A Look Inside of the Repurposed CB Radio, 1980 Ham International Jumbo Part-1

Подписаться 2,5 тыс.

Просмотров 1,6 тыс.

50% 1

In this video I go through how this heavily modified CB radio works and take a look under the hood. This is the first part of a series of videos.
Part-1 covers HF and 6 meter RF front end, mixer, first IF and DDS local oscillator.
Please leave any comments, suggestions or ideas as I would be great to hear from you.
Please Note: I am currently updating the block diagram I made for the video and I will leave a link in a day or so. (Watch this space)
Links
Voltage Controlled Attenuator
BAP64Q made by NXP
Quad Pin Diode device
We used the circuit from the example from the datasheet worked great on HF but needed some linearity correction across the HF band however we did this with the microcontroller. www.mouser.co.uk/datasheet/2/...
DDS Signal Generator converted to a local oscilator / VFO using AD9910 device.
Note: We are overclocking this device with the MCU at frequencies above 400MHz
GRA AFCH
gra-afch.com/catalog/rf-units...
Not sure if is the same model we are using as it may be a later rev.
Analog Devices AD9910 Information
www.analog.com/en/products/ad...
RF Mixer
AD831 from Analog Devices
www.analog.com/en/products/ad...
RF Switching IC
Analog Devices HMC849
www.analog.com/en/products/hm...

Наука

Опубликовано:

20 июл 2024

Ссылка:

Скачать:

Готовим ссылку...

Добавить в:

Мой плейлист

Посмотреть позже

Комментарии : 12

@seanregan730 Год назад

Thanks John, Excellent stuff. Jack Told you its not the guts of an icom stripped out and fitted into a Junbo case LOL. Fantastic project really enjoyed this one. best regards Sean G7FIK

@M0XFXUK Год назад

Hi Sean, Thank you for the comment, LOL, yep I had a lot of people simply not believing what they were seeing. Big learning curve for me but I fun too. best regards John M0XFX

@raydavidsonm0ray.777 Год назад

Hi Jonny, The oll Girls coming on a real treat. For all those who don't believe what is really going here, I've known John M0XFX for at least 20 yrs, and I know that he don't cheat, at least when it comes to Radio Repair & Design. The Design and build of this radio is from his own pocket and head, , , , not out of another radio & stuffed into the old CB Case, Which I personally owned prior to this set of modifications shown here. Well Done So Far John. Kind Regards to All. Ray, M0RAY, Kent, UK.

@M0XFXUK Год назад

Thank Ray, hope you are well mate

@darynsax Год назад

WOW how the hell did you figure all that out it's amazing and way over my head. Really impressed here thanks for sharing

@M0XFXUK Год назад

Hi Daryn, Thank you for your comment Best regards

@Randrew Год назад

Thank you for walk-through, John. This is certainly a very interesting project you've undertaken! It reminds me that we're very fortunate these days that we can buy relatively inexpensive, function-level boards / modules. Frees you up to concentrate on the higher level, overall functioning of your project. And that's what I think folks are finding so intriguing with this project... that you're really packing in the features!

@M0XFXUK Год назад

Thank you for your comment and I’m glad you find it interesting. I totally agree that we are fortunate these days with the availability of cheap RF modules. The micro computer and coding does make the radio perform really well and with the added benefit of being to add many functions by writing code. My next project I thinking of a complete SDR transceiver not sure whether to go with a mixer or direct conversion. I have been playing with the (Hack RF One) module which I’m finding very interesting. Best Regards John