Created: 06 Oct 2013 Alinco DR-510

Subject: Combining Tone Burst and Tone Squelch for Alinco DR-510

The document describes how to install the ToneBurst and the Tone Squelch pcb together in the DR510 combining both worlds and functyionality. A small modification has to be made to the unit in order to... Click here to view the article.

Created: 22 Dec 2013 Heathkit TT-1

Subject: Upgrading the heathkit model TT-1/TT-1A Tube tester to the TT-1B

I have just completed my most recent paper VR-005 ("Upgrading the Heathkit Model TT-1/TT-1A Tube Tester to the TT-1B") and have attached the zipped file to this article. In addition to this paper (in ... Click here to view the article.

Created: 07 Oct 2013 Icom IC-718

Subject: Change the original Fast/Medium AGC to Slow AGC, reduced noise for IC-718

Open the service manual (recommended) or schematic diagram.In RF Unit schematic,find Q1801,1802 and 1803.Thats are two transistors PNP and NPN in one package ( = IC ? ),function is AGC switcher.AGC is... Click here to view the article.

Created: 07 Oct 2013 Icom IC-756PRO3

Subject: IC-756Pro3 IF Tap For HF SDRs

The IF for the IC-756PRO series of radios is up around 64 MHz and is outside of the range of most of the HF SDRs doing the rounds. So a tap point that is below 30 MHz needed to be found. The spectrum ... Click here to view the article.

Created: 09 Oct 2013 Icom IC-7600

Subject: ICOM IC-7600 Scope IF tap for RTL-SDRs

When I started to use the IC-7600 I really appreciated the nice display and the Spectrum Scope. I also like to use my PC or Mac to control radios and play with SDRs (software defined radios). Now, th... Click here to view the article.

Created: 16 Nov 2013 Icom IC-V8000

Subject: TX power problem at low level.

IC-V8000 has 4 output power levels, LOW(5W), Mid-Low(10w), Mid(25W) and high(75w). Sometime this rig has a problem, that is output power less than 5W(ex, 3W) at LOW level or Mid-Low level. If you wa... Click here to view the article.

Created: 30 Nov 2013 Icom IC-756PRO2

Subject: IC-756 pro II IF output for IF panadapter

IC-756 pro II IF output for IF Panadpter Filippo Ottone IZ1FKS Warning: This modification might damage your radio, void the warranty, and/or cause personal injury. You ... Click here to view the article.

Created: 12 Dec 2013 Icom PW-1

Subject: Icom IC-PW1 CI-V data corruption problem solved.

Icom IC-PW1 modification. The Solid state 1kW power amplifier Icom IC-PW1 has a flaw which is potentially a ticking time bomb.If you are a contester, and use the PA with an Icom Exciter like a IC-756... Click here to view the article.

Created: 24 Dec 2013 Icom IC-7700

Subject: Second external receiver with antenna switching on IC-7700

NON-INTRUSIVE METHOD FOR CONNECTING A SECOND RECEIVER TO THE ICOM IC-7700 One thing that some say let down the Icom IC-7700 is the lack of a second receiver. This modification makes use of ... Click here to view the article.

Created: 27 Dec 2013 Icom IC-207

Subject: Intermittant audio Icom IC-207H

Audio out was intermittant and sometimes distorted, I found that the audio ic, top mounted and on heat sink was poorly soldered on top of pc board. Very easy to get to and re-solder. Click here to view the article.

Created: 02 Nov 2013 Kenwood TS-850

Subject: TS-850S CAT interface

The Kenwood Transceiver TS-850S (AT) is often used by contest operators. This interface enables the transceiver to communicate with a personal computer and the respective log-software. The CAT-connec... Click here to view the article.

Created: 05 Oct 2013 Kenwood TK-880

Subject: Self programming mode for Kenwood TK-880

This will enable Self Programming mode First must enable from software KPG-60D option Edit ––––Optional Features 2––––Self Programming Mod (enable) Se... Click here to view the article.

Created: 07 Oct 2013 Kenwood TS-2000

Subject: How to use the analogue input/outpout of the ACC2 connector (TS-2000 and similar)

The user manual, chapter 16 (MPC and TNC connection table) is not very clear concerning the use of the analogue rear input Pin 11/ACC2. To connect an analogue input signal for transmission (fax, SSTV... Click here to view the article.

Created: 09 Oct 2013 Kenwood TM-D710

Subject: Expand TX in TM-D710E (European Version)

1. Unscrew 8 screws and remove top cover (speaker side). 2. Locate socket for voice module. If you have voice module installed, remove it. 3. Unsolder resistor on W601 position (it could be resistor... Click here to view the article.

Created: 14 Oct 2013 Kenwood TS-2000

Subject: TS-2000 TX power problem

The transmitter does not transmit power, controlling the final stage, the transistor: q2, q3, q4, the stadium pre driver is ok, amplifiers, and final, are ok. The problem is the resistance position (... Click here to view the article.

Created: 14 Oct 2013 Kenwood TS-2000

Subject: TS-2000 fix attenuator problem

Problem with attenuator, entering the same, it stops receiving. The problem are the two resistors on the TX-RX unit 1, (X57-605X-XX) (A/9) (HF/IF) R3 = 100 ohms, R2 = 470 ohm smd resistor terminated ... Click here to view the article.

Created: 25 Oct 2013 Kenwood TS-2000

Subject: Wide Pan-Adapter for the TS-2000

by Carsten DL7CG There are several modifications to access the lower IFs (intermediate frequencies) of the TS-2000. One common application is to build cheap pan-adapters / band-scopes by using SDRs (... Click here to view the article.

Created: 19 Nov 2013 Kenwood TM-D710

Subject: TM-D710E low sensitivity of VFO A or VFO B, 144,00, 430,00.

Kenwood TM-D710E, low sensitivity of VFO A or VFO B, 144.00 MHz and 430.00, the problem is the migration of the filter 455 khz, replace the four filters production Toko, with murata filters, of follow... Click here to view the article.

Created: 24 Nov 2013 Kenwood TS-450

Subject: External cooling fan on Kenwood TS-450S

The TS-450 will be very hot, internal ventilator works OK but I like to get the heat out when the internal ventilator stops. This is wat I have done. First of all you need to make an aluminium mounti... Click here to view the article.

Created: 25 Dec 2013 Kenwood KPS-15

Subject: Mods for kps-15 switching power supply

Hi all .. my Kenwood KPS-15 switching power supply was noisy in my hf radio .. so i modified the ps. Very easy to do and its work well for me .. I removed the 4 screws and the cover... Click here to view the article.

Created: 27 Dec 2013 Kenwood TS-870

Subject: No transmit power on Kenwood TS-870

Transmit was on but no power output, bias transistor Q504 emitter was 3.2 v instead of 1.3 and was 3.2 when not in transmit also. Lifted the E lead and voltage still high. Turned out to be leaky Q502... Click here to view the article.

Created: 27 Dec 2013 Kenwood TS-870

Subject: Display reads error below 7.5 mhz - TS-870

When the radio was tuned below 7.5 mhz the display would read error and beep sound. Turned out to be PLL unlock problem. Cure is Pll alignment as per service manual. The adjustment that was off worst... Click here to view the article.

Created: 09 Oct 2013 Other MISC

Subject: More Modulation for RF-Limited CR-577

To get more modulation from CR-577 you have to find R1 ( 2.2K ) and swap it with 680R. Now you can keep down the volume knob at level 5 instead 10 on your CR-577. Regards, Sven ( Hifiaudioteam ) Click here to view the article.

Created: 10 Nov 2013 Other MISC

Subject: Baofeng UV-5R CAT interface

Homemade computer interface for Baofeng UV-5R. Picture: uv-5r-interface.jpg Click here to view the article.

Created: 11 Nov 2013 Other MISC

Subject: Checking your Acom A1011 amplifier for factory modification

V1.0 Written by H.P. Vermeulen ¡V PA3HHO. Disclaimer: Please note that I have written this document only to help out fellow hams. I have no relation to Acom in Bulgary whatsoever (except for th... Click here to view the article.

Created: 25 Nov 2013 Other MISC

Subject: Modifying the PRC174 to operate on 160m

To modify the PRC174 to transmit on 160m involves 3 small changes. Total part count is 3 components a small signal transistor, a resistor and a capacitor.The normally 174 will not allow transmission b... Click here to view the article.

Created: 09 Dec 2013 Other MISC

Subject: How to switch the Anytone AT-5555 (v.6.0) Transceiver from 10-metre Amateur Bands to CB Bands

Simply follow instructions and without software you can change frequencys without a computer Also works on different versions thx AT5555-to-CB-switchover-a-1.pdf Click here to view the article.

Created: 18 Dec 2013 Other MISC

Subject: TAD M8 dealer programming mode

Too make this radio programmable from front face first thing you have to do is: remove top cover and remove the shield cover (tin) from the control board. Locate points marked JW203 install a jump... Click here to view the article.

Created: 27 Dec 2013 Other MISC

Subject: Diamond DSV-3000, blower mod new models 2013

The new models (2013) GSV-3000 have another blower schematic/circuit. They have put in a 24V 90mA fan and connect it straight to the 24V diode bridge. So it is at full speed. The ... Click here to view the article.

Created: 21 Oct 2013 Yaesu FT-840

Subject: Filter Mod with smd caps to complement the on7wp mod

Picture to complement the on7wp mod to the ft-840. The mod was made under the main pcb.Picture: ft-840-filter.jpg Click here to view the article.

Created: 01 Nov 2013 Yaesu FT-857

Subject: Yaesu FT-857D, all in one box

kc8vka portable pack Picture: 20131031-215933.jpg Picture: 20131031-215831.jpg Picture: 20131031-215441.jpg Picture: 20131031-220529.jpg Click here to view the article.

Created: 27 Nov 2013 Yaesu FT-5100

Subject: Low RF output power => repair of PA in FT-5100

Hi, if your FT-5100 shows low or nearly no RF output power at all, the first guess is that the PA is broken. In fact, measurements at my FT-5100 showed that the PA-Module got an RF-Signal from the d... Click here to view the article.

Created: 01 Dec 2013 Yaesu FT-DX5000

Subject: FTDX5000 135kHz TX modification

How to open 2200meter band. Take all plugs off from radio then take off bottom cover. The CNTL unit will appeared at bottom side of the unit Make a solder bridge at "10" position P... Click here to view the article.

Created: 25 Dec 2013 Yaesu FTM-400

Subject: Crossband Repeating Yaesu FTM-400DR/DE

FTM-400DE/DR Cross Band Repeating is an undocumented feature Disable the APRS MODEM (OFF) in the settings. Use different settings for [A] band and [B] band, VHF/UHF or UHF/VHF. .... Click here to view the article.

Created: 27 Dec 2013 Yaesu FT-736

Subject: Fix power supply failure for Yaesu FT-736

Internal switching power supply failed to start.Schematic for switching power supply is not in radio manual schematic. I found C-12 1mfd 50v and C-9 220 mfd 16v were both open, replace wi... Click here to view the article.

Created: 03 Jan 2014 Yaesu FT-2500

Subject: Ft-2500 goes into tx but has no output power

Bias to final output ic missing, found open foil on top of main pc board where low, medium, and high bias goes from Q1019 to coils L1024 AND L1016. Foil was open just at collector lead of Q1019 where... Click here to view the article.

Created: 26 Nov 2013 Power supply 12 VOLT

Subject: Very nice how to to convert a PC Power Supply to a Bench Power Supply

While I was searching the web on ways to recycle some PC Power Supplies, I found a nice artical on a fun and practical DIY. The main article I made mine from was here. http://www.wikihow.c... Click here to view the article.

Created: 14 Dec 2013 Receiver AUDIO

Subject: A simple ext. Speaker with Noise Limiter/ NF Filter

Ext. Speaker with Noise Limiter/ NF Filter This is a very easy way to bring an old 8 ohm Surround Speaker back to life. I used an old JBL Flix1 Surround from the 90`s, but every "good", small 8 ohm ... Click here to view the article.

Updated: 13 Dec 2013 Yaesu FT-897

Subject: FT-857D & FT- 897D MARS/CAP Mod (US Version)

Use the same mod. as the 857/897 except you will place a jumper (solder) on pad 106. On the 857&897 this is left in. On the 857D & 897D it is removed to give you 60 meters. It needs to be rep... Click here to view the article.

Updated: 08 Oct 2013 Yaesu FT-DX5000

Subject: FULL COVERANGE TX-RX 1.8/30Mhz for a Yaesu FT-DX 5000

Located a CNTL UNIT, in a left corner of the circuit you can see JP 4505, solder it. Reset a CPU 73 de IZ5MJS Franco Click here to view the article.