| Created: 07 Nov 2015 Drake L-7 | |
| Subject: Installing additional cooling fans for the Drake L7 PS | |
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Operating my L7 on the Continental 230 V / 50 Hz Mains caused the transformer to run rather hot and after a while to even give off 50 Hz humming noises. The addition of 2 cooling fans eliminated that ... Click here to view the article. | |
| Created: 06 Nov 2015 Icom IC-2800 | |
| Subject: Repair an Icom IC-2800H control head and replace the CFL with LED backlighting | |
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I have successfully repaired the Icom IC-2800H control heads removed the CFL lamp and converted them to LED back-lighting The CFL lamp generates a lot of heat and causes the units to fail. Down... Click here to view the article. | |
| Created: 03 Sep 2015 Icom IC-706MKIIG | |
| Subject: No RX /TX on VHF and UHF on IC-706MK2G | |
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If your radio does not receive and transmit on VHF and UHF check out the IC351 on the Main Unit. This IC will switch the high pass filters on the HPF Board. If this IC is faulty you have supply voltag... Click here to view the article. | |
| Created: 13 Sep 2015 Icom IC-756PRO3 | |
| Subject: Display not working,no rx/tx etc. | |
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After a thunderstorm this radio stopped working and it was sent for repair. It was sent back as not possible to get in shape again but some CVI -input components and master cpu was replaced. T... Click here to view the article. | |
| Created: 23 Sep 2015 Icom IC-9100 | |
| Subject: 147MHz expansion for UK NOV on IC-9100 | |
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In the UK, full licence holders can currently apply for an NOV (notice of variation) to operate temporarily between 146 and 147 MHz. The RSGB and OFCOM have stated they prefer this ... Click here to view the article. | |
| Created: 17 Oct 2015 Icom IC-910 | |
| Subject: Low RF Power Output on the Icom IC-910H transceiver | |
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Symptom: The radio may not transmit at full power, example up to 100 watts on FM. Increasing the RF power output control has no effect after some point around midway, and RF output may reach only 50... Click here to view the article. | |
| Created: 31 Oct 2015 Icom MISC | |
| Subject: Interfacing the ICOM MA-500TR Class B AIS transponder to other navigation equipment | |
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By Pedro M.J. WYNS, BSc&T. The Icom MA-500TR is a very promising AIS device when reading the promotional leaflets. Installing and integrating it with other brands of equipment can be a seri... Click here to view the article. | |
| Created: 09 Dec 2015 Icom IC-707 | |
| Subject: IC-707 lcd backlight replacement | |
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Could not find any info on procedure to replace bulbs so wanted to post some information here in case it may help someone else. The only knob needing to be removed is the tuning knob in order to acce... Click here to view the article. | |
| Created: 10 Dec 2015 Icom IC-V80 | |
| Subject: RX and TX expantion with keyboard on IC-V80E | |
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Power OFF Push and hold MONI + UP ARROW + VFO when power ON. You have now RX and TX from 136 - 174 MHZ. An all reset will clear this RX -TX expantion. Click here to view the article. | |
| Created: 20 Dec 2015 Icom IC-7100 | |
| Subject: HF SSB OUTPUT FIX | |
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Many people have complained that the IC-7100s SSB output on HF is abysmally low. I decided to investigate further. Note: I accept NO RESPONSIBILITY for the outcome, should you decide to go ahe... Click here to view the article. | |
| Created: 09 Sep 2015 Kenwood TS-930 | |
| Subject: Repair guide for TS-930S | |
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This is a repair guide with many good information. Download the complete article here: A-COMPENDIUM-OF-INFORMATION-ON-REPAIRING-YOUR-OWN-KENWOOD-TS-930S.pdf Click here to view the article. | |
| Created: 09 Sep 2015 Kenwood TS-930 | |
| Subject: Repair guide to modernizing the power supply in Kenwood TS-930 | |
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This is the guide to upgrade the power supply in Kenwood TS-930S. Download the complete article in PDF here: A-GUIDE-TO-MODERNIZING-THE-POWER-SUPPLY-IN-YOUR-KENWOOD-TS.pdf Click here to view the article. | |
| Created: 22 Oct 2015 Kenwood TR-9000 | |
| Subject: Modification of the power of a TR9000 Europe models | |
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On the European TR9000, the button low / high does not exit. In the place there is the button TONE wich activates the 1750 Hz for the repeaters. I thus studied the possibility of passing in small p... Click here to view the article. | |
| Created: 27 Oct 2015 Kenwood MC-59 | |
| Subject: Kenwood MC-59 Microphone keypad fixing | |
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Please find attached a very intersting fix for the keypad of MC-59 microphone. Many OMs complain about the keypad out of work over years if the transciever is used in a car. This electronic modifica... Click here to view the article. | |
| Created: 11 Nov 2015 Kenwood TR-751 | |
| Subject: Power/Squelch and RIT/RF Modification | |
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The following instructions will assist any TR-751A owner through the steps needed to replace/modify the existing Power/Squelch and RIT/RF poteniometers. KF7LPU-Kenwood-TR-751A-Power-Squelch-and-RIT-R... Click here to view the article. | |
| Created: 30 Nov 2015 Kenwood TS-570 | |
| Subject: how to recover power meter 60w back to 100w after power increas mod on TS-570 | |
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if increase power mode is done the power indicator on displays show 60w only, even if you get back to 100w power output.this is how you get back to correct reading on display. putt the radio on 14.... Click here to view the article. | |
| Created: 14 Dec 2015 Kenwood AT-250 | |
| Subject: Connection Cable TS-140 to AT-250 | |
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cable-TS-140-to-AT-250.pdf Connection Cable for TS-140 ACC3 plug to AT-250 ACC plug. This cable connection is untraceable in the internet and is an information from Kenwood. Click here to view the article. | |
| Created: 09 Jan 2016 Kenwood TS-590 | |
| Subject: TS-590S ALC circuit modification procedure | |
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This is the original ALC-mod for Kenwood TS-590S. Download the complete PDF file in 7 pages as PDF from ts590-alc-fix.pdf. Click here to view the article. | |
| Created: 16 Sep 2015 MFJ MFJ-4125 | |
| Subject: Fan noise reduction - thermal switch on MFJ-4125P | |
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*** ALWAYS UPLUG POWER SUPPLY BEFORE PERFORMING WORK ON IT. ALLOW SUFFICIENT TIME FOR CAPACITORS TO DISCHARGE. PERFORM AT YOUR OWN RISK *** There are already a few modifications for reduc... Click here to view the article. | |
| Created: 06 Sep 2015 Other MISC | |
| Subject: Power op problem for Codan 8525B/8528/9313/9480 series | |
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This Service Bulletin refers to 8525B/8528/9313/9480 series transceivers that power up of their own accord. 8525B/8528/9313/9480 series transceivers invoiced from August 1995 are fitted with this modi... Click here to view the article. | |
| Created: 08 Sep 2015 Other MISC | |
| Subject: Intermittent Power Connection on Baofeng UV-82 | |
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Baofeng-UV-82.doc.pdf The attached article shows a fix for intermittent power on the Baofeng UV-82 whcih was caused by a loose screw on one of the battery spring contacts. Click here to view the article. | |
| Created: 16 Sep 2015 Other MISC | |
| Subject: Solved the RFI feedback on Tytera MD-380 | |
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PA1VW solved the RFI feedback with the speaker/mike and the MD380 on portable antenna. Right under(see picture) we put a capacitor of 33 pF and the problem was gone. Click here to view the article. | |
| Created: 19 Sep 2015 Other MISC | |
| Subject: Zastone MP-300 Adjustments | |
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RF power and audio deviation mod for Zastone Mp-300 Click here to view the article. | |
| Created: 22 Oct 2015 Other MISC | |
| Subject: Use Hy-Gain AR-40 Rotor with Standard 8 wire Control Box | |
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You can convert the AR-40 5 wire rotor to use the standard 8 wire rotor box. All that isnecessary is rewiring the inside of the AR-40 rotor. Procedure to convert an AR-40: Remove the 4 screws on t... Click here to view the article. | |
| Created: 26 Oct 2015 Other MISC | |
| Subject: Extended frequency modification for Elad FDM DUO SDR transceiver | |
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Hello, working on the TX board I removed (for my mistake) a wrong component. So I discovered that by removing the R94 resistor the TX section is fully open on the whole spectrum from 9 KHz to 54 MHz. Click here to view the article. | |
| Created: 14 Nov 2015 Other MISC | |
| Subject: Five mods for Lampkin Micrometer Frequency Meter | |
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Here are five modifications to the Lampkin Laboratories Micrometer Frequency Meter. This is for the Type 105-B, but should work for the Type 103-B and others in the Type 100 series. 1. Freque... Click here to view the article. | |
| Created: 20 Nov 2015 Other MISC | |
| Subject: Understanding the CDE/Hygain CDE-45/HAM IV rotators design | |
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Understanding-the-CDE.pdf An overview of the CDE/Hygain rotators especially the CD-45 II and the Ham IV II types. This covers the wiring gauge between the Control Box and the Rotator and why you need... Click here to view the article. | |
| Created: 12 Jan 2016 Other MISC | |
| Subject: Modifications PAxHPT to the 125Mc/s frequency counter Racal 801M | |
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Practical: my 801M counts well till 146Mc/s A second decimal point is added to get the kilocycles between points. This makes reading out much easier. It is an old idea from the magazine CQPA The neo... Click here to view the article. | |
| Created: 07 Nov 2015 Uniden BC-800XLT | |
| Subject: Upgrades and repairs to Uniden/Bearcat BC800XLT | |
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This PDF contains some repair and upgrade information for the Bearcat 800XLT scann Ther. It shows which parts to replace and which typically fail. bc800xlt-repair-info.pdf Click here to view the article. | |
| Created: 08 Dec 2015 Uniden BC-980XLT | |
| Subject: tuning points and adjustments Bearcat 980SSB | |
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From the factory my 980 was only set at 3 watts on AM. I turned it down to 1 1/2 watt but if you want to turn yours up its a very simple procedure although you won't get much more than 5 watts ou... Click here to view the article. | |
| Created: 16 Sep 2015 Yaesu FTM-100 | |
| Subject: Yaesu FTM-100 MARS/CAP mod (frequency expansion) | |
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In order to expand the frequency coverage (RX and TX) you need to remove R1850 on the european model.R1850 is located near the paper covered UPDATE switch. It is the second resistor righ... Click here to view the article. | |
| Created: 21 Sep 2015 Yaesu FTM-400 | |
| Subject: Cross-Band Repeat - Important Instructions for FTM-400DR | |
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Attached is a complete guide for enabling and disabling the Yaesu FTM-400DM Cross-Band repeat function. In .docx and .pdf This is a complete and researched / tested method report. Yaesu-FTM-400DR-C... Click here to view the article. | |
| Created: 27 Sep 2015 Yaesu FT-747 | |
| Subject: FT-747 and FT-80C fan modification | |
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Note that the output stage is too small and low dissipation. Remove the top cover and remove the final stage. Remove the six screws on the opposite side of the FAN. LOCATE R29 AND PUT IN A SERIES R 2.... Click here to view the article. | |
| Created: 15 Oct 2015 Yaesu FT-991 | |
| Subject: Delete "hum" on the TX signal on FT-991 and MH-36E8J | |
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When the MH-36E8J microphone is used with the FT-991 it may cause a hum on the TX signal. The modification to eliminate the hum is to remove the FT-991 front panel and add a grounding cable (part# T... Click here to view the article. | |
| Created: 20 Oct 2015 Yaesu FT-1000MP | |
| Subject: Fan runs continuously on Yaesu FT-1000MP | |
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This problem was caused by a short in transistor Q9005 on the REG Unit. I replaced the 2SC2001L by a BC517. Pay attention when soldering the BC517. The leads (c, b, e) of both transistors are po... Click here to view the article. | |
| Created: 26 Oct 2015 Yaesu FTM-100 | |
| Subject: Yaesu FTM-100DR wideband modification | |
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Yaesu FT-100DR wideband modification. Download the complete article here. Yaesu-FTM100DR-wideband-mod.pdf Click here to view the article. | |
| Created: 22 Nov 2015 Yaesu MISC | |
| Subject: Modification FTL-1011 6m to 10m | |
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Modification of the fine FTL -1011 operating in the range 6m to work in the 27-30 MHz band 10m . | |
| Created: 23 Nov 2015 Yaesu FT-747 | |
| Subject: NO TX on Yaesu FT-747GX | |
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My YAESU 747 has been resting in a corner of my shack for some years and when I needed to put it back into service the TX side would not produce any measureable output. The RX part worked perfectly. ... Click here to view the article. | |
| Created: 10 Dec 2015 Yaesu FT-757 | |
| Subject: Failure of Yaesu FT-757HD Supply | |
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Symptom : The relay RL1 beats fast (Important noise)Risk : Relay destruction by coal Contact & Destruction of the diode bridge See Failure-of-Yaesu-FT757HD-Supply.pdf Best regards,Ludovi... Click here to view the article. | |
| Created: 23 Dec 2015 Yaesu FT-101 | |
| Subject: PB-1314 mod +6V regulation for FT-101 | |
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YAESU FT101 Power Supply PB-1314 Regulator +6Vdc for the VFO stability The IC-MFC6034A that regulate the +6Vdc for the VFO, was not more available. The solution is to replace it by a popular IC-7806... Click here to view the article. | |
| Created: 27 Dec 2015 Yaesu FT-991 | |
| Subject: FT-991 is dead, when connection microphone MH-36 | |
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Failure Description: When connecting a microphone MH-36 to FT-991 many (nearly all) buttons are out of order. No more function: [ F / M-List ] [ Menu / Setup ] [ Band ] or [ Mode ].When micropho... Click here to view the article. | |
| Created: 28 Dec 2015 Yaesu FT-1000 | |
| Subject: FT-1000 S meter inoperative, poor or no main receive in AM/CW mode. Sub RX OK. | |
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Symptoms: Main Receive not working correctly (almost no AM/CW, FM works, SSB, but at somewhat reduce sensitivity). S Meter inoperative RF Gain control works poorly and incorrectly Sub Receive OK... Click here to view the article. | |
| Created: 28 Dec 2015 Yaesu FT-1000 | |
| Subject: Yaesu FT-1000 Meter Lamp Replacement | |
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The original meter lamp (Yaesu Part number Q1000039) is a hard to find 13.8V bulb and has about the same dimensions as an AGC glass automotive cartridge fuse. I found you can use two 13.8V grain of w... Click here to view the article. | |
| Created: 04 Jan 2016 Yaesu FT-991 | |
| Subject: NAVILOCK NL-604P GPS mouse connect to serial port to FT-991 | |
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The transceiver FT-991 has the possibility to connect an GPS-mouse at the serial port. Here is shown, how to connect the GPS-mouse NL-604P from NAVILOCK. And how to reset the baud rate.&nb... Click here to view the article. | |
| Created: 12 Jan 2016 Yaesu FT-980 | |
| Subject: Extend backup memory life to 10 years on FT-980 | |
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On the FT-980 backup memory battery life is about 6 months with 2000 mAh two AA alkaline batteries. Original backup current is about 140 5A. This modification reduce the current to less than 1 ... Click here to view the article. | |
| Created: 16 Jan 2016 Yaesu FT-991 | |
| Subject: FT-991 REPEATER TONE DECODE | |
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Hello friends, did you ever hear of a repeater that uses CTCSS for access and did not manage to excite him because you did not know them? I think so, no problem going into the menu and the radio he i... Click here to view the article. | |
| Created: 26 Jan 2016 Yaesu FTM-400 | |
| Subject: FTM-400d: US MARKET extended TX mod confusion | |
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FOR US MARKET RADIOS ONLY. Someone has uploaded a diagram with their own schematic designators and table for the 4 band range resistor matrix and it may be causing more confusion than good. The Yaesu... Click here to view the article. | |
| Created: 09 Sep 2015 Antenna MISC | |
| Subject: Basic antenna handbook | |
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Marine-Corp-Antenna-Book.pdf In this manual you can find a view of basics about radiation propagation and others concepts I hope this manual could be usefull for anyone that need basic theory of ... Click here to view the article. | |
| Created: 06 Dec 2015 Antenna MISC | |
| Subject: 2m DF Antenna by G8OSN | |
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A design for a simple to construct and repeatable 2m DF antenna. It uses ready available materials and requires minimal tools to build and set up. G8OSN-DF-ANTENNA.pdf Click here to view the article. | |
| Created: 02 Jan 2016 Antenna HF | |
| Subject: Short 60 meter antenna | |
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The result of following the instructions below will be that you have an antenna that is resonant at 5.3 MHz and is approximately 30 feet long total. This antenna is a short dipole made up of inducto... Click here to view the article. | |
| Created: 08 Nov 2015 Measuring OTHER | |
| Subject: Mototrbo Base/Repeater programming Cable | |
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I was keen to know more about the Motorola Mototrbo, claimed to be the feature-wise futuristic digital radio platform. Even though thousands of pages of tutorial about the various advantages I could f... Click here to view the article. | |
| Created: 02 Dec 2015 Transceiver MISC | |
| Subject: RTL2832-R820T Custom enclosure | |
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Original plastic case didn't allow for heat dissapation or shielding so I machined my own case. The board was fixed with 2 way thermal tape, making sure not to short crystal, capacitor and other... Click here to view the article. | |
Note, sometimes it can be difficult to see the changes since the update can be a little correct in the text, but sometime the update can be a new picture to the existing article.
| Updated: 13 Sep 2015 Icom IC-706 | |
| Subject: ICOM IC-706, NO RX Sensitivity. | |
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( The display is still tuning OK though. ) 1: Check RL1 on the filter board. Watch RL1 as you power on/off. The relay has a clear case. This is a Tx / Rx relay for switching the antenna from the RX ... Click here to view the article. | |
| Updated: 13 Sep 2015 Icom IC-706 | |
| Subject: ICOM IC-706, RF OUTPUT on 1 band only and low on others | |
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This can be caused by a blown relay Driver transistor on the the FILTER board. There are a set of band-pass filters switched by input/output relay pairs. If one of the relays stays closed, then two f... Click here to view the article. | |
| Updated: 08 Nov 2015 Uniden BC-800XLT | |
| Subject: Repair infor for Uniden/bearcat BC-800xlt | |
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Repair information for Uniden BC-800XLT (1.1 Mb). Click here to view the article. | |
| Updated: 08 Nov 2015 Uniden BC-800XLT | |
| Subject: All with TDA1905 Audio on Uniden/Bearcat BC-800xlt and BC-210XW and other | |
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Bearcat TDA1905 Audio Repair (Audio begins to whine and break up as volume is increased) In several bearcat models, including the BC-800 XLT and BC-210XW I have encountered audio problems not rel... Click here to view the article. | |
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