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 Post subject: Ozark patrol
PostPosted: Dec Tue 22, 2015 4:56 pm 
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Has anyone built the ozark patrol sw.regenerative radio kit ? It looks pretty neat I am thinking of treating myself to one after Christmas. Let me know if anyone has.


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 Post subject: Re: Ozark patrol
PostPosted: Nov Mon 23, 2020 8:06 pm 
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I am trying to build one but i have problems with stupid toroid...
not with winding than with type ..
any experience with this one let say good regen ?

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 Post subject: Re: Ozark patrol
PostPosted: Nov Tue 24, 2020 3:39 am 
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I have had one for a few years now and have used the audio amplifier and chassis to build numerous different front ends.

By using a ferrite rod instead of a toroid for the tuning inductor it is possible to receive most commercial North Anerican stations without the need for an external antenna. I use mine most evenings to listen to SSB on the 80 meter and 40 meter amateur bands up and down the East coast of the U.S. all without the need for an external antenna.

Its sensitivity, selectivity and noise immunity exceeds that of my best hand held commercial shortwave receivers in the same environment when using their built in whip aerials. Very nice circuit board which is also used as the front panel.


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 Post subject: Re: Ozark patrol
PostPosted: Nov Tue 24, 2020 1:11 pm 
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Ok
So i need to use ordinary feritte rod and wind this 20 turns of 0.5 mm wire + 1 turn for emitter coil
is that right?

Another thing when i use real HF transistor like C3355 or S9018 then circuit start to
oscillate like hell....
so my question is how much transistor is critical and is it better to use
high gain general purpose transittor like BC550 or meybe metal case like
2N1938...

EDIT:
Oups i have few of this ..it is 2N1893,,,,and yes i used it in the past when i build FM transmitters!

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 Post subject: Re: Ozark patrol
PostPosted: Nov Tue 24, 2020 5:36 pm 
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Quote:
Its sensitivity, selectivity and noise immunity exceeds that of my best hand held commercial shortwave receivers


This is probably true with :
Original transistor 2N3019 which i don't have .
Whithout connected antenna circuit tend to go into selfoscillation on lower voltage 6V i tried
using 4 AA battery.
I will completelly rebuild it

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 Post subject: Re: Ozark patrol
PostPosted: Nov Wed 25, 2020 6:12 am 
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Location: near ST Louis Mo 62002
A 2n2222a would work for except for the audio out ,but they are cheep https://www.digikey.com/en/products/det ... 7a1b4526c2

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 Post subject: Re: Ozark patrol
PostPosted: Nov Wed 25, 2020 9:13 am 
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hmm 2222 is not a option for audio at all like any real
high frequency transistor and because this one is a reflex
1 transistor also must gain audio signal to ,so general purpose must be used.

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 Post subject: Re: Ozark patrol
PostPosted: Nov Wed 25, 2020 3:42 pm 
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Location: West Point, PA 19486
I built one. It works great, but the audio through the speaker was dismal. I could hardly hear it. It sounds good through headphones.

I added a $1 audio amp kit and replaced the gimmick with a real capacitor. Works very well now! The amp goes between the leads going to the speaker and the speaker. Just set the pot on the audio amp and you never have to touch it again. The audio is still controlled through the knob on the front panel.


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 Post subject: Re: Ozark patrol
PostPosted: Nov Wed 25, 2020 6:10 pm 
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Location: near ST Louis Mo 62002
The 2N2222A won't work for the last audio out is because of power limitations , only .

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 Post subject: Re: Ozark patrol
PostPosted: Nov Thu 26, 2020 2:34 am 
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Lovely picture and lovely work, Sky. Lead dress is so clean.

That's about the prettiest pine board I've seen.


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 Post subject: Re: Ozark patrol
PostPosted: Nov Thu 26, 2020 8:33 pm 
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Great version...
Ok
In first place i try to build clone not using original kit
So my question is what would be good replacement for 3019 transistor

EDIT:
I see when i enlarge a image that your model use plastic transistors ..which ?
and is there a way that circuit work on 6 V not on 9 so using 4 AA battery ?

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 Post subject: Re: Ozark patrol
PostPosted: Nov Fri 27, 2020 11:08 am 
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SkyKing
do you say what plastic type you use in your kit?

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 Post subject: Re: Ozark patrol
PostPosted: Nov Fri 27, 2020 8:35 pm 
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aurel wrote:
hmm 2222 is not a option for audio at all like any real
high frequency transistor and because this one is a reflex
1 transistor also must gain audio signal to ,so general purpose must be used.

aurel wrote:
SkyKing
do you say what plastic type you use in your kit?

aurel wrote:
Great version...
Ok
In first place i try to build clone not using original kit
So my question is what would be good replacement for 3019 transistor

EDIT:
I see when i enlarge a image that your model use plastic transistors ..which ?
and is there a way that circuit work on 6 V not on 9 so using 4 AA battery ?

Aurel: When I first met you on the Radioboard many years ago I hoped to make your life simpler by trying to explain to you that almost any general purpose transistor will work with radio circuits on these threads even above 100 MHz.

It continues to appear that you did not take my advice and 1/2 of your posts seem to be dedicated to inquiring what transistor may be used as a substitute.

All silicon general purpose bipolar transistors have similar Base-Emitter voltage drops and may be biased similarly. Differences such as input capacitance, Beta and fT are rarely factors that prevent a properly biased circuit from functioning properly. In some circuits power dissipation capabilities must be considered, but in general there are hundreds of transistors that may be used successfully with almost any radio circuit on these threads.

The transistors that I use exclusively are NPN 2N2222, 2N3904 and 2N4401. For PNP 2N2907, 2N3906 and 2N4403. They all may be interchanged within their NPN or PNP type with no difference in circuit performance.

The link below is to a company selling transistors on Amazon. There are many others. The per transistor price is very small in any currency.

https://www.amazon.ca/Values-Silicon-Tr ... NrPXRydWU=

I hope that finally understanding this concept will make your life easier.


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 Post subject: Re: Ozark patrol
PostPosted: Nov Sat 28, 2020 6:30 pm 
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Quote:
I hope that finally understanding this concept will make your life easier

really ...
you have wrong concept in your head ....let say "me myself & I" everyone else is stupid or limited
right?
and please stop patronizing about everything :D

In your "religion" all NPN transistors are same or similar
beep WRONG!
Yes ...i agree with you that "we" may use any general purpose transistors in audio circuits and in many
AM---LW-MW-SW up to 30..40...60Mhz

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 Post subject: Re: Ozark patrol
PostPosted: Nov Sat 28, 2020 6:34 pm 
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Ok back to topic
i tried complete configuration with BFJ92 on 6V and circuit work similar to some presented on youTube.

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 Post subject: Re: Ozark patrol
PostPosted: Nov Sun 29, 2020 4:55 pm 
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Location: West Point, PA 19486
aurel wrote:
SkyKing
do you say what plastic type you use in your kit?


I used 2SC458 that I got from ebay.

I did this because the volume through the speaker was too low with the 2N3019.
It made no difference whatsoever, so 2SC458 or equivalent is a good substitute.

These were used in a walkie-talkie, so I knew they were good to at least 30mHz. (actually, much higher)

Because of the way the kit is soldered, you can replace a transistor in about one minute or less. This made it easy to compare, since shortwave can fade in and out and I was doing it by ear.


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 Post subject: Re: Ozark patrol
PostPosted: Nov Mon 30, 2020 8:59 am 
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Quote:
so 2SC458 or equivalent is a good substitute.


Thank you SkyKing ...
I build it in a soldering pcb pieces glued on metal plate so it is also
easy to change. :)

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 Post subject: Re: Ozark patrol
PostPosted: Nov Mon 30, 2020 8:38 pm 
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according to info

The best and correct substitute for 2SC458 is BC549 (30V/30V/5V/100mA), a very low noise device

that one i have so i can try !

and here is more :
Quote:
Replacement and equivalent transistor for the 2SC458
You can replace the 2SC458 with the 2N3708, 2SC1815, 2SC2458, 2SC2960, 2SC3114, 2SC3198, 2SC3199, 2SC3330, 2SC3331, 2SC3382, 2SC3383, 2SC3916, 2SC3917, 2SC3918, 2SC3919, 2SC3920, 2SC3921, 2SC3922, 2SC3923, 2SC536, 2SC945, 2SD1207, 2SD1347, 2SD1835, 2SD789, BC182LB, C1815, C945, H945, KSC1815, KSC945C, KTC3198 or KTC3199

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