting some kind of religious services--- but the static was so bad, I was unable to provide any solid details in my reception report, so my attempt at verification was rejected.

The Solomon Island Broadcasting Service, I think on 5020 kHz--- never had any luck with that one---

And the ultra-elusive Cook Islands Broadcasting Service--- also somewhere above 5 mHz, I think--- 5045 kHz??
never had any luck with that one, either.


On the other hand, I also submitted a reception report to the North Korean station,
and received a most awesome QSL package from them, complete with some kind of communist pin, in red--
(I still have that around here somewhere, guess I ought to dig it out again and photograph it)--

The thing about that one was, it too was very poor reception with no positive ID,
and I was not convinced myself that I had actually heard the station....
but they rewarded me most handsomely for my pitiful report!   LOL


(oh--- and THANK YOU SO MUCH for posting that FRENDX archive link---
I am going to spend some time there-- already have!!)



« Last Edit: April 18, 2025, 0351 UTC by John Poet »

John Poet

"A treasonous voice of dissent"
"I love the smell of a hot Johnson in the morning..."



The Crystal Ship Shortwave

On Twitter  https://x.com/tcsshortwave
.

Offline John Poet

  • DX Legend
  • ******
  • Posts: 1082
  • USA
  • The dog ate my license.
    • View Profile
    • The Crystal Ship Shortwave
    • Email
Re: Good old days
« Reply #34 on: April 18, 2025, 0258 UTC »


 it is too bad we didn't have today's technology back then when there was a ton of stations still on the air.


Simply having a receiver with a digital readout was my DREAM back then--

eventually I learned to more accurately identify my frequency on the analog receivers,
and calibrate the bandspread via the time stations and a 100 khz calibrator signal....


John Poet

"A treasonous voice of dissent"
"I love the smell of a hot Johnson in the morning..."



The Crystal Ship Shortwave

On Twitter  https://x.com/tcsshortwave
.

Offline John Poet

  • DX Legend
  • ******
  • Posts: 1082
  • USA
  • The dog ate my license.
    • View Profile
    • The Crystal Ship Shortwave
    • Email
Re: Good old days
« Reply #35 on: April 18, 2025, 0306 UTC »


 "lone cries in the wilderness" type stations 


yeah... I resemble that remark!



John Poet

"A treasonous voice of dissent"
"I love the smell of a hot Johnson in the morning..."



The Crystal Ship Shortwave

On Twitter  https://x.com/tcsshortwave
.

Offline John Poet

  • DX Legend
  • ******
  • Posts: 1082
  • USA
  • The dog ate my license.
    • View Profile
    • The Crystal Ship Shortwave
    • Email
Re: Good old days
« Reply #36 on: April 18, 2025, 0318 UTC »
Are SDRs more susceptible to noise than the best analog receivers of yesteryear? I am always surprised at the bad s/n of the KiwiSDRs, not just posted numbers but actual listening experience. But I'm also comparing today's RF environment with long ago, and things may just be noisier now.

No, properly designed they're probably equal to those best/classic analog receivers.  And maybe better in some cases.

The vast majority of KiwiSDR installations are... sub optimal. That's probably causing the perception that the SDRs themselves are the issue, when in reality it's something else.

I'm 99% sure what you're seeing/experiencing with KiwiSDRs are situations with:
1. A lot of local RFI
2. Poor antennas
3. Common mode feedline issues

Also, SDRs let you "see" a lot of RFI/etc. that was always there in the past, but mostly hidden with old analog receivers, unless you happened to be tuned to the right (or is that wrong) frequency.


I have been pretty happy now with reception on SDRs--- being limited to those alone, ever since coming back to the shortwave scene around last Christmas....

They have sprung up like fleas.   If one doesn't work so well, you try another....
and it is somewhat sporting to follow a pirate station's propagation across the continent,
by switching to another SDR further west, usually, when your current signal degrades...

Using online SDRs is far superior to being limited to only your own receiver and location, with its own noise, with whatever antenna you have....!

I'd almost like to put up one myself...


Yeah, ten years ago a lot of SWLs or even 'pirate listeners' felt that using online SDR receivers was somehow "cheating"---
but pirate radio stations are by definition "low-power" and thus good DX targets---
and I'd just as soon hear what they have to say as well as I can, from whatever receiver location---
especially since I no longer own a decent receiver, at the moment!     LOL

Many worldwide SDR receivers:
http://rx.linkfanel.net/


(Chris, of course your 'skyloop' SDR receiver remains one of my favorites--
but sometimes I can't get on it, and sometimes it seems it is just too far east! LOL but thanks for those!)




« Last Edit: April 18, 2025, 0333 UTC by John Poet »

John Poet

"A treasonous voice of dissent"
"I love the smell of a hot Johnson in the morning..."



The Crystal Ship Shortwave

On Twitter  https://x.com/tcsshortwave
.

Offline ChrisSmolinski

  • Administrator
  • Marconi Class DXer
  • *****
  • Posts: 32460
  • Westminster, MD USA
    • View Profile
    • Black Cat Systems
Re: Good old days
« Reply #37 on: April 18, 2025, 1338 UTC »
(Chris, of course your 'skyloop' SDR receiver remains one of my favorites--
but sometimes I can't get on it, and sometimes it seems it is just too far east! LOL but thanks for those!)

Thanks!

Right now, the KiwiSDR listed as using the 500 ft northeast beverage is actually connected to the sky loop also, as I have been having some intermittent issues with the feedline that I have been unable to pin down: http://sdr.hfunderground.com:8076/

It's still listed as connected to the Beverage, but that's a lie  ;D  If I can't easily resolve the issue, I'll change the listed antenna until I am able to fix it.
Chris Smolinski
Westminster, MD
eQSLs appreciated! csmolinski@blackcatsystems.com
netSDR / AFE822x / AirSpy HF+ / KiwiSDR / 900 ft Horz skyloop / 500 ft NE beverage / 250 ft V Beam / 58 ft T2FD / 120 ft T2FD / 400 ft south beverage / 43m, 20m, 10m  dipoles / Crossed Parallel Loop / Discone in a tree

 

HFUnderground T-Shirt
HFUnderground Garden Flag
by MitchellTimeDesigns