Search found 36 matches

by vacuum tube
Thu Dec 07, 2017 9:47 am
Forum: FM Radio
Topic: Singling out 2 stations on same frequency
Replies: 7
Views: 406

Re: Singling out 2 stations on same frequency

This will probably be a moot point for the OP. I see there is a CP for a 110 watt translator in Baltimore on 106.9, so that will probably wipe out any DX on that frequency locally when it comes online. DX ing on FM broadcast is becoming a thing of past with all the translators going on the air. More...
by vacuum tube
Wed Dec 06, 2017 8:26 am
Forum: FM Radio
Topic: Singling out 2 stations on same frequency
Replies: 7
Views: 406

Re: Singling out 2 stations on same frequency

My guess is that if you can receive that fringe a signal at all someone will be putting a translator on that frequency in your local area before long. From my experience those cheap antenna are a "you get what you pay for" JUNK! The built in amplifiers are noisy and very easy to strong signal overlo...
by vacuum tube
Tue Nov 28, 2017 10:01 am
Forum: Ask the Engineers
Topic: Offical AMC 8 Transition Thread (was Sat. AMC-8)
Replies: 153
Views: 11417

Re: Offical AMC 8 Transition Thread (was Sat. AMC-8)

It appears from my receiver logs the switch was made this morning...around 3:09AM EST for Westwood One and 6:09 AM EST for Premiere. I am getting about a DB or so better E/B on Westwood (12.8 is up to 14). Premiere was already maxed out at 15+. Curious to see if anyone else noticed. Using a 3.8 mete...
by vacuum tube
Tue Nov 07, 2017 8:47 am
Forum: FM Radio
Topic: OMB PTX-20 test and repair help required
Replies: 15
Views: 484

Re: OMB PTX-20 test and repair help required

Guessing the POT AJ is the power out adjustment.
by vacuum tube
Tue Nov 07, 2017 8:46 am
Forum: FM Radio
Topic: OMB PTX-20 test and repair help required
Replies: 15
Views: 484

Re: OMB PTX-20 test and repair help required

I would guess the 50 watt scale is for forward power and the 5 watt scale is for reflected power. It looks like the toggle switches between the forward and reflected reading. Does one of the pots adjust the power output????
by vacuum tube
Tue Aug 22, 2017 7:53 am
Forum: AM Radio
Topic: Bleed over
Replies: 7
Views: 689

Re: Bleed over

The red flag here is both transmitters limited to 750 watts. Are the transmitters folding back due to VSWR? If you have a dummy load put it on one transmitter at a time and see if they make power on the dummy load, or turn one transmitter off and see if you are able to make power with the transmitte...
by vacuum tube
Mon Aug 14, 2017 7:16 am
Forum: AM Radio
Topic: RCA BTA1M transmitter
Replies: 13
Views: 1313

Re: RCA BTA1M transmitter

They started using the 4-400's in the BTA 1R1 which I believe came out in 1959 or 60.
by vacuum tube
Tue Aug 01, 2017 2:14 pm
Forum: FM Radio
Topic: EAS Antenna Issue
Replies: 13
Views: 1124

Re: EAS Antenna Issue

Good point w9wi, the Sony HD radios and tuner are amazing analog receivers. I am sitting right under the antenna for a 250w translator on 98.9 and can receive 98.7 60 miles away with no problem. The Sony XDR-F1HD tuners can bit found on ebay but they sell for more than what they cost new.
by vacuum tube
Tue Aug 01, 2017 12:27 pm
Forum: FM Radio
Topic: EAS Antenna Issue
Replies: 13
Views: 1124

Re: EAS Antenna Issue

Instead of pointing the yagi at the intended signal(104.9), you might try pointing it so the deepest side null is to the offending signal(105.1). That might work otherwise a notch filter may be in order. If the splitter has any amplification get rid of that.
by vacuum tube
Wed Apr 12, 2017 7:09 am
Forum: AM Radio
Topic: MW10B-A little help?
Replies: 16
Views: 1594

Re: MW10B-A little help?

The old broadcasters rule of thumb "we're going to save $1000 even if it costs $10000"
by vacuum tube
Mon Feb 13, 2017 8:52 am
Forum: FM Radio
Topic: FM Clock Radio with good blanketing protection recommendation
Replies: 7
Views: 836

Re: FM Clock Radio with good blanketing protection recommendation

The Sony HD radios are a clock radio and they were excellent, having the same tuner as the Sony XDR-F1HD tuner. The models were the XDR-S3HD and the XDR-S10HDIP. They are no longer made, but they show up on Ebay all the time. The Sony FM tuner in these radios is one of the best I have ever heard for...
by vacuum tube
Mon Dec 05, 2016 2:43 pm
Forum: FM Radio
Topic: Best LPFM antenna
Replies: 6
Views: 935

Re: Best LPFM antenna

My vote is for the Nicom BKG 77. I have a few, they work fine and are broadband to cover the entire FM band. Ice does not bother them and no wind load of radoms. The price is right as well. Depending on connector they are rated at 2 kw per bay.
by vacuum tube
Sun Oct 09, 2016 6:37 am
Forum: FM Radio
Topic: Phelps Dodge Antenna Rebuild
Replies: 15
Views: 1767

Re: Phelps Dodge Antenna Rebuild

I suggest you listen to the good advise you have been given. In my opinion you will save more money by installing a new Nicom broadband BKG 77-4 rather than trying to use what you have. It's a no brainer in my book. I would never install a 30+ year old antenna that may or may not work well when you ...
by vacuum tube
Wed Aug 17, 2016 2:16 pm
Forum: FM Radio
Topic: Whistling Birdie in FM signal
Replies: 29
Views: 2066

Re: Whistling Birdie in FM signal

Sounds like heterodyne from a weaker signal. Can you switch to a back up audio path when this happens and shut down the STL transmitter and listen to what is coming out of the STL receiver. I know that's kind of like asking for all the planets, moon and sun to align. You could just dump the STL tran...
by vacuum tube
Tue Feb 23, 2016 3:41 pm
Forum: FM Radio
Topic: ICE Prevention - Radomes or Electric De-icers?
Replies: 17
Views: 1480

Re: ICE Prevention - Radomes or Electric De-icers?

I would consider replacing the antenna with a broadband Nicom BKG77. Low cost, no extra wind loading of radoms and no power for heaters.
I diplex two translators into one with no problems of icing.