My additional goodies on shortwave radio
HI there again and welcome to the second page of my favorite hobby!
Sorry to say that the first page took forever to load so I have done some creative reconstruction and here is the result.
I hope you like it and with that I am back in business again ..
First off there is a ton of information out there about all facets of shortwave radio and this server only
allows so much webspace so if any ideas are thought of please email me to suggest them!!
Now as of April 25 until further notice there will not be a ANARC SWLNET on 7240 khz on Sunday mornings at 10 am.Don't blame me :) According to Dave Kirby the net operator there was some discussion about how the net operates as it was related to amatuer radio and the decision
was made to put it on standby until possibly September or October due to low turnout:( Yep that means now no net to listen to on Sunday mornings.
The good news is the ANRC SWLnet page is still up and you can go thru the archives of past nets and see who has been hearing what.:) You will find a few in there from me as well as a bunch of other dedicated SWL'ers.
Sorry to be the bearer of bad news but that wasn't my decision folks.
However the IRC #swl chatroom is still up and running on any StarChat server.Also look for #ODXA which is run by the Ontario DX Association as well.
Look below for links on the IRC thingy and how you can join us.
Now in 2017, the solar cycle is about at rock bottom and as a result not many dx targets are audible..However South Americans are audible still on 60 meter band and the 31 meter band at night up until around 0500..sometimes later.
The Pacific area is audible at times in early morning and late at night..African stations are hard to hear now but can be heard in late afternoon.
With that out of the way take a look through the page I put together here for some more pics and links to some of the sites I have found over the past few months.
Miniature dx machine.
The Realistic DX380 for an am mode only shortwave radio is not a bad deal for someone just starting out.Also found under a Sangean name of ats808a..
This radio can be found for under 100 dollars at most places. It works well for general shortwave listening and as an added bonus you get TWO bandwidth filters .Definitely not usual to see that feature in a radio of this price class..
If you can find one pick it up and try it out .
Some Quick Spec's for the DX380
Dual Conversion Heterodyne receiver
Complete coverage of shortwave from 1711 khz to 30,000 khz
AM coverage from from 520 khz to 1710 khz
Longwave coverage(European Broadcast band) from150 khz to 519 khz)
FM coverage (stereo from Headphone jack)87.5 to 108 Mhz
Dual IF filters wide and narrow (wide is approx. 6.8 khz) (narrow is approx.3.8 khz)My measurements by ear no fancy tools
Good sensitivity of at least 1 uv or better on shortwave bands.I have no service manual for this radio so an estimate
PLL synthesized receiver.
4 tuning methods including tuning knob
Direct frequency entry tuning via keypad
Frequency readout to 1 khz on digital display
Tunes in 1,5,9,or 10 khz increments(9 and 10 khz increments for am and lw)
Dual clocks and alarm buzzer or radio alarm
External antenna jack(1\8 miniplug)
Clock always displayed on lcd panel along with frequency
All in all a good little performer.Passport to World band Radio rated this at one time as a good buy and recommended for weak reception areas so that is how I found out about it .Specifications were taken from owners manual and I have no actual electrical info for it at this time but it does real well at my nightstand for general listening.
Some people have complained recently about this radio not being very sensitive. Here is a tip and if you are proficient in soldering small parts try this out.Credit goes to Mr.Marco Ciocca for clueing me in on this.
If radio appears to be weak or even dead on the am broadcast band (520-1710 khz) and or the shortwave bands replace the Q3 FET transistor with a MPF102 from Radio Shack.RS part number #276-2062 for 99 cents.
This drastically improved the reception of my DX380 to the point to where I now need to use the local\dx switch to cut back the signal getting in . Please note the original fet was a 2sk291Q which I don't know if that was the MPF102 equivalent or not.But boy it sure made a big difference in my receive.
Thanks to Mr.Ciocca for the help.
portable shortwave dx'ing
Well I can't say enough about this radio here.The Sangean ATS-803a is perhaps overall the best radio Sangean ever made and for a long time the best portable you could find for the under $200 range.
It is now unfortunately discontinued however there are still used models still available out on the market from $100 dollars on down
The RadioShack twin known as the Realistic DX440 is also still found although the differences are that the DX440 hasn't got the recorder din plug jack and also did not come with ac adapter or antenna adapter..
However this is the finest radio I have ever found for the $100 range and the performance can't be beat in this price class of portables.. I have heard stations from all over the globe from the powerhouse BBC to RTM Sarawak
from Malaysia on the tropical bands using just a 21 ft vertical in the trees.
Some quick spec's for the Sangean ATS-803A
PLL synthesized receiver
All AM,LW and SW band coverage from 150 khz to 30,000 khz
FM coverage from 87.5 to 108 MHZ
Am ,Single sideband,and Stereo fm through headphones reception modes
Dual IF filters-(wide approx 6.4) (narrow approx 3.8)
Nine memories--not enough in some people's opinion
Seperate bass and treble controls
BFO for SSB demodulation
Direct Frequency entry via keypad
Four tuning modes including vfo tuning knob
Image rejection better than 50 db
Rf sensitivity better than 1 uv on SW bands.(Approximate guess since RatShack service manual is so screwed up
RF gain control
External antenna connection-RCA jack
Can tune the shortwave bands in 12 subbands with one button.
Variable incremental tuning rate knob. As the faster you turn it the larger the tuning steps
Frequency readout to 1 khz.
Tunes in 1,5,9,or 10 khz increments(9 and 10 khz for MW and LW tuning)
Frequency display light
That is about all I could get from the somewhat screwed up Radio Shack service manual which is the same thing as Sangean model with only slight differences.There are a few modifications that can help this radio out even more and they can be found at some sites I have listed below.
Passport to World band Radio rated this for several years as their choice for a portable radio in the under $300 range and they didn't lie :) Very good value and some can still be found refurbished at Universal radio although they are becoming more rare .Last seen at a price of $140 there awhile back.
Please note Kiwa will be making some aftermarket IF filter kits for the Realistic and Sangean line that use a 450 khz IF.These are becoming available as they start the manufacturing for the various models. The 803A and DX440 should be included in this soon.
Check with them concerning pricing and availability at this time.A link to their website is below
old timers radio
Well I seem to have found a few RadioShack brand radios over the past few years but this one is the oldest one I have found so far that still works.
The Realistic DX160 was made sometime back in the middle to late 70's by GRE Corporation in Japan for RadioShack..Not a digital tuning radio and overall circuit
design is quite a bit out of date but still functionable.Although I wasn't into shortwave radio back then some people have told me this is one of the better
analog tabletop radios that RadioShack had to offer.Based on the performance of their latest offering seen recently it could THE best tabletop type radio they have had.
Some quick Specs on the DX160
150 khz to 30 mhz coverage in 5 bands
Am and ssb modes of operation
Slow and fast AVC
Recieve and standby switch
Automatic noise limiter
Manual RF Gain
BFO for SSB tuning
Sensitivity of maximimum 4uv
Selectivity of 4 khz at -6dB--18khz at-40dB
Image rejection of 45dB
Also to get around the analog dial readout I wired a RadioShack frequency counter up
to the radio so I can tell what frequency I am on.It's not a bad deal if you can find one but don't pay anything over $60 or so for it.
The am broadcast band is it's strongest point with shortwave being a little tricky due to the single bandwidth.Beware though with it's being
such an old design the air variable tuning does tend to drift quite a bit till it is warmed up.It's still not a bad radio overall. I definitely have seen worse.
Some Shortwave Radio Terminology
These are some more common terms you will hear when hearing about shortwave radios in general .I put these here because some of you may not know what they mean or what they are.
GMT or UTC-Greenwich Mean Time or Universal Coordinated Time-What the major broadcasters go by time wise.1500 GMT would be for the people on Eastern Standard Time 10 am in the morning.In summer during Daylight Savings Time that would be 11 am.
AVC or AGC-Automatic gain control-regulates automatically the signal input to your radio's audio section so you don't get a blast of sound if the signal suddenly increases.
BFO-A beat frequency oscillator-What you use to tune into SSB signals with.
IF Filters- intermediate frequency filters-A electronic component in the radio that limits the bandwidth of your radio so you don't hear 30 stations from different frequencies at the same time.Commonly seen as term of 5 khz filter or 2.4 khz filter.
Commonly used bandwidths are 6 khz and 2.4 khz.All shortwave Broadcasters are in bands which are given to them in 5 khz increments.Thus a 10 khz filter is going to let in a lot of audio from an adjacent station 5 khz up from where you are tuned to.
KHZ-a smaller measurement of frequency called kilohertz or in the old days was called kilocycles.You know you have an older radio when the IF filter switchs are labeled as 2 kc or 4 kc.1 khz = 1000 hertz.
MHZ- larger measurement of radio frequencies .this one is however the major measurement as in 3 mhz means the entire band between 3 and 4 mhz.Some radios have the different mhz bands laid out in 1 mhz increments.1 mhz =1000 khz
Meter-European way of measuring the shortwave bands such as 5975 khz would be in the 49 meter band.The term is used to describe the actual electrical length of a transmitted signal in meters.
SSB-SingleSideband-A mode of transmitting with reduced carrier or no carrier.Hams and utility stations use this quite often as it saves on bandwidth and can be heard somewhat farther than normal am mode.There are 2 kinds of SSB -Upper sideband USB - and Lower sideband LSB.
SWBC -Shortwave broadcast- used in terms of SWBC bands or International shortwave broadcasters as in VOA.
CW- continous wave-What is called Morse code.Used by hams and utility stations such as ships at sea.
Mode-type of transmission-can be am,ssb,cw,fax,rtty or fm.
RTTY-Radio TeleType-A digital form of transmitting by hams and those pesky utility stations
Utility stations-No these are NOT the local power or water companies :) Rather they are not SWBC's such as the Voice of America but private or governmental stations and services that transmit on the shortwave bands.They can be found just about anywhere and some even have the guts and or ignorance to transmit in legal SWBC bands on top of regular stations such as Radio Jordan.
They are more commonly referred to as utes
These are just a few of the terms used in day to day shortwave radio stuff.For a more complete SW dictionary I suggest the Passport to World Band Radio book or the PWBR as we call it.
even more shortwave related links to be found
- Ulis Flemings site joe bob say check him out
- DX'ING HOMEPAGE
- more shortwave info can be found here
- FINEWARE WWW PAGE
- Computer programs for radios and some other goodies as well
- kiwa electronics
- accessories for shortwave radios and some nifty modifications
- HFSkeds website
- A great place to find updated broadcast schedules compatible with OpenOffice or MS Office.
- He liked my kitty and I liked his links so we are even
WANT TO KNOW HOW TO GET YOUR OWN SHORTWAVE RADIO NOW? TRUCK ON OVER TO PAGE 3 OF MY SHORTWAVE SITE USING THE TONKA TRUCK BELOW .