jdobbs2001
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Texas star makes CW amplifiers for 10 meters if you need to run more power to get that CW out of the Mud. 
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So Called 10M CB radios
- Thread starter Dawn
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K4PIH
Member
As you can tell by the call, I'm a ham AND I still CB! Started out in CB back in the early 70's when everybody else in my family was a ham .. talk about catching flak! I have both in my shack (QRZ.COM) and when the thugs get too raunchy or start jamming too much on 40 and 80, I go CB to chat local with my friends. Back in the early 80's i converted a number of CB's to 10 meter ham. They actually worked pretty well. I have an HTX 100 1 in the shack now because it's just a good little 10 meter rig and I run it through a converted 5/8 wave CB ground plane that has to be 30 years old if a day.
It's all good fun and remember radio is a hobby, not a religion.
73
It's all good fun and remember radio is a hobby, not a religion.
73
As I understand it, the HTX-100 is a pretty good radio. It is a close relative of my President HR2600...both made by Uniden. The reason I chose the President is because it has AM and FM modes the Radio Shack doesn't have. Mine has never been modified...tunes from 28.0 to 29.699...and outputs the stock 25w PEP (10w AM & CW).
I find 10 meters to be an interesting and challenging band. I've worked 55 countries and all six of the ARRL "continents." And even during the summer band "closure" I still find people to talk to occasionally.
I've encountered a few idiots...those who like to whistle or blow into their mics, run their keyers continuously or generate other electronics noises...but overall I like 10 and don't miss being on the other HF bands at all.
I find 10 meters to be an interesting and challenging band. I've worked 55 countries and all six of the ARRL "continents." And even during the summer band "closure" I still find people to talk to occasionally.
I've encountered a few idiots...those who like to whistle or blow into their mics, run their keyers continuously or generate other electronics noises...but overall I like 10 and don't miss being on the other HF bands at all.
jdobbs2001
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10 Meter is dead though, the funny thing is look at all those 10Meter transceivers being sold though, you would think 10M would be packed with all the Galaxy's, Connex,General Lee's selling left and right to ham radio operators.
10 Meters is not dead just because hams aren't buying old CB radios. Radios marketed towards CBers are "channelized" radios. True ham radios have a VFO. I'm not bashing CBers at all as I still have some old CB equipment. I'm just saying that 10 meters is alive and well and you shouldn't base whether or not a band is alive or dead by whether or not a certain radio is selling.
MeddleMan
Member
Exactly and they only cover AM and sometimes SSB. Even if they do cover FM, they don't have CTCSS or DCS.
jdobbs2001
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Those radios are not CBs they are 10 meter mobile transceivers.
Keep telling yourself that. A Galaxy, Connex or General Lee was NEVER meant to be marketed toward the amateur community. Look at the the channel arrangement compared to a standard ham transceiver. You will never see a ham radio that jumps in 10kHz segments ending in 5, i.e., 28.005, 28.015, 28.025, etc. Do you know where you'll see that type of arrangement? I'll give you one guess. Heck, I'll go ahead and tell you that you'll find that type of setup in the CB spectrum.
jdobbs, do you REALLY think that's who's buying those radios?
10 meters is also very changeable due to band conditions and noise levels. Most ham use is on SSB with a few FM repeaters. A true 10 meter rig has a VFO and is not channelized and can do AM, FM, SSB, and CW.
I have a strong hunch you'd describe the Uniden President HR2600 as one of those radios marketed to the CB crowd. Yeah, it was. I think the term "chipswitch" arose from the frequency modifications specifically for that radio and its predecessor, the HR2510.
But let me describe it to you. It has a VFO, covers 28.0 to 29.699 (the entire 10m band), and operates on FM, AM, CW and SSB.
Things are not quite as black and white as you'd apparently like to believe
And as regards the 10m band, even during the summer doldrums there are frequent band openings that permit DXing with the rig's 25w PEP.
But let me describe it to you. It has a VFO, covers 28.0 to 29.699 (the entire 10m band), and operates on FM, AM, CW and SSB.
Things are not quite as black and white as you'd apparently like to believe
And as regards the 10m band, even during the summer doldrums there are frequent band openings that permit DXing with the rig's 25w PEP.
Well let me toss my two cents in here, I personally switched from a Uniden 880 AM only CB radio to a Galaxy 33Hp2. And I have never been happier with the performance. Just last week I made a contact in Baton Rouge, La from central Va on "C" band. Radio dead keys 1watt low, 4 watts medium, and 10 watts high. Swinging to 55 watts.. This radio kicks butt, whether it be a so called 10 meter unit, hot rodded CB, or a export radio.. The hobby of radio is about one's enjoyment of it.. And now i'm enjoying it!!!!
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Dawn
Member
While I guess this should be placed with my posting on rack mount units, I was sent a copy of a service document for the Saturns. It would appear that these 10m radios using the pair of 4008's as programmable dividers (why do they call them adders as they pull the pd pins on the 145106 alternately high or low as preset dividers?) range from 26.065-28.305 for the 5 band or 25.615-28.305 mc for the 10M version? These didn't even have a keyed tone gen to pretend to be CW for the lower end of 10m and the bottom end didn't even correspond with amateur frequencies. There were some amateur oriented versions of earlier units manufactured for the amateur band and marketed though amateur distributor channels during the 80's in 5 band crystal loop osc. using the 8719's starting at 28.5 and reaching up to the FM section covering 29.6mc. The Mongoose brand was the one most of the distributors offered out of the box from the factory in this range using export chassis. No offset capabilities or tone, but did include a half arsed cw input using a keyed tone oscillator and expanded clatifier/RIT.
It doesn't seem that today's 40 channel multibands are set up this way. The microprocessor clones of the HR2600/2500,HTX-10/100 and similar radios are true stepped 10-12M radios with a very limited FM mode that's too narrow to work acceptably with standard 5kc/7.5kc deviation radios used in amateur service due to using the AM filter. I own an Optima. Great unit for AM/SSB but horrid for FM and better to use my commerical Kenwood or Maxtrac in that mode and even better then my Icom 765 or 706. The starting point of 28.5-29.95 as the standard for 40 channel conversions has a long history dating back to the early 80's when the surplus units were hitting the market for conversions for the AM/SSB units. FM conversions of typically 40 ch. AM only 02A conversions targeted the upper regions to include 29.6 .
It doesn't seem that today's 40 channel multibands are set up this way. The microprocessor clones of the HR2600/2500,HTX-10/100 and similar radios are true stepped 10-12M radios with a very limited FM mode that's too narrow to work acceptably with standard 5kc/7.5kc deviation radios used in amateur service due to using the AM filter. I own an Optima. Great unit for AM/SSB but horrid for FM and better to use my commerical Kenwood or Maxtrac in that mode and even better then my Icom 765 or 706. The starting point of 28.5-29.95 as the standard for 40 channel conversions has a long history dating back to the early 80's when the surplus units were hitting the market for conversions for the AM/SSB units. FM conversions of typically 40 ch. AM only 02A conversions targeted the upper regions to include 29.6 .
poikaa
Member
Lurking on the topic and enjoying the talk.... but I have to add this.... They have been known as 'half adders' for a log time and almost the same as dividers. Logic gates they are!
73 poikaa
Dawn
Member
I wish we could have more conversations like this at this level. I have to admit that I'm out of the loop when it comes to CB oriented terminology. My background is commercial communications and amateur radio and I call it what it is. Changing the divide count by selectively combining pd pins in my mind doesn't add up! Sounds more half assed then half addded.
Just look at it this way, the FCC allows these import radios to be brought in and sold and unless they are blind<I doubt it>, they know they are going to be used for CB.
The conversion to FM for 10 meters, use to be the wireman converted those when he was up NORTH many, many years ago , probably converted 500 plus. I had one worked like a champ, left it on all the time. Sold it, should have kept it.
Someone sells converted cb to ten fm on ebay for I believe $35, not a bad price for a channelized radio.
DOCTOR/795
The conversion to FM for 10 meters, use to be the wireman converted those when he was up NORTH many, many years ago , probably converted 500 plus. I had one worked like a champ, left it on all the time. Sold it, should have kept it.
Someone sells converted cb to ten fm on ebay for I believe $35, not a bad price for a channelized radio.
DOCTOR/795
poikaa
Member
BCD, dividers, adders and DDS
There is a modification for CB transceivers to control the PLL and it's channel selection so that the radio will cover continuously from 26 mHz to 28 mHz in 10 kHz increments. One is called the "mod" and the other is by Lescomm. The basic design uses digital dividers of what design I am not sure. I do know most every PLL 'channel control' is BCD design mostly the ICs that can be converted for more 'channels' are of this type.
These are actually divide the reference crystal oscillator (VCO), into channels at 10 kHz increments and keep it stable. The channel switch or 'changer', encodes the inputs in a binary fashion but by design it is kept to 40 channels, at least in the US.
To gain the 'extras' one can tie to programming pins of the PLL IC with a switch or two to change the 'bank' of channels. The use of 'adders' or half adders, full adders will allow better control of the input pins with less chance of floating inputs. 'Floaters' can allow damage to the PLL and may even cause unwanted spurs that may unlock the PLL. 'Adders' are really logic gates with buffers to allow control of the BCD
All this is for frequency control by using a PLL. A better way is to use high speed dividers that can be found in DDS circuitry. Advantages of this are a wider coverage of the frequency spectrum along with finer frequency increments along with the usual 10 kHz, up to mHz tuning.... Controlling the DDS with Arduino or PIC microprocessors will yield keypad entry, memories along with multi-speed tuning.
Some of the newest 'export' rigs are of this design but usually are keep out of the FCC area and only sold as amateur radios.
73 poikaa
There is a modification for CB transceivers to control the PLL and it's channel selection so that the radio will cover continuously from 26 mHz to 28 mHz in 10 kHz increments. One is called the "mod" and the other is by Lescomm. The basic design uses digital dividers of what design I am not sure. I do know most every PLL 'channel control' is BCD design mostly the ICs that can be converted for more 'channels' are of this type.
These are actually divide the reference crystal oscillator (VCO), into channels at 10 kHz increments and keep it stable. The channel switch or 'changer', encodes the inputs in a binary fashion but by design it is kept to 40 channels, at least in the US.
To gain the 'extras' one can tie to programming pins of the PLL IC with a switch or two to change the 'bank' of channels. The use of 'adders' or half adders, full adders will allow better control of the input pins with less chance of floating inputs. 'Floaters' can allow damage to the PLL and may even cause unwanted spurs that may unlock the PLL. 'Adders' are really logic gates with buffers to allow control of the BCD
All this is for frequency control by using a PLL. A better way is to use high speed dividers that can be found in DDS circuitry. Advantages of this are a wider coverage of the frequency spectrum along with finer frequency increments along with the usual 10 kHz, up to mHz tuning.... Controlling the DDS with Arduino or PIC microprocessors will yield keypad entry, memories along with multi-speed tuning.
Some of the newest 'export' rigs are of this design but usually are keep out of the FCC area and only sold as amateur radios.
73 poikaa
poikaa
Member
The MC145106 PLL is used mostly in foreign rigs and 'exports'. Evolved from the PLL O2A, the 145106 was capable of more frequency coverage than the MB8719 even though the MB8719 was derived from the MC145106 and it was used to have different bands of 'channels' that were used in different countries.
73 poikaa
73 poikaa
LoyalServant
Member
I recall there was an MB8734 being a 6 bit variant that was pin compatible with the 8719.
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