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August 19, 2017, 07:21:52 AM *
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 1 
 on: Today at 12:26:52 AM 
Started by steve_qix - Last post by ka1tdq
For National Radio Day, you don't actually get on the air (that's so 20th century; half serious-half joking).  Everything's virtual now.  If you're on Twitter or Instagram, use the hashtag #nationalradioday to post your picture and see what others posted.  

Anyone can do it and there's no thinking involved!  Why on earth do we bother building and figuring out this stuff that's so complicated? Sorry, not trying to start a conversation about this.

Anyway, let the carriers (and hashtags) fly!

Jon

 2 
 on: Yesterday at 08:04:35 PM 
Started by W1KSZ - Last post by K9PNP
Found this in my D-104 files.  Maybe it will help.  Presume you are using a G stand.

 3 
 on: Yesterday at 06:22:17 PM 
Started by k4rhh - Last post by k4rhh
FS  1- 4 section variable capactor from a HP 330B distortion analyzer.no name on cap but we all know HP did not skimp on quality when they made something.this measures 15-530 pf each section,this is mounted on a frame w/ smooth vernier  drive and the dial shows 20-200.this is 6 1/4 long and has a insulated coupling. this weighs 5 lbs and wont fit in a large flat rate box.but if you do not need the dial part i can remover the var cap,making it cheaper to ship. so if you need all send me your zip code. $15 plus ship  tnx RANDY K4RHH   rwcradiocollector  in va

 4 
 on: Yesterday at 05:58:36 PM 
Started by steve_qix - Last post by Steve - K4HX
So get all those National transmitters, receivers, transceivers and amps and get on the air. I'll have to dig out my NC-303.

 5 
 on: Yesterday at 05:40:01 PM 
Started by jimmy - Last post by jimmy
Looking for  a trade of Collins 75A4 w/Speaker for a Yaesu FT-102 in good working order or
a Malcomnized 102.  Please tell me what you have.
K5CSU

 6 
 on: Yesterday at 11:40:42 AM 
Started by W1KSZ - Last post by W1KSZ
I have read that there were earlier versions of the Super Senior and Senior AM Xmtr that ran lower power.
1500 Watts that the present one provides is a tad too much starch for these shorts so I thought I would
look for one that ran lower power.

So, first, were there lower power versions ?

And, second, does anyone have one they will part with.

Tnx, Dick, W1KSZ

 7 
 on: August 17, 2017, 10:27:46 PM 
Started by AJ1G - Last post by W6TOM
  When I was back visiting in MA last Fall I set up a station in my sister's basement family room, trying to listen to the 3885 military net I had RFI on frequency and it was every 100 KHz up and down, indicative of a switching power supply. My brother in law has a cordless modem and his cable modem right by where I was operating. I'm pretty sure is was the wall wart but it was behind a 6 foot tall entertainment center, not easy to move. I used the filtering in my transceiver which attenuated it enough to make it tolerable.

 This year I will bring some ferrites and try that. When I did RFI complaints for the local power company I often found this type of RFI source, a switching supply.

 8 
 on: August 17, 2017, 10:25:46 PM 
Started by K0RWM - Last post by K0RWM
For 35 years I served AM/FM broadcasting from 1961 to 1995.  I am clearing out my attic from gear we brought back to Nebraska City from both east and south coasts.  Lots of old memorabilia.  I do have photos of anything you may wish to see.  I have a Gates Yard audio console that went into service in 1958.  It is complete with the Gates Power Supply/Monitor Amp.  I have no idea what that may be worth.  Some of the things I need to find homes for: Gates Frequency Monitor (1959 vintage), Western Electric broadcast line equalizers, 111C repeat coils, B&W Distortion Analyzer, Audio Oscillator, Transmitter Manuals, NAB Engineering Handbooks, Ampex 601, Russco turntable and RIAA equalizer.  I am also aware of a former station no longer on the air but  containing all the gear I built in 1969 as 250W 3 tower directional.  There is a Visual and Collins transmitters, phasor, Potomac Phase Monitor,  and gear in the racks.  I would like to start a dialog with those on AM phone who may want some of the gear from the  good old days.

I am planning a flea market end of the month with fellow ham Tom K0TIK to clear the stuff out.  New to the AM Fone, I am not sure if I can promote things like that.  So I will leave it at that.
73,
Dave
K0RWM
Nebraska City, NE

 9 
 on: August 17, 2017, 10:08:40 PM 
Started by steve_qix - Last post by steve_qix
There is no doubt about it, you have to have safeguards in place - overload shutdowns, timers, SWR shutdowns - things like that.

Otherwise remote operation should definitely not be attempted  Cool

 10 
 on: August 17, 2017, 09:25:16 PM 
Started by W1KSZ - Last post by WD5JKO
I just got the Sept. issue of QST. Looking at k7dyy article, figure 3 says it is a 2 tone plot. Sure looks like a single 700 hz tone to me, with the 2nd harmonic down only about -24 db. That would be around 5% distortion at 100% modulation.

Jim
Wd5JKO

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