<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content="text/html; charset=iso-8859-1" http-equiv=Content-Type>
<META name=GENERATOR content="MSHTML 8.00.6001.19190">
<STYLE></STYLE>
</HEAD>
<BODY style="FONT-FAMILY: Arial; COLOR: #000000; FONT-SIZE: 10pt" id=role_body
bottomMargin=7 leftMargin=7 rightMargin=7 topMargin=7 bgColor=#ffffff>
<DIV><FONT id=role_document color=#000000 size=2 face=Arial>Just catching up on
posts. Did not mean to imply that adding a hi-band head to a lo-band machine
would constitute the complete conversion, it's just one step. However, doing
this on a TR-5 did make the editors more pleased with the quality of video
brought back from remotes.</FONT></DIV>
<DIV> </DIV>
<DIV>Hi-banding was an expensive operation for a small station in the 70's. We
had moderate success hi-banding (playback only!) a couple well-used TR-22's
by following a homebrew procedure given to us by some helpful folks at a Kaiser
Broadcasting station in Detroit, where the non-RCA conversion was probably
designed. Widening out the bandwidth of the RF stages was a big part of the
process.</DIV>
<DIV> </DIV>
<DIV>One safety note for anyone working on a TR-5. The deck will raise up about
10 inches in the back, making it easier to slap those heavy 60 min reels of tape
on the machine. There is a potential guillotine hazard if fingers get caught
between the underside of the raised deck and the machine's side panels; and the
deck drops unexpectedly. A single pair of telescoping square metal tubes with a
pushbutton latch are all that supports the raised deck. I drilled a hole in the
lower tube and put a #10 bolt through it whenever the deck was raised, which was
95% of the time.</DIV>
<DIV> </DIV>
<DIV>The machine in the color photo looks very clean, like it had seldom been on
the road. Just hook the video out to an old monochrome Conrac monitor with a
decent sync separator and playback will be fine for a museum. Consider showing
off the unit with monochrome video in LBM mode, to get away from the fuzzy
appearance of color, due to the lesser-deviated LBC mode and dot-crawl
issues.</DIV>
<DIV> </DIV>
<DIV><FONT color=#000000 size=2 face=Arial>[snip]</FONT></DIV>
<DIV><FONT color=#000000 size=2 face=Arial></FONT> </DIV>
<DIV><FONT color=#000000 size=2 face=Arial>FIG. 2. All of these transistorized
TV tape recorders include<BR>new circuits needed for high-band operation. For
TR-22's, high<BR>band is a third mode of operation which can be added
to<BR>monochrome and color modes already built-in. For the TR-3,<BR>TR-4, and
TR-5 the high-band mode can be selected as a<BR>second mode of
operation.</FONT></DIV>
<DIV><FONT color=#000000 size=2 face=Arial></FONT> </DIV>
<DIV><FONT color=#000000 size=2 face=Arial>[end]</DIV></FONT></BODY></HTML>