The board comes assembled. I then took the board and modified the audio input by removing two resistors on both the left and right channel which were in originally there to attenuate the audio signal; I do this to give the input more audio gain.
I install EMI filters on both audio inputs and also on the power + and - sides so no EMI will reinter the board. I then I install a 100 K audio tape volume control for controlling audio gain, a LED for a pilot light, the RCA input jacks, , the F59 antenna connector, a power switch power connections.
The board is mounted on brass standoffs and installed in an aluminum enclosure. The enclosure is polished to give the transmitter a final touch! True the frequencies are limited; however the BH 1417 with this arrangement will give less noise in the transmitted signal when compared to the BH 1415 which will have an external controller to provide full band coverage.
It all depends on how well the designee is for the BH 1515 transmitter. I own some that are very clean, but those were manufactured with metal shielding covering noise eliciting compotes so it’s possible to have a nice quiet BH 1417 transmitter.
I like this particular board because of a healthy power output, nicely laid out components and the board is quality constructed. Some of the BH 1415 boards will not oscillate on the lower frequencies, this one will. I am not sure of the reason for this but it can be corrected by adding a “sliver” of ferrite inside the oscillator coil to up the inductance then the lower frequencies will operate. When doing this the bras screw must be removed first.
I see there were some typo errors,the spell checker does not always correct as a person might think it will so I re did the response, sorry for the extra post.
The board comes assembled. I then took the board and modified the audio input by removing two resistors on both the left and right channel which were in originally there to attenuate the audio signal; I do this to give the input more audio gain.
I install EMI filters on both audio inputs and also on the power + and - sides so no EMI will reinter the board. I then I install a 100 K audio tape volume control for controlling audio gain, a LED for a pilot light, the RCA input jacks, , the F59 antenna connector, a power switch power connections.
The board is mounted on brass standoffs and installed in an aluminum enclosure. The enclosure is polished to give the transmitter a final touch! True the frequencies are limited; however the BH 1417 with this arrangement will give less noise in the transmitted signal when compared to the BH 1415 which will have an external controller to provide full band coverage.
It all depends on how well the designee is for the BH 1415 transmitter. I own some that are very clean, but those were manufactured with metal shielding covering noise emitting components so it’s possible to have a nice quiet BH 1417 transmitter.
I like this particular board because of a healthy power output, nicely laid out components and the board is quality constructed. Some of the BH 1417 boards will not oscillate on the lower frequencies, this one will. I am not sure of the reason for this but it can be corrected by adding a “sliver” of ferrite inside the oscillator coil to up the inductance then the lower frequencies will operate. When doing this the brass screw must be removed first.
Radio Joe
Sterling Quality
Speaking as one who has built electronic devices from component parts it is obvious, Joe, that your building skill is superlative. The neatness of your finished product is in the highest class.
THANK YOU!
It takes time and patience; believe me, and very careful layout.
One of my installations:
I want to share with the other members of the group one of my “installations” at my home; this one located in my work shop.
In this arrangement are Three FM stereo transmitters and one TH5 AM transmitter. I can run audio from a nearby computer or use the car stereos you see as an audio source.
The car stereos have USB inputs so I can put in a flash drive and your set to go! These have line outs on the back of the radio and I also have line out converters from the speaker outs, I can pick whatever works best, I chose the line outs right now because of higher level output. Each transmitter has its own AGC control for audio; I use the SIMA SVS 1 or SVS 1A volume stabilizer for that purpose.
I also have an SVS-4 audio/video switcher that I use for selecting just audio from satellite audio or the computer audio or Hi If VCR, which is not shown its located in another nearby cabinet. Each transmitter has its own volume control.
Two of the transmitters are BH 1417 and one is BH 1415. The 1417 ones are boards I outfitted with connections and cabinets. Antennas for each transmitter are dipole type. I am running those without a matching transformer at the antenna.
This arrangement better matches the 75 ohm coax but doesn’t feet the antenna with a balanced input so this is a compromise, but I found I can tune the antennas by varying the rod lengths for a nice peak on a single strength meatier so I guess I just got lucky on the antennas. I make sure my transmitting distance is less than 200 feet - of course you guys know that this is what we are supposed to do!
The AM antenna/loading coil for this transmitter is located outside the house. Just an overview! Pictures are from a 1.5 MP camera so they don’t show nice detail or full glory of the setup, but give everyone a full view. I know it dont look like BIG MARKET but to me it means something.
Radio Joe
I forgot to mention, (you get old you forget!) the antennas for the FM transmitters are in the attic of my home. I also should mention there are actually 4 FM transmitters in the cabinet If you look towards the upper left hand corner you can see and "official' painted rod antenna. This FM transmitter is just a inside the house one which has a very short untuned antenna.
Radio Joe
Museum Quality
There are many BIG MARKET radio stations that are not anywhere as organized as what we see in the pictures.
The shelving is made from an interesting material, maybe particle board?
Come to think of it I am practically within sight of a "big market" but there's not much to see compared to yours.
The charts and instructions filling blank spaces is something never seen anywhere else.
Interesting using car stereos as audio source! That's a first I think, that I've seen.
If not a copyright violation you could rebroadcast a program from the radio.
Yes, looks very nice.
Well, far as materials, and how I went about it, that setup was built up as I went along and added equipment, so it was a build as you go process. If I had a choice I would put it in some kind of cabinet that you could get at the back of, right now if you have a bad connection on the bottom some place you have to almost pull all the stuff out starting from the top! It has occured a couple of time and its not fun, but its always a chance to revamp things.
Thank yo both for the compliments!
Blocking Our Own Access
Radio Joe said: "If I had a choice I would put it in some kind of cabinet that you could get at the back of."
Exactly the problem I have here at KDX. The heart of the wiring is trapped in a corner with no way to reach it without hanging from the ceiling. Whenever I need to make a change we almost have to dismantle the whole house.