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Post by Night Ranger on Oct 5, 2014 10:38:53 GMT -5
This radio is the biggest bleed box I ever owned. My father purchased the "Morse CB-2000" version of this radio for Christmas of 1976 for my mother's car. The selectivity on the radio in easily the worst of any radio I have ever used. A kiddie walkie talkie down the street could co-channel this thing all the way around the band. I used this radio as a base while my Midland 23 channel 13-853 was in the shop being repaired. I toasted the Midland at age twelve after making my first "guess" at peaking a CB. I decided to learn more about electronics before making my next attempt. Having to put up with all the bleed-over while listening to this radio was punishment in itself. Vintage Fanon #330 23 Channel CB Transceiver www.ebay.com/itm/Vintage-Fanon-330-23-Channel-CB-Transceiver-Radio-NOS-in-Box-/311110141452?pt=US_CB_Radios&hash=item486f9c060cThis is the Morse CB-2000 version. www.shadowstorm.com/cb/Morse_Mobile_CB_Radios.htmlNight Ranger |
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Post by cbrown on Oct 6, 2014 9:28:09 GMT -5
The box for it looks like it was made by a 12 year old.  |
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Post by captbarry on Oct 8, 2014 20:47:26 GMT -5
I have never seen one of those before. I really under stand what you are saying about selectivity. Think the first radio I had in the car was a 23 ch Audio Vox. I knew nothing about radio at the time so I thought bleed over was a part of CB. Come to think of it guess it was but when I got a new Hygain I quickly found out what selectivity was all about, man what a difference! 73's all.
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Sandbagger
Administrator/The Boss 
Posts: 6,247 
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Post by Sandbagger on Oct 9, 2014 7:22:08 GMT -5
I have never seen one of those before. I really under stand what you are saying about selectivity. Think the first radio I had in the car was a 23 ch Audio Vox. I knew nothing about radio at the time so I thought bleed over was a part of CB. Come to think of it guess it was but when I got a new Hygain I quickly found out what selectivity was all about, man what a difference! 73's all. Dealing with the various forms of bleedover has been a chore for most of us back in the day. Some radios were really bad, and some were really good. The rest fell somewhere in-between. And it wasn't a simple matter of the more expensive the radio, the better the selectivity. You really had to know the design of the chassis that the various manufacturers used. Early Uniden boards were prone to intermod. Cybernet and GRE chassis were prove to RF overload. Panasonic tube chassis radios had great immunity from RF overload, but had weak adjacent channel rejection. High end radios like Tram and Browning base radios had great selectivity and immunity from overload. In the past several years, the issue of bleedover had been pretty scarce. There just aren't as many operators on as there were in the 70's. Ironically, our local area's operators, for whatever reason, managed to settle on 3 adjacent channels, while all the rest are basically quiet. So now the bleed issues are back with a vengeance......  |
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Post by Night Ranger on Oct 9, 2014 9:51:04 GMT -5
I have never seen one of those before. I really under stand what you are saying about selectivity. Think the first radio I had in the car was a 23 ch Audio Vox. I knew nothing about radio at the time so I thought bleed over was a part of CB. Come to think of it guess it was but when I got a new Hygain I quickly found out what selectivity was all about, man what a difference! 73's all. Dealing with the various forms of bleedover has been a chore for most of us back in the day. Some radios were really bad, and some were really good. The rest fell somewhere in-between. And it wasn't a simple matter of the more expensive the radio, the better the selectivity. You really had to know the design of the chassis that the various manufacturers used. Early Uniden boards were prone to intermod. Cybernet and GRE chassis were prove to RF overload. Panasonic tube chassis radios had great immunity from RF overload, but had weak adjacent channel rejection. High end radios like Tram and Browning base radios had great selectivity and immunity from overload. In the past several years, the issue of bleedover had been pretty scarce. There just aren't as many operators on as there were in the 70's. Ironically, our local area's operators, for whatever reason, managed to settle on 3 adjacent channels, while all the rest are basically quiet. So now the bleed issues are back with a vengeance...... Of all the CB radios I have owned the one that is the BEST at rejecting bleedover is really just a plain looking CB, but it has crystal and ceramic filters right out of the box. The manufacturer rates the selectivity as 80db @ 10kHz. ..and here it is; The Realistic TRC-422a www.shadowstorm.com/cb/rigs/Realistic_TRC-422A-new.jpgYou can forget about extra channels with this radio. If the radio is off frequency from age you can replace ceramic capacitor C36 with a small trimmer capacitor to bring the 10.240 MHz crystal back on frequency. It is actually a nice little radio for what it was designed to do. Clipping D16 and D17 opens up the transmit audio, but you need to go easy on the amplified mic gain or you'll be the one splattering. ..and here are the specs... This is the 1979 Radio Shack catalog online. Go to page 158 to see the TRC-422a and the receiver specifications. www.radioshackcatalogs.com/catalogs/1979/Night Ranger |
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Sandbagger
Administrator/The Boss
Posts: 6,247
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Post by Sandbagger on Oct 9, 2014 10:00:57 GMT -5
Dealing with the various forms of bleedover has been a chore for most of us back in the day. Some radios were really bad, and some were really good. The rest fell somewhere in-between. And it wasn't a simple matter of the more expensive the radio, the better the selectivity. You really had to know the design of the chassis that the various manufacturers used. Early Uniden boards were prone to intermod. Cybernet and GRE chassis were prove to RF overload. Panasonic tube chassis radios had great immunity from RF overload, but had weak adjacent channel rejection. High end radios like Tram and Browning base radios had great selectivity and immunity from overload. In the past several years, the issue of bleedover had been pretty scarce. There just aren't as many operators on as there were in the 70's. Ironically, our local area's operators, for whatever reason, managed to settle on 3 adjacent channels, while all the rest are basically quiet. So now the bleed issues are back with a vengeance...... Of all the CB radios I have owned the one that is the BEST at rejecting bleedover is really just a plain looking CB, but it has crystal and ceramic filters right out of the box. The manufacturer rates the selectivity as 80db @ 10kHz. ..and here it is; The Realistic TRC-422a www.shadowstorm.com/cb/rigs/Realistic_TRC-422A-new.jpgYou can forget about extra channels with this radio. If the radio is off frequency from age you can replace ceramic capacitor C36 with a small trimmer capacitor to bring the 10.240 MHz crystal back on frequency. It is actually a nice little radio for what it was designed to do. Clipping D16 and D17 opens up the transmit audio, but you need to go easy on the amplified mic gain or you'll be the one splattering. ..and here are the specs... This is the 1979 Radio Shack catalog online. Go to page 158 to see the TRC-422a and the receiver specifications. www.radioshackcatalogs.com/catalogs/1979/Night Ranger It's hard to say what my best "bleed fighters" were. If you were talking more than 5 channels away from a really strong (like down the street) station, my Comstat 25 really shined. For more adjacent channel splash, the Hy-Gain 623 had the sharpest bandwidth of any of my radios. The Tram Titan has a Collins filter in it which gives it superior performance as well. Both the Tram D201 and the Browning MK III were rated at -80db for rejection, and they were also pretty resistant to RF overload, and intermod. But nothing will help you if the station that's bleeding you, is splattering badly. You can't "reject" on-channel crud caused by a poorly setup transmitter on an adjacent channel. |
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Post by captbarry on Oct 9, 2014 21:08:31 GMT -5
Right you are, some of the most basic radios I had were the best at dealing with bleed over. No surprise my Mark III and Mark IVA are the best radios I have owned dealing with interference. I had a TRC 422A years ago that was in my wife's truck., good basic radio which is all she ever wanted. These days she runs a Texas Ranger TR-127 FS in her pickup. She likes the pretty face plate on it but it isn't a bad radio, has pretty good audio. I always thought my Teaberry Model T and the Robyn T 240 D were pretty good at dealing with bleed over.
Now not that sure since I was living in Delaware then just off I-95 and there were three truck stops within a mile of me! Man that was tough!!!!!! Out in the country here in Cecil County Maryland and about five miles from the nearest truck stop. Great thread guys, thanks for keeping the board going!
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Post by cbrown on Oct 10, 2014 9:08:50 GMT -5
My Hy-Gain 623 was great for bleedover.
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