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Harry Munday edited this page Aug 2, 2023 · 66 revisions

RF Tap Installation Guide

Next Page The RF Capture Guide

First please look at The Tap list Example VCR's

Firstly see if your VCR or similar has been added to the list or just want real-world visual examples of tapped decks, the method you wish to go is upto you but soldering is recommended!

Soldering-Free Setups

While soldering is encouraged and quite easy in practice it can be scary to some and to get started, we understand some people might not want to take an iron to there VCR, especially a higher-end one.

This does not mean however you can neglect the basics of cleaning your VCR heads and checking it over, as it's a mechanical machine just like a car or any other tool it requires some level of care, like re-lubrication and cleaning read more below for basic information on that.

(Not always the best methods, but better than nothing if soldering is not physically possible)

DuPont Pin Method

Sony/Sanyo decks normally have 2.54mm pin-header test points

(These cables can be made at home with RG316 & 26AGW copper wire via soldering iron, crimper & heat shrink)

DuPont Female to BNC / DuPont Male to BNC / SMA to DuPont Female adapters.

Heres an good Example (This applies to VHS/Beta/Video8/High8)

If you go the Dupont pin method use an In-line Capacitor (Limits signal draw to allow for live playback alongside RF capture) Aliexpress / Amazon US

BNC Probe Method

BNC probes can be used for a solderless hook-up, but may not have as reliable signal and can easily be knocked free, unlike a soldered and mounted RF Tap.

BNC Algator / BNC Hook / BNC Standard

BNC Banana + Banana Pin Probes

Jig Method (Video8 & Hi8)

On most Sony Digital8 camcorders that support backwards playback, at the battery area, there is a rubber grommet or screw down plate once removed this exposes the Jig connection point for testing this is normally 16/18/20 pin ribbon connectors with a 0.5mm pitch, a readily avalible and generic interface this is the go-to method for Video8/Hi8 tape formats.

Simply visually check your pin amount and buy the correct jig with the links below.

Check the service manual to see what pins have the RF signal, and your ready to go, however a cap may be needed in-line like any RF capture method.

Jigs (Unpopulated) / Jigs (With 2.54mm pins) / Flex Cables / DuPont to BNC / Type 2 USB Power Adapter / Type 1 USB Power Adapter

Helpful Videos for Absolute Beginners

The NASA Standard of Soldering

Beginner's Guide to Soldering Electronics

Electrical Components Guide

How to use a Digital Multi Meter (DMM):

Voltage Measurement & Basic Usage

Current Measurement

Resistance & Continuity

Tooling & Equipment

You will need the following items

Essentials

Optional but worth it for anything related to electronic's work

Modern Combo DMMs like the OWON HDS2102S / Link 1 / Link 2 are a True RMS Digital Multimeter, Oscilloscope & a Waveform/Tone Generator in one unit.

Building a Soldering Kit

Here's the PINECIL with a built-up kit.

Here's the Rhaegon RJ2090 iron with what comes in the box. (Solder/Flux/Tweezers/Cleaning Spouge)

Extra Soldering Iron Tips

NOTE You can get whole lower end kits like This for 15-25USD total, just get one with a grounded iron (has 3rd earthing pin), get a cleaner ball and some proper flux/solder and they will work okay for basic usage.

Basic Parts for making an RF Tap

Note on White CX Cards you use the S-Video Luma pin for the RF input, this can be modified for a BNC if desired.

Connection Cables

DuPont Cables

Jigs (Sony Camcorders)

Notes

Note Having a 3rd arm holder with at least 2 metal clips is very helpful to hold connectors and the cable steady while soldering.

Note The RHAEGON iron generally comes in a kit with basic flux, cleaning spouge, 2 ESD tweezers and a roll of 240c melting point lead free solder, ware as the PINCEL can run off USB-C PD or DC power and tips can be hot swapped on the fly.

Note A clean & tinned soldering tip is a happy long lasting tip.

Note The In-line capacitor method is generally a coverall at the 10uf mark, 3.3uf-100uf range work fine but 10uf was standardised as its widely available and has worked perfectly with several VHS/SVHS/Betamax decks.

Cleaning Supplies

This is all you need for cleaning the head drum & VCR tracks boards and plastics even a light servicing can make a world of difference in reliability of a VCR.

  • 99.9% IPA (Isopropanol/Rubbing alcohol) (Don't use on rubbers)

  • Wet Wipes & Paper Towels (General Cleaning)

  • Nail Wipes & Printer Paper (Cleaning of VCR head/tracks)

  • Cotton Buds (Q-Tips)

For initial board cleaning and removal of dust and other surface contaminants also recommended is:

  • WD40 Electronics Cleaner (Aerosol Liquid Version of WD40 basically)

  • Assortment of Brushes

Maintenance Supplies

Note! for Betamax players using only alcohol-wetted paper is recommended for head cleaning as they will catch easily on anything else.

Components that are involved:

  • Capacitor
  • BNC Bulkhead
  • RG316 Cable

Here is a £1 Coin & an AA Battery for size reference.

100uf 16v, 10uf 50v, 10uf 25v, - Electrolytic Capacitors (Caps) (Ceramic Recommended)

BNC Mountable Plastic Solder-able, BNC Bulkhead Metal Pre-Made.

Step 00: Inspect Your VCR

Firstly before you start doing anything, check the model number on the top lid and back label use this to find the service manual.

Then disconnect power wait a few seconds and then remove the lid/top panel be careful around the edges on metal ones as stamped metal sheets can cut though skin if you run a finger across the edge carelessly but should slide off upwards from the back of most standard VCR units.

Colour Atlas of VCR Hardware

This varies based off year and market of the VCR modern later decks use more multirole IC's, ware as prosumer to rackmount units will have core parts for each processing task on dedicated boards and be majority though hole parts

Panasonic NV-HD630 For Example

Numbered Boxes In RED test point locations for signals.

  1. TW3001 RF C - Video FM

  2. TW501 FM Mix Out - HiFi FM RF

  3. TW26 CVBS Out - Composite Video Output

  4. TW3 CVBS Input - Composite Video Input

  5. TW502 - ENVE (HiFi FM RF)

Left Hand Side

  • Pink - TV Modulation & De-modulation pack
  • Golden Yellow - Audio Processing (Nicam)
  • Bright Yellow - Video Processing

Middle

  • Purple - Head Amplifier Board
  • Blue Box - VCR Loading & Playback Mechanical System or "Mech"
  • Yellow Circle - VCR Head Drum & Connection Board
  • Green Circle - Tape Guides & Guide Path
  • Light Blue Left - Erase Head
  • Orange Circle - Linear Audio or Edge Track Audio Heads
  • Light Blue Right - Rubber Pinch Roller
  • Brown Boxs Center/Right - Head Drum RF Ribbon

Right Hand Side

  • Red - AC Power Supply Stage
  • Green - DC Power Supply Stage

Always Inspect & clean a VCR before running a tape though, it is the best first action, not only so you don't contaminant or break your tapes but your its self deck, if its in good working order and already been serviced just clean the heads.

Always remove the little head cleaner off the the side of the drum if there is one, as they are just dirt spreaders and can cause contamination.

Check that tape guide tracks are well lubricated if it looks shiny/bare then there's probably not enough.

Pinch rollers baring's can be lubricated with a drop of oil, and guides can be cleaned with wipes then use 99.9% Isopropanol.

Once cleaning has finished double check, if there is signal issues always good to check if there is cracked solder joints on the head drum from transport.

NOTE! Be careful to not touch the mains power supply area this can shock you and or kill you if you bridge the AC stage but generally, these have metal shielding and are isolated off to one side of the VCR always service equipment after it has been un-plugged and discharged of power.

Plastic back units can be marked and then poked through and slowly rimmed into a round hole via soldering iron at 340°C be careful not to overdo it, and cut the excess off with cutters for a flush mounting of your connector this is the easiest mod and looks very clean if you mark it properly.

Metal Units may require a 1/2-inch drill bit ideal for bigger Bulkhead pre-made cables this is useful on decks like the MD/AG/BR lines of SVHS decks which normally have blank or user-replaceable add-in module panels for external deck control boards.

Step 01: Find FM RF Test Points

Video FM RF / HiFi FM RF

This list is a work in progress based on service manuals and direct user experiences and may not include every possible name but covers the majority of VCR's on board and on service manual wording.

Note!:

Most decks will also have a composite test point which can be useful for adding a composite output on SCART-only decks.

Note!:

If your VCR was serviced likely there are some pen marks on the board at test point locations.

Test Point Names

Video FM RF Signal:

RF C, RF Y, RF Y+C, V RF, PB, PB.FM, V ENV, ENV, ENVE, ENVELOPE, VIDEO ENVE, VIDEO ENVELOPE

HiFi Audio FM Signal:

HiFi, A.PB, A FM, A.PB.FM, Audio FM, A-Out, A ENV, HIFI Envelope, FM Mix Out

How to read service manuals

Follow the yellow brick road (The Contrasting Line Indicators)

In modern manuals the servicing book will directly correspond to labels physically on the boards in older manuals, they will look like TW1000 but be TW1 on the boards lable or silkscreen.

For example, HiFi on the AG-7150 is TP4707 in the manual but just 707 on the label it's sometimes confusing if you're not used to reading them or probing every test point.

There is always contrasting arrows showing the signal path on service manual diagrams, trace the line to find test points along the signal path.

Heads --> Amplfication --> Test Points --> Video Processing --> Video Playback

Note: Sometimes both test points can be called ENV.

Types of Test Points

Test points vary in type generally all are through-hole.

Consumer Decks will have bar style and floating bar style test points with floating being easy to probe but bar style generally needs fine tip probes.

Prosumer & Professional decks typically have hook-to and poll-style easy test points to solder to and are easily user accessible.

Flat Bar Style

Floating Bar Style

Poll Style

Loop Style

Pad Style

Header Pin (2.25mm) "DuPont"

Types of RF Connectors

Full-BNC

Is the best for fixed backports with a locking and reliable connector used in everything from 1960's communications gear to current-day cine cameras, this is the most preferred connector due to reliability.

SMA

Is a flat external-sided, threaded locking connector found in almost all common consumer RF devices such as 4G/5G, Wifi Dongles, Handset radio units a small and versatile connector for internal use not the most physically strong for external use.

Note

RP stands for reversed polarity so the signal is on the ground and the ground is internal these pins are respectively also re-versed for these connectors.

SMB

Is the lesser-known sibling of SMA but it's a tighter than TS-9 style non-locking connector.

Micro-BNC

Also called DIN 1.0/2.3 Is the smallest locking knock-safe connector seen on portable equipment like PCIe cards and field recorders (Reference Part Number: 45K201-400L5)

DuPont Connector "Header Pins"

These are the most widely known connector technically called a 2.54mm Header Pin these are used for kid's kits to diagnostic test points or low-power/data connectors for computer hardware such as fans or Molex power, these normally use 26AGW wire.

Step 02: Planning your cabling route

Metal decks will normally need a drill press, but plastics decks can be easily melted.

Cut away exsess and flush mount your BNC connectors.

After finding the best places for the BNC bulkheads and test fitting them you can then route your cable to the nesssaserry lenth.

Step 04: Cabling

If space permitting you can save some effort and just get a premade BNC bulkhead and cut the end off.

There are 2 standardised cable types.

Top - RG316 cable this is used on most 50ohm pre-made cables.

Bottom - RG178 cable is slightly smaller.

Both have practically the same performance in terms of RF signal at 50~100cm of length.

Measure with 5-10cm of slack your cable run from your test point to where you would like to mount your BNC on your unit normally this is at the back and or next to the normal audio and video output ports.

  1. Prepare your iron at 300°C keep it tinned until ready for use then clean off the solder.

  2. Measure about 3cm of cable length and mark it with a pen or your iron.

  3. Stripping your wire, use a pair of automatic wire strippers or your iron at 300-350°C the outer insulation layer will melt so you can rim around the outer cable then carefully pull it off with tweezers or fingers.

  4. Pull back the strained outer wire and twist it together.

The inner insulator is easier to pressure the cable with the tip of your iron against a surface like ceramic in a pulling motion and you will easily strip the insulation off, though

NOTE! without fluxing & tinning this wire you may have insulation residue, automatic wire strippers are more suited for this task but can be slightly tricky with RG316.

Soldering-Insulation-Stripping

  1. Twist the inner wire strands and tap the end with a bit of solder, this stops the wire from fraying.

If a premade bulkhead is used you can solder the inner wire to a capacitor and then solder that to the board which can be helpful as you can hold the capacitor with tweezers or a finger.

Properly Stripped Cable

Then measure up to the BNC connector & solder it

  1. Clean and flow some fresh solder onto your Iron.

  2. To flow solder into the middle pin, add a small dab of flux into the middle pin hole.

  3. Double back your cable if using RG178, holding the connector the cable inside the connector, then add some more solder to your Iron and gently press into the open end of the connector this will in 1-2 sec flow solder correctly.

  4. Wipe excess flux off and insulate with hot glue and or heat shrink.

Always Insulate your connectors

You can do this with electric tape, heat-shrink, hot glue, silicone sealant once you know you have a good weld on the signal and ground solder joints this stops stray contact with dust and other wires.

Step 03: Installing a capacitor on your RF tap

(Note this photo is before flux is cleaned off, you should always clean your area with 99.9% IPA after soldering is finished)

(If both are even then this is a non-polarised cap and does not matter)

You can test your test points with a 10-sec capture at this point with no displays connected via probes.

Once your test points have been located depending on your available space you will most likely want to line up your 3.3-100uf range capacitor to the test point holding it down with tweezers or via tape/hot glue.

Polymer and ceramic capacitors, these are not polarised so which of the 2 legs are used does not matter, for electrolytic capacitors the negative leg goes into the test point and the positive to your cable.

Take your soldering iron that's heated to 280~320°C

Lay your capacitor next to for bar style or wrap half around for poll style

NOTE! The Negative leg is always the shorter of the two which makes it easy to visually identify.

Using an easy example here, as the rackmount decks have removable Audio/Video cards.

line Up your capacitor to the test point bend the negative leg into a U then cut the excess off.

Tin your iron clean it, then tin again and flow some solder onto the iron while in contact with the leg and wire.

Once the capacitor is added then solder your cable to the positive end.

Run the outer shield to the ground or run a little extra cable for grounding.

Examples

Panasonic AG7150 Video Processing Card Tap to BNC routed though a vent.

Panasonic NV-HS950B TBC Card Video ENV Tap routed though the frame.

Panasonic-HD630 Video/HiFi FM & CVBS mounted to BNC Bulkheads.

Hookup your capture device & Capture!

Cables & Adapters List/Guide

For CX Cards use the Luma Pin with an S-Video breakout cable, or BNC if modified.

Use 50Ohm cables or a direct coupler for DomesDayDuplicator or other USB based SDRs.

Page End

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