#Rfx 75 amp install#
#Rfx 75 amp driver#
#Rfx 75 amp upgrade#

Originally the radio was paired with a KL203 amplifier and I made DX contacts from Africa to Chile. I was rewarded with a very solid performing SSB export radio that I used in my mobile all over the Northwest United States and I took the radio with me when I moved to Hawaii. When I received the radio I did the expanded frequency conversion (which was a little difficult on the older models), added the NPC modification, and turned up the microphone gain via the small potentiometer located inside the microphone. At the time I had purchased one brand new on eBay for $169. It’s hard to believe it’s been seven years since I owned my first amber display Magnum 257. Rather than wasting time re-writing the same info to sound different, I thought I’d focus on writing about what sets this radio apart from the others. That might help to be prepared when installing the first RFX.Magnum 257HP 10 Meter AM/FM/SSB Export Reviewīefore you begin reading this article I will give a little disclaimer: I did use some of the paragraphs from the Omegaforce and Deltaforce articles in this review since these three radios do share some of the same features. In USA these amplifiers are very popular and on the internet you can find many videos and reviews.

#Rfx 75 amp install#

It is necessarily to have good technical knowledge to install RFX types. The RFX85HD is your choice for 10 meter radio repairs and upgrades when all your replacing is the final transistor or no transistors.īoth RFX85 units feature the new fan-ready heatsink design and variable bias controls for better tuning on SSB radio installations. The RFX85HD circuit includes only the final amplifier stage and low pass filter which makes for a much quicker and easier installation.

#Rfx 75 amp driver#

The RFX85 is your choice for 10 meter radio repairs and upgrades that require replacing the radio’s driver and final amplification stages. The RFX85 Circuit includes driver stage, final amplifer stage and low pass filter. There are now 2 RFX85 Choices: the Standard RFX85 and the New RFX85HD High Drive.

However, it is recommended to attach it to the transceiver’s PCB because some transceivers come equipped with antenna warning systems, or other circuits, that are on ancillary boards between the recommended connection point and the antenna connector. * It is possible to attach the RF OUT coax directly to the antenna connector. G) The incoming receive signal is sampled from C14 and connected to the receive strip of the transceiver through the RFX75’s coaxial cable marked RX OUT. This is sent to the S-meter detection circuit in the transceiver through the yellow wire.į) The final RF output signal of the RFX75 is sent back to the radio through the RF OUT coaxial cable where it is connected with the transceiver’s antenna connector *. The RFX75 mounts to the back of most transceivers with little or no modification to the transceiver’s chassis.ī) Once installed, the transmitted RF signal from the output of the transceiver’s driver stage (or pre-driver stage) is sent to the RFX75 via the coaxial cable marked RF IN.Ĭ) The driver signal is then amplified through the RFX75‘s ERF2030 (FET1) and then again through the ERF7530 (FET2).ĭ) The amplified signal from the ERF7530 passes through the RFX75’s efficient low pass filter.Į) A small portion of the signal is sampled through C19 and rectified through D3 and D4. THEORY OF OPERATION OF POWERBAND TYPES, DESCRIPTION OF RFX75:Ī) The RFX75 replaces the transceiver’s final amplifier stage and low pass filter section. Most installations will see 75 – 100 watts PEP output power. The output power of the RFX75 varies depending on the transceiver that it is installed on. The RFX75 features the latest Power MOSFET technology and a built in S-meter detection circuit.

#Rfx 75 amp upgrade#

The RFX75 is a RF final output stage and low pass filter designed as a replacement and/or upgrade for most 10-meter amateur transceivers. RFX75 is an Amplifier, 75 – 100 Watt PEP Output Power, RF Final Output Stage and Low Pass Filter, Designed as a replacement and/or upgrade for most 10 meter amateur transceivers. Under the name POWERBAND, the company PALOMAR in USA sells a line ofĤ types of high power replacement final amplifier sections with high performance low pass filter for 10 meter amateur transceivers.Īfter RFX75 and RFX150 they now introduce the RFX85 and RFX85HD.