Question about Proton R5A Clock Radio

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Tuning drifts The radio is about 15 years old or slightly older. The problem is that while it can be tuned to receive a clear signal, it seems the tuning drifts and the sound becomes garbled and noisy. The radio can be retuned to receive a noise free signal but quickly changes to one with noise.

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  • 109 Answers

It sounds like the tuner is out of alignment. A number of things can cause this kind of problem. However, a realignment is a very costly proposition, especially when considering the used value of the Proton 320. If you really like this radio, you might want to try buying a used example off of eBay. They come up very frequently. Only... be selective. Don't pick anything from a seller without a lot of good feedback. And don't overpay ($50 tops).

Posted on Nov 07, 2010

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Posted on Jan 02, 2017

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Tuner reset
You can change the AM tuning scale to 9 KHz or 10 KHz. After tuning in any AM station turn off the receiver. Hold down the Preset tuning + and - ve together.
All preset stations will be erased when you change the tuning scale. To reset the scale to 10 kHz (or 9 kHz), repeat the procedure. If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/

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How Ido tune it l have no manual.Can you please help.many thanks


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I have a matsui MCH 750 mini hi-fi,i am having problems with the FM radio channels,sometimes or most of the time i get what seems like the channels are not tuned in properly or the aeriel is not good


If you're sure the FM signal strength at your area is good, the fault is with its AFT [Automatic Fine Tuning] system circuit inside the device. Contact any service technician to get it repaired. This is not a user repairable fault. http://electronicshelponline.blogspot.com/

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What's your problem?tuning in channels


tuning is a problem.see where the radio receives the best signal and set tuning according to that.

Apr 03, 2012 | Radio Communications

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New LG 32LD350 - Allowed TV to auto-program channels, and for some reason, it skipped past channel 4 during the tuning process. When I select channel 4 in the tuning options, it comes up as no signal. On...


When you are auto tuning the system will not store a channel which is week by its standard ( at least 60% signal strength ) This done to avoid grainy picture and hissy sound.
You can go into manual tuning and store it.

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1 Answer

Picture goes in and out


Hello,
This will require you opening the back cover of the television to test some component with the use of an ohmmeter.
This may be a slight drift - like someone is messing with the fine tuning
or such a substantial change in tuning frequency that the channels go by
as though you are surfing.

Possible causes depend on tuner type:

1. Quartz tuner (10 button direct access digital synthesizer) - For a
slight drift, a component is probably changing value, possibly the
crystal in the reference oscillator. For gross changes - flipping
through channels - it is more likely to be a digital control problem -
the microcontroller is misdirecting the synthesizer to change frequency.

2. Varactor tuner (buttons but not direct channel access) - If only a
single pushbutton selection is the problem, the the varactor tuning diode
for that button is probably changing capacitance. If all channels in
a band (Vl, Vh, U) are having a problem, it is more likely to be a
drifting D/A or faulty AFT (Automatic Fine Tuning) circuit or power supply.

3. Turret or switch tuner (Knobs) - A component like a capacitor is changing
value.

You will have to get in there with a heat gun or cold spray and track it down
the old fashioned way. At least, the problem is almost certainly localized
to the tuner box (and possibly the controller if applicable).

As noted, gradual slight changes in tuning are likely due to frequency
determining components drifting.

Uncontrolled channel surfing is probably a logic problem. For the
quartz tuner, this could still be marginal connections causing the
microprocessor to misdirect the synthesizer to change channels.

For the latter case, particularly, the cause may still be bad connections
resulting in loss of channel memory and/or erratic behavior.
Take care...

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What is a digital pll fm modulator


Hello towturtle,

An FM modulator is a little box that plugs into your receiver antenna connection. It sends a low-level signal directly to the radio which you then tune in on the FM band just like a radio station. They're handy for older receivers that do not have AUX, USB, or iPod inputs. You plug your device into the modulator and it plays through the receiver. The "PLL" just means that the tuning uses a technology called "phased lock loop" which keeps the frequency from drifting.

Hope this helps.

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Have to turn tv on and off to get picture


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Cobra 29 delta tune


For normal operation, set this control to the center position.
This feature has several uses and can help receiver operation.
If a received signal is slightly off frequency, the Delta-Tune control can be used to òfine-tuneó your receiver. Fine tuning is accomplished by listening for a more readable signal at the speaker or by noting the Smeter reading when the Delta-Tune control is operated. Another use of this control is eliminating adjacent interference (bleed over from other channels). If an exceptionally high level signal from an adjacent channel is creating interference on the channel being used, the Delta-Tune can be used to minimize or eliminate the interference. Rotate the control until you obtain minimum adjacent channel interference. NOTE: Delta-Tune is operable only in the receive mode.

It doesn't actually help receive any better, just can help kinda like a clairifier.

Dean Pitts
Rollin CBs
Mt. Vernon, TX

May 19, 2008 | Cobra 29 LTD CB Radio

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