Search found 127 matches

by jammerdave
Mon Dec 21, 2020 6:25 pm
Forum: Ham Radio
Topic: Baofeng thoughts
Replies: 9
Views: 1060

Re: Baofeng thoughts

Just never look at a Baofeng (or similar) with a spectrum analyzer.... :lol:
by jammerdave
Fri Aug 30, 2019 7:12 am
Forum: Ask the Engineers
Topic: Marti Crystals
Replies: 6
Views: 1037

Re: Marti Crystals

Maybe just try BE? Awhile back, I called them for some 950 STL rocks, and they had them in stock. Maybe they might for RPU also?
by jammerdave
Wed Jun 19, 2019 9:39 am
Forum: FM Radio
Topic: Power Transistor
Replies: 3
Views: 525

Re: Power Transistor

Alternatives for that: http://www.mwpersons.com/tech-tips/FM/Continental-802A-rf-amp.htm http://www.broadcastconcepts.com/80watt/fmdriver/P50FM42.pdf Does anyone have a MRF315A NPN RF transistor they are willing to sell? It's for a Continental 802A and all I can find are a couple from China. Thanks ...
by jammerdave
Thu Aug 30, 2018 9:50 am
Forum: Radio Studio Engineering
Topic: Weird satellite problem
Replies: 9
Views: 1461

Re: Weird satellite problem

Premier has had ongoing problems for nearly a month or more. No word from them at all about it. Just crickets. Some of us have very low signal from that carrier, and folks like you have nothing. Go figure.
by jammerdave
Wed Jul 25, 2018 1:01 pm
Forum: Everything else
Topic: WKRP
Replies: 16
Views: 1519

Re: WKRP

CALL SIGN HISTORY WKRP-LP - 03/25/2014 Where this callsign has been: 08/17/1989 on 1460 in NORTH VERNON IN - now WJCP 09/19/1979 on 1500 in DALLAS GA - now WDPC 08/29/2011 On Channel 39 in COOKEVILLE TN - now DWKRP-LD 10/05/1998 On Channel 23 in WASHINGTON DC - now WDDN-LD 06/07/2005 On Channel 6 in...
by jammerdave
Wed Dec 27, 2017 4:48 pm
Forum: Ask the Engineers
Topic: AC Power Filters for the AM Band
Replies: 2
Views: 482

Re: AC Power Filters for the AM Band

http://www.morganmfg.us/radio-products/ac-line-filters-protectors/ OK, I'm at a loss. Does anyone know of a source for effective AC power line RFI filters that are effective in the medium-wave band (550-kHz to 1700-kHz)? They will, hopefully, be off-the-shelf and plug-in. 120-volt circuit protection...
by jammerdave
Wed Dec 27, 2017 4:45 pm
Forum: Ask the Engineers
Topic: AC Power Filters for the AM Band
Replies: 2
Views: 482

Re: AC Power Filters for the AM Band

Great question. I've always built my own with electronic surplus line filters in my own boxes/connectors. df OK, I'm at a loss. Does anyone know of a source for effective AC power line RFI filters that are effective in the medium-wave band (550-kHz to 1700-kHz)? They will, hopefully, be off-the-shel...
by jammerdave
Fri Sep 22, 2017 9:55 am
Forum: STL Engineering
Topic: Backup STL link
Replies: 8
Views: 3348

Re: Backup STL link

For that distance, I would think a 900 mhz data link on a couple of yagis would do the trick, even through some trees. Ubiquiti, or Mikrotik, and the like. I'm using Mikrotik radios diplexed into one of my STL paths, and it works great across the Sacramento metro out to south of rancho cordova. dav...
by jammerdave
Wed Aug 16, 2017 3:17 pm
Forum: STL Engineering
Topic: Backup STL link
Replies: 8
Views: 3348

Re: Backup STL link

Mikrotik Metal9HPn $108 each from streakwave. https://www.streakwave.com/itemdesc.asp?ic=RBMetal9HPn df I'm using Mikrotik radios diplexed into one of my STL paths, and it works great across the Sacramento metro out to south of rancho cordova. What model of MIkrotik are using? What did they cost?
by jammerdave
Thu Aug 03, 2017 8:44 am
Forum: STL Engineering
Topic: Backup STL link
Replies: 8
Views: 3348

Re: Backup STL link

For that distance, I would think a 900 mhz data link on a couple of yagis would do the trick, even through some trees. Ubiquiti, or Mikrotik, and the like. I'm using Mikrotik radios diplexed into one of my STL paths, and it works great across the Sacramento metro out to south of rancho cordova.

dave
by jammerdave
Sun Jun 18, 2017 9:24 am
Forum: Radio Studio Engineering
Topic: Small diameter balanced mic cable OK? Source?
Replies: 6
Views: 1394

Re: Small diameter balanced mic cable OK? Source?

https://www.sweetwater.com/store/detail/223B We have run a number of mic cables from one studio to another and the existing hole is small and difficult to expand. The balanced XLR mic cables I've used have been about 1/4 inch in diameter but I have seen XLR mics with ~1/8 inch dia cable. 1 - Is any ...