If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
|
Thread Tools | Display Modes |
#1
|
|||
|
|||
Common speaker for vario and radio
Electronics guru's,
Can I use 1 speaker for both by radio (Becker 3201) and vario (LX160). Both call for a 4ohm speaker. Would connecting both to one speaker still work ? Would it be too quiet ? Any chance for damage to the radio or vario ? Thanks Todd Smith 3S |
#2
|
|||
|
|||
Can I use 1 speaker for both by radio (Becker 3201) and vario (LX160).
Both call for a 4ohm speaker. Strictly speaking no. Would connecting both to one speaker still work ? No Would it be too quiet ? That's not the problem Any chance for damage to the radio or vario ? Very much so. There are a couple of options 1 - A 2 channel mixer and reamplifier driving one speaker. 2 - Feed the vario audio ( suitably attenuated ) into the audio / intercom input of the radio. The radio amplifier then drives the speaker with the vario audio until the radio breaks squelch and you hear the radio signal. 3 - Simplest solution ........... Two speakers. Ian |
#3
|
|||
|
|||
NO........
not unless you want to replace the Becker radio and Variometer....and maybe the speaker too ) tim -- Wings & Wheels www.wingsandwheels.com "toad" wrote in message ups.com... Electronics guru's, Can I use 1 speaker for both by radio (Becker 3201) and vario (LX160). Both call for a 4ohm speaker. Would connecting both to one speaker still work ? Would it be too quiet ? Any chance for damage to the radio or vario ? Thanks Todd Smith 3S |
#4
|
|||
|
|||
A solid resounding NO it is!
I won't do it. In fact I alleady have 2 speakers, I was just trying to reduce the amount of stuff in the glider. Thanks a bunch Todd |
#5
|
|||
|
|||
Todd,
Glad you aksed the question. I suspected that the answer was no, but since I only get audio from the speaker connected to my LX5000 on every other flight, I was wondering whether a one-speaker solution was feasible. (When the LX5000 fails to give me audio I just crank up the B-40, but it has a problem too ... if a gust or a thermal pushes it over 10 knots, the audio "latches" onto that max tone and stays there until another max gust frees it somehow, or I cycle it off and back on.) ted/2NO chandler az toad wrote: Electronics guru's, Can I use 1 speaker for both by radio (Becker 3201) and vario (LX160). Both call for a 4ohm speaker. Would connecting both to one speaker still work ? Would it be too quiet ? Any chance for damage to the radio or vario ? Thanks Todd Smith 3S |
#6
|
|||
|
|||
|
#7
|
|||
|
|||
The Becker 4201 transceiver has an "auxiliary" audio input, where you can
bring in an external audio signal. I do not have a manual for the 3201 and do not know if it has the same feature. The 4201 specifies the input at 600 ohm of 1-8 volts, and the level is adjusted with the 4201 in "service" mode. Normally, speaker outputs are specified at 4 ohms. The mismatch between the Becker and the audio output is not a problem - as long as you can generate enough voltage to develop at least 1 volt. This could be done by putting a 16 ohm resistor across the vario. If you can generate 62 mw of audio across 16 ohms, yu can develop 1 volt of audio. If enough drive voltage is not developed, you can use a 4 ohm to 600 transformer to step up the voltage. I would put a 1000 ohm load resistor across the secondary, just to insure some load. But, the 3201 may not have anything like this. If the 3201 does not have an auxiliary input, you can still utilize 1 speaker by building a small universal audio amplifier, with various inputs that are joined (and properly isolated). Some airplanes use just such an audio panel. An LM-386, with multiple inputs could be used. I think Radio Shack has a book of simple circuits that has just such a schematic. If none of these options are available, a very small speaker can be used for the vario. Since it is a high audio frequency, tiny speakers will work fine. Rip one out of an old desktop computer. Colin N12HS |
#8
|
|||
|
|||
COLIN LAMB wrote:
If none of these options are available, a very small speaker can be used for the vario. Since it is a high audio frequency, tiny speakers will work fine. Rip one out of an old desktop computer. A pilot truly determined to eliminate the vario speaker should also consider buying a vario with an internal speaker. A simple option, but more expensive! What I'd like to "eliminate": * the EDS oxygen controller/switch box - I wish it had a small controls panel (switches and LEDs) I could mount on the instrument panel, with the main box stuck in back with the oxygen bottle * the headphone controls/battery box - I wish it was all contained in the headphones (headphones, you ask? I fly a motorglider) * the outside air temperature meter - the OAT is also available on my 302 vario, but it's about 10 button presses to get to it (some day I'll persuade Team SeeYou to make it a Navbox readout on SeeYou Mobile!) These changes would reduce the "clutter" a bit. -- Change "netto" to "net" to email me directly Eric Greenwell Washington State USA |
#9
|
|||
|
|||
Eric Greenwell wrote:
* the outside air temperature meter - the OAT is also available on my 302 vario, but it's about 10 button presses to get to it (some day I'll persuade Team SeeYou to make it a Navbox readout on SeeYou Mobile!) The OAT meter is required for certification of German gliders equipped with water ballast, and is therefore required under the US type certificate. So, it can't be eliminated, unfortunately... Marc |
#10
|
|||
|
|||
Earlier, Marc Ramsey wrote:
The OAT meter is required for certification of German gliders equipped with water ballast... [slight thread hijack] Has anybody on this forum ever, ever looked at the OAT guage and said, hey, it's too cold here, I'd better dump water or descend? Given how effective composite sandwich construction can be as an insulator, it seems to me that what they _should_ be requiring is a ballast temperature guage... Bob K. http://www.hpaircraft.com |
|
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
(sorta OT) Free Ham Radio Course | RST Engineering | Home Built | 51 | January 24th 05 08:05 PM |
(sorta OT) Free Ham Radio Course | RST Engineering | Piloting | 43 | January 24th 05 08:05 PM |
Portable XM Radio receiver in the cockpit? | Peter R. | Piloting | 13 | September 4th 04 03:46 AM |
1944 Aerial War Comes to Life in Radio Play | Otis Willie | Military Aviation | 0 | March 25th 04 10:57 PM |
Ham Radio In The Airplane | Cy Galley | Owning | 23 | July 8th 03 03:30 AM |