Radio Iran 7245 evenings

[WD8BIL]

I was listening above 7200 last night and came across a station on 7245 claiming to be Radio Iran.

After listening a bit I noticed a familiar thing. It seems there is a 50 cycle hum on the carrier!

Ya think they got that transmitter from Russia?

(or was it just my aging ears?)

[w3jn]

These are facts.

[KA1ZGC]

I've picked them up numerous times over the years, never noticed a 50 Hz hum.

There may well have been one, but I've never picked up on it.

[WD8BIL]

That's why I axed ifn it was my aging ears, Thom.

It wud be interesting ifn someone else confirms it.

[flintstone mop]

Iran musta purchased a new Continental 250KW unit.
I'll have to try to tune and listen

Fred

[WD8BIL]

It was right around 9:00 P.M. edst Phred.

[k4kyv]

I heard it a few nights ago, 50~ hum and all.

Hey, if we are listening to propaganda broadcasters on 40m, how about a little transmitting ~7160 in mid-evening?  I hear quite a few strong slopbuckets in that part of the band, but no AM.

[W2PFY]

What causes that 50 cps hum on those SW transmitters? Is it the filament source?

I remember Radio Moscow humming away. Too bad they stopped using those transmitters.

BC-610's are known for the hum problem when using the internal VFO. Strangely for whatever reason, the BC-610D that I now have on the air now, does not have it.

[k4kyv]

What causes that 50 cps hum on those SW transmitters? Is it the filament source?

Most likely the same thing that causes 60 cps hum on transmitters in this part of the world.  You hear plenty of it on AM ham signals.  In many countries outside of US and Canada, they don't have the strict technical standards for broadcast stations that we have here, so a lot of their broadcasters put out signals comparable to what hams put out here, complete with hum, distortion, overmodulation, undermodulation, etc. Just tune between 7200 and 7500 kc/s sometime.

[flintstone mop]

I heard it a few nights ago, 50~ hum and all.

Hey, if we are listening to propaganda broadcasters on 40m, how about a little transmitting ~7160 in mid-evening?  I hear quite a few strong slopbuckets in that part of the band, but no AM.

Good one Don,
I got to get away from the puter and maybe some family stuff and dial in 7160 or there abouts and make some RF happen.
When is mid-evening...........8ish, 9ish??

Phred

[k4kyv]

Before 0400 GMT.  That's  12 AM eastern daylight shopping time (10 PM CST to me).  At 0400 the broadcaster-jamming competition from east Africa starts up and wipes out a big swath in the middle of the supposedly broadcast-free portion from 7.1 to 7.2, including 7160.

Last night I noticed that Radio Ethiopia had moved from 7110 to 7120. At least they are still inside the FeeCee imposed no-man's land between the phone band and where most of the CW/data activity takes place.  The usual broadcaster with white noise jamming was running full blast on 7165 and of course wiping out 7160.  But I noticed more of what sounded at first like white noise, but upon closer examination, sounded more like digital hash. DRM maybe?  It centred on 7185, but pretty much made 7175-7195 unusable. Actually, too wide for DRM, or at least a lot wider than the hash on 3990-4000. This was about 0530 or 0600 GMT. Altogether, white jamming noise and digital hash were wiping out 7160-7170 and 7175-7195.

So, to answer Fred's question, I would call mid-evening the period between local sunset and 0400 GMT.

[wb1aij]

I was listening above 7200 last night and came across a station on 7245 claiming to be Radio Iran.

Is it an English language broadcast from Radio Iran? I've got to get away from the computer & TV & get back into Hamming & SWL. I am missing out on the things that used to intrigue me when I was a kid.

[WD8BIL]

Don: I did call CQ on 7160 a couple times...... no takers.

And yes, the broadcast was in English.