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Old 14th October 2012, 09:11 PM   #21
DF96 is offline DF96  England
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Quote:
Originally Posted by bear
That is only one aspect of the way conversations or contacts happen.
Of course. It is the aspect which puzzles me, though. I remember once hearing someone proudly telling his contact (I think on 2m) that he had 'made up a cable' (i.e. soldered connectors on the end). I was tempted to butt in and tell them that I had made the receiver, converter, transmitter, PSU and all the cables too. I decided that would sound too much like bragging so I kept silent.
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Old 15th October 2012, 12:53 AM   #22
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Default no code not necessarily just an applicance operator

i am a no code tech and designed and built my own antennas (i mainly operated on all the amateur satellites (at least until they all died)) rotor controller, amplifier and power amp. I also developed my own software to predict satellite passes, common viewing geometry and log my constacts. I still don't know the morse code, i appreciate where it is useful, missed a few contacts, but was never successful in learning it (tried all the various classes....). my elmer was really good he could carry on a conversation with me and listen to code in the background but i just did not have whatever was required to deal with morse code.

I made several friends in europe and would have long conversations with them. One person i met told me 'his government would not let him leave his city', we used to send xmas cards to each other.

just my 2 cents.
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Old 15th October 2012, 02:37 PM   #23
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I remember once hearing someone proudly telling his contact (I think on 2m) that he had 'made up a cable' (i.e. soldered connectors on the end)....tell them that I had made the receiver
In the RF world it's just like the audio world. Have we not seen threads here where someone is proud of the new interconnects or power cord that they just "designed"? We all had to start somewhere. My lifelong audio adventure began when I stripped a guitar cord and twisted its wires to the tone arm wires in an old Magnavox HiFi. I had "built" my first guitar amp at age 8 or so.

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i am a no code tech and designed and built my own antennas
I am a no code extra. I used to make transceivers for UHF, EME, and other speciallized modes. I had designed and built my own HF SSB HF rig from parts I acquired when Pearce Simpson folded.

For those who don't know, they made CB sets. Their depot in Miami was mostly a distribution center for Japanese made radios with repair capability. For some reason there was a small room with some nice equipment and a good stash of parts that didn't fit their radios. High quality crystal filters and VHF transistors....SWEEP TUBES and 600 volt dynamotors (I wonder what they were making?).

I had a home made radio feeding a home made antenna on HF, An ATV setup on 432 and 902, a 902 FM repeater, and some other UHF experiments including 902 EME through a 12 foot TV dish.

After having the 12 foot dish in the yard for 15 years the city code enforcement nazis determined that it had to be removed. I attempted to fight this, which escalated to me being removed from the mayor's office by the police. My lawyer said it was a hopeless case. They now demanded that I remove ALL antennas from the property, even the TV antenna. All ham radio activity ceased in 1995.

This city has had a long list of corrupt officials including the first mayor who went to prision for defrauding the city, got out and ran for election again and almost won. The mayor I fought with was disbarred for ethics and is no longer around. Most of his henchmen are gone, and the code nazis are busy with all the empty houses. So about 4 years ago I put up a wire antenna that I got at a hamfest, got a cheap Yeasu and plugged it in. Didn't even solder my own coax! It will work Europe on 20M using JT65 and 5 watts.

I upgraded my license to extra because there was a group of ex Motorolans that used an extra only frequency. I discovered that "progress" in the form of a set of 250 KV transmission lines have moved in right across the street. These have made it impossible to use any frequency below 7 MHZ and raise the noise level of the entire HF band. My 902 MHZ experiments have always been limited by IMD products coming from a massive cell site about 1 mile away. Last weekend I was out of town and returned to find a brand new cell tower right across the street. It is not active yet, but It can't be a good thing.

Quote:
An interesting point are regenerative receiver, mainly made of vacuum tubes. In the digital era, with big DSP´s and too complex receiver (triple or more conversions), and lots of SMPS sputtering noise in all HF bands, a very simple regen can do the job better than them. A simple 12AU7 can perform several times better than a Yaesu, Kenwood or Icom sophisticated receiver. I can sure you it's true.
A simple regen made with tubes, mosfets, or even kryptonite has very limited selectivity. Granted they can be made sensitive enough in to work great in a low noise environment. I guarantee you, that it will not work as good as any radio with decent filtering in a dense RF environment like this. The "S" meter on the Yeasu sits just above +9 on 40 meters and +5 on 10. On a humid summer night it is pegged on 80M. My 902 antenna sees -15 dbm per carrier with 50+ carriers from 870 MHz to 896 MHz. The 902 weak signal frequency is 902.1 MHz. I hope the new tower is for LTE at 700 MHz or 3G at 1900.

You need extreme linearity and low noise to acheive the dynamic range needed to pull a weak signal out of that mess. The low end Yeasu will NOT do it, so I am slowly working on something that will. About the only parts that are linear enough are those designed for cellular and public safety base stations. Look at the circuits in a $10,000 Yeasu or Icom contesting radio. They use triple conversion for main selectivity and 24 bit convertors feeding an IF DSP for slicing one weak CW signal from between two strong ones a few Hz away. Tune through the CW band with a spectrum analyzer equipped radio on a contest day to see why this is needed.
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Old 15th October 2012, 05:43 PM   #24
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dear Mr.tubelab,

In a nutshell - time to move!

surely your property has appreciated in value since you bought it?
find one of those nifty Florida foreclosures on the cheap.

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Old 15th October 2012, 07:30 PM   #25
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Quote:
Originally Posted by tubelab.com View Post
The "S" meter on the Yeasu sits just above +9 on 40 meters and +5 on 10. On a humid summer night it is pegged on 80M. My 902 antenna sees -15 dbm per carrier with 50+ carriers from 870 MHz to 896 MHz. The 902 weak signal frequency is 902.1 MHz. I hope the new tower is for LTE at 700 MHz or 3G at 1900.
Ja, ja ja... And when the new switchers (I know them from LT) operating between 1 and 10MHz, the HF bands will be briefly absolutely unusable, as soon as they enter in the massive market of electronic thrash.
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Old 16th October 2012, 12:47 AM   #26
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In a nutshell - time to move!.....surely your property has appreciated in value since you bought it?
I have lived in the same house for almost 35 years. I bought it for $40K in 1977. The same house down the block sold for $327K at the height of the insanity. Now they are going for about $140K.

Quote:
find one of those nifty Florida foreclosures
I have worked in the Motorola plant for the past 40 years. I started as a factory tech, and have been a design engineer for the last 30 years. Mot paid for me to go to school and collect a couple of engineering degrees.

Things have changed a lot in 40 years and us old timers are an endangered species. Since the plant was built, NOBODY has made it to 45 years of service. I will hold on to my job as long as they keep me, then it is.....time to move.

I have never lived anywhere but here for 60 years. I have already got a house in small town West Virginia. I expect that I will be there sometime in the next few years.

Quote:
And when the new switchers (I know them from LT) operating between 1 and 10MHz,
A modern LCD TV is a pretty good jamming device. The QRM here is above the level of the TV radiated stuff, there is no change in reception with the TV on or off. My Yeasu is sitting right on top of a cheap Jetstream variable SMPS without ill effects here. Other users of this power supply report QRM.

I designed iDEN cell phones for a few years about 12 years ago. iDEN is worst case for phones since it uses 25 KHz wide RF channels. A switcher or processor clock harmonic can take out a complete channel. A similar spur will only cause a BER (bit error rate) degradation on an LTE or CDMA channel. We devised clock shift and dithering methods that are now commonplace in switchers and fast digital systems.

I now work in public safety radio design where 12.5 KHz channels are the norm. We designed and built a mobile radio that ran full duplex narrow band data (transmits and receives at the same time on different frequencies in the same band) and made 100 watts of peak power. It used a 200 watt switcher operating at 1 MHz to power the transmitter. The receiver made -121 dbm sensitivity with 80 db IM rejection while the transmitter was running 13 MHz away. A DSP and a host processor are also operating inside the radio. We know how to deal with switchers and DSP's that are within our domain. All equipment sold in the USA are supposed to meet FCC standards for EMI emission. We all know that that isn't always the case.
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Old 16th October 2012, 02:35 AM   #27
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HT44/SX117/HT45 here -- and an expired license!
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Old 16th October 2012, 03:17 AM   #28
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If it is not too long, Jack, you can still renew... ur missing a whole lot of fun on 75m AM! Or just go to a local club or hamfest and take the test again...
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Old 16th October 2012, 03:43 PM   #29
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Or just go to a local club or hamfest and take the test again...
The test has become a rather simple inconvinience. It is multiple guess. All the questions in the question pool are posted on the internet....with answers. We used to call this cheating in school.

There are web sites where you can take practice tests for free. Each test is randomized with diferent questions. Just spend an afternoon taking them over and over again until you consistently score in the 80% range, then go for the real test before the memory fades.....that's a few hours in my case!
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Old 16th October 2012, 04:51 PM   #30
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I was in high school when i got my general -- i had to take the code portion 3 times before i passed it -- and then i fell in love with 40m CW.

all the equipment i have now, save for the Eico 753, is stuff i would have loved to own.

i also purchased a HT32/SX101A/HT33 from a guy in Connecticut -- pick up only -- and you had to purchase the entire station! one of the docs who practiced medicine with my uncle had this same station in independence Ohio.
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