Please note that there are several different models on the market, and you will need to choose which mod suits the model you have.
After modification, the VX-7r has a VERY wide TX range, and therefore it is up to you to display common sense to ensure that you don't transmit on bands for which you are not authorized!
Also note that the modifications will take the radio well outside of it's specification, and may put the finals under significant stress, especially if transmitting into an untuned antenna (eg. the stock rubber-duck is no use at 150+ or 455+MHz).
You undertake the following mods at YOUR OWN RISK!
That said, I have done the mod to my own VX7r with no problems at all
Picture courtesy of XU7ADQ Flickr
Picture courtesy of XU7ADQ on Flickr
VX-7r (USA Version)
Author: Rick Jones -
- Remove the battery pack.
- Remove the sticker/cover seal for the pressure sensing unit (SU-1), in the battery compartment. This is the black strip above cellular warning label and is where the SU-1 option goes (see XU7ADQ's pictures above).
- Locate row of eight jumpers. They are numbered.
- For Mars/Cap, remove solder jumper 5.
- For Freeband, remove solder jumper 4 and 5.
- Reset microprocessor. (Press and hold in the 4, band, and v/m keys while turning the radio on. (alternative reset method is shown below)
- ENJOY
Freeband: 40-224.995Mhz and 300-579.995Mhz
Mars/Cap: 50Mhz-54Mhz, 140Mhz-174Mhz, 222Mhz-225Mhz, and 420Mhz-470Mhz.
EUROPEAN/EXPORT (B1 VERSION)
This is to inform you about the European version VX-7R modification. I own the B1 European/Export version (Label outside the box indicates DST:EXP / TYP:B1). Prior to any modifications the transceiver’s jumpers was soldered on positions 2,4,5,7 (factory setting) and the unit was capable of working on the following frequencies ONLY!- 50-52MHz (RX ONLY, NO TX Possible!)
- 144-146MHz (RX/TX)
- 430-440MHz (RX/TX)
Reception was NOT possible anywhere outside these limits!
In order to modify it you should:
- Unsolder every jumper
- Reset the transceiver by holding down MON/F + HM/RV + Internet Key and power up the transceiver. This will display the Vertex Standard logo instead of Yaesu. Bear in mind that resetting the transceiver by using the method for the USA version (holding down 4 + BAND + V/M and powering up the transceiver) WON’T work! It will just enter a curious set up:
- RX on all bands
- No WX Channels
- Menu Item Misc Setup 20: BEAT SQL (Instead of WX Alert)
- Menu Item Special Memory 6: JR (Instead of Marine)
- Menu Item Misc Setup 17: Japanese (Instead of English)
- Transmission on 40-224.995Mhz and 300-579.995Mhz
After the aforementioned modification you will have continues RX coverage from 504KHz up to 999MHz (including analogue cellular frequencies - NO GAPS!)
Many thanks to Simeon Leriou, SV2GNM for his patience and his will.
73’s to all.
