Question about RCA 27F530T 27" TV

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No uhf on rca t.v. ctc175.

The voltage on u7301 the osc mix changes from 3v for vhf to 0v for uhf .
i changed the osc mix and uhf rf amp but still only get faint video and
no audio on uhf.
i get agc on g2 but nothing on the other 3 pins,all supply volatges are ok.
when i put the meter probe on the drain of u7101, the picture come in.
i did the grounds on the tuner but still no change.
the voltages on pin 7,8,and 14 increase as i increase the channels.
the problem appear to be the mising voltages on q7107.
i thank u in advance of your reply.

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2 Answers

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Change the osc mix again may be other one have some prob again.

Posted on Jan 16, 2008

  • Waqar Khurshid
    Waqar Khurshid Jan 27, 2008

    did you change the osc?

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1 Answer

What does RF CH mean?


What is the difference between a RF channel and a virtual channel? The RF channel is the channel that the TV station uses to broadcast its signal. Before the conversion to digital, TV stations were normally identified by their channel number, and most people knew that a particular network was on a specific TV channel. While analog broadcasting was being phased out and all TV stations were converting to digital broadcasting, it was necessary for the TV stations to continue to broadcast their analog signals on their original RF channels, and also broadcast their digital signals on a different RF channel. However, since the TV station used their broadcast channel as part of their identification, they wanted to keep using the same channel number. To allow this to happen, the new digital television broadcasting standards (ATSC) provided TV stations the ability to continue to use their original channel number and also tell the TV set to tune to the new RF broadcast channel when their virtual channel number was selected. The original channel number is called the virtual channel number, and it will be followed by a period and a second number (3.1, 7.1, etc.).
One of the benefits of converting to digital for the TV stations is that they now have the ability to transmit more than one program at the same time on the same RF channel. The number of additional channels they can broadcast is determined by the resolution of the program (SD vs. HD, text only, music only, etc.). The second number in their virtual channel number indicates that one of the additional programming sources from the same TV station is being viewed (10.2, 10.3, 10.4, etc.).
When selecting an antenna, it is important to understand the difference between the RF broadcast channel and the virtual channel. Antennas are designed to receive specific ranges of RF channels, and the antenna needs to be selected for the RF channel you wish to receive. TV stations broadcast in two broad frequency ranges, called VHF and UHF. RF channels 2 through 13 are considered VHF, and RF channels 14 through 51 are considered UHF. In order to pick up the channels, the antenna has to be designed for the correct frequency range. It is very common today to find that TV stations using virtual channels 2 through 13 are actually using RF broadcast channels in the UHF range. Although not as common, some TV stations using virtual channels 14 through 51 are actually transmitting in the VHF range. An antenna designed for only UHF channels will not work effectively for RF broadcast channels in the VHF range, and an antenna designed for only VHF channels will not work effectively for RF broadcast channels in the UHF range.

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1 Answer

Okay, here I am again, wanting to know how to add cable channels to my Hitachi C21 F800S TV. It currently only shows one channel, BET. Please help! Thanks!


1 Press menu button to enter the menu screens for the following optional adjustable settings.choose
2-tune
3-AUTO SEARCH (Activate to auto search & preset receivable broadcast stations)

-if it don't work change this
4Press menu button to enter the menu screens for the following optional adjustable settings.choose
5-tune
6-BAND (change the band system for tuning (i.e. VHF-L,VHF-H or UHF).

if VHF-L don't work try VHF-H or UHF and restart all over

good luck

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1 Answer

VHF/UHF RF Power falls to Zero when the Auto ATU tunr logo is on the display. When the tunr logo is off the VHF/UHF RF power is only 10 watts on 2M and 3 watts on 70cms. The Yaesu FT 857 D should have no...


Check for open or shorted Veractor diodes and steering diodes there may be no direct interaction as you say but if a diode is open or shorted the RF circuits might still be selected for the higher bands and the lower output power on your vhf/uhf is an indication of this.
If you do not have a service manual you can get one hear, you will likely kneed one
http://www.tradebit.com/filedetail.php/127575994-vertex-yaesu-ft-857-ft-857d-2005-service-repair
Good Luck Best regarsds Falco

Nov 04, 2013 | Yaesu FT-857D transceiver

1 Answer

Dvdr3320v will this model record digital tv programs


This device has 2 composite AV, 1 S-Video, 1 Firewire, 1 RF video inputs. The RF input is a way for it to accept a signal from say a VCR's or Video Game's output on Ch 3 or 4.

Your device also can record via internal tuner.. The tuner can tune VHF:2-13, Cable:1-125 and UHF:14-69. Unfortunately, if you only have a UHF / VHF antenna on your house for TV (do not have cable TV, satellite TV, or the like) you're not going to be able to find anything due to the change from analog TV to digital TV. For this, you would need to purchase a digital TV converter box, and put the output of it into the the DVDR3320V.

I hope this helps and good luck. Please rate my reply. Thanks.




May 06, 2011 | Philips Televison & Video

1 Answer

Have just bought a hardly used sega megasystem 2 console but it doesnt seem to work. does anyone know where all the leads etc should go? thanks


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Mar 20, 2010 | Sega Master System Console

1 Answer

I need help setting up my Sega Master System, I am unable to attatch it to the tv.


Hi, Sega master system 2 are connected to your TV via an RF cable. One end is RCA which connects to your console the other end is Pal which connects to you TV's antenna inlet if your using the sega RF switch then the RF switch connects to your antenna inlet on your TV and you should have a RCA to RCA cable which connects the console to the switch. Please note these cables and power adaptors can in some cases be faulty. These console are manually tune to VHF-1 frequency so make sure your TV has this frequency. some do tune to UHF but most tune to VHF-1 if you need parts or want your console modified to connect to a modern TV via AV inlets or S-video visit www.gameoz.com.au they stock a huge range.

Jan 30, 2010 | Sega Master System Console

1 Answer

Rca t.v. ctc175


Are you sure you have the set in the antenna mode rather than the cable mode ?

Feb 13, 2008 | RCA 27F530T 27" TV

1 Answer

Will not show channels below 51


The GE (actually RCA) 35GT690 uses the CTC187 series chassis. The tuner uses the VHF circuits for cable channels lower then 51 and the UHF circuits for the higher channels. This means that the VHF circuits have stopped working in your set. I usually find that this is caused by a defective U7301 IC in the tuner, the SIP IC labeled CXA1594L. This is a very difficult IC to change and all tuner ground solder joints should be resoldered too, so that should be done by someone with experience in the CTC187 chassis.

Jul 05, 2007 | GE 35GT690 35" TV

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