I have a rather old Marconi 2951 radio test set which I keep for a back-up.
It has developed a fault in that the frequency lock function will not work. If the lock is set to off the frequency generated is stable. However engage the frequency lock in the fine or course setting mode and the lock light flashes on an off and the generated frequency bounces around plus/minus 0.5MHZ.
The unit also seems to be running quite hot?
Possibly a power supply problem - check current drawn from the power line compared with your other 2951. any disturbance in power supply voltages can kill the afc/pll in older service monitors. if you have the manual check the ps voltages
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Many people were involved in the invention of radio as we know it today. Experimental work on ... Around the turn of the 20th century, Guglielmo Marconi developed the first apparatus for long distance radio ..... One year after the above experiment in public, he received his first patent from the Brazilian government. It was ...
you have wired the positive switched power or memory wire to the illuition wire on the old radio harness use a test light to check which wire red or yellow off the back of the radio is getting power with you have the lights set to parkers leave the key out for this test so you can easily find the wire your after once you found the wire getting power switch the lights off if the power switches off that is the fault
hope this helps good luck
cuts out ? well, all FM radios cut out for.: 1: weak station. 2: stereo can not be held in properly( can be bypassed on most RAD , pick mono) 3: AGC drop out, same as #1
on better radios (RTM) you can defeat these default features. set the FM to mono channel mode, and now you hear all stations. also kill the AGC mode. this allows you to hear the station. and static or both. like a Marconi radio of days of old. modern radios are programmed to blank weak stations. tis a fact. im a tech and tuned these features, for 50 years.
ok the fix, 1: move closer to station 2: get a better antenna (vast choices) 3: go to station and turn the gain knob up and get arrested by FCC.
If it is a 791 instead of a 79, check here: http://bama.edebris.com/manuals/marconi/
you may find a similar model.
If it is a Marconiphone, http://www.nostalgiaair.org/Resources/246/T0000246.htm Although there were some Marconi models that may not be int he Nostalgia Air database for any number of reasons, partly due to the fact Rider usually put them in with the Miscellaneous models.
Other possible sources could be in the various "Shortwave guides" that were published in that era- many included schematics from the manufacturers. Lindsay publishing has reprinted 1936 and 1937, whether they are still available is tough to say, but you can check the listing of what Lindsay publications has on hand at http://www.lindsaybks.com just look for the book list.
My own suggestion- Recap it completely first. Then check the resistors to make sure none are outside of the tolerances- usually 20 percent. From there, tweak the IF;s and the radio should come to life even with weak tubes.
If you are in the UK, or Europe, there should be a few dedicated museums that may have the schematic available as well- just use search engines less used. In other words- forget google or bing- Although google.de or google.it might give you some hits if the radio is not of US manufacture.
hi, if you are using prepaid account you must have more than 50 pesos load to activate your GPRS setting...then do this procedure...., GO (space)N6610i then send to 2951 (all letters must be capitalized),you will received a confirmation from 2951 that your gprs is already activated.. To test if your gprs is working ,send a pic to your own number ..if you received the image ,your gprs is activated...to prevent deactivation of gprs setting ,your load balance must be always more than 50 pesos all the time. i hope it will help you ,thanks for trusting fixya...