I have an amplifier with a pair of 3-400Zs I built in the 60s. When I built
it it was for 20, 15 and 10 meters.
I used 3 of the 5 positions of a BC375 tuning unit switch. Everything work
fine. I added 160, 80 and 40 meters.
160 was switched in and out with a RJ-1a vacuum relay. When I went to 20
Does aanyone have a roll/spool of 450 ohm ladder line they could unroll 20' of
and send to me? I jist don't want to have to order 20' of the stuff and pay
the high price!
I'd certainly reimburse you for the cost and shipping..reply off line if you
can help..tnx.
72/83 Jim R. K9JWV
James, Did you check with Wireman as they sell by the foot for
reasonable prices?
Herb, KV4FZ
On 3/19/2014 9:13 AM, James Rodenkirch wrote:
Does aanyone have a roll/spool of 450 ohm ladder line they could unroll 20' of
and send to me? I jist don't want to have to order 20' of the stuff
Hi Jim,
They call everything 450 ohm.
450 ohm ladder line is not really 450 ohms, unless you use a certain type.
It actually ranges from around 350 ohms upwards, depending on line type.
If you need to not mix impedances, what type line do you have now?
73 Tom
- Original Message -
The HV build up was mitigated by the 10pf cap between the 40-20M positions
which also reduces arcing on the SB-220 which is a shorting switch and a cap
can be adapted to some 160-10M amps. The right hand one in that photo had
the 80-40M contacts replaced and Id bet there was still a carbon trac
Wrong reflector, but I disagree completely with this:
The HV build up was mitigated by the 10pf cap between the 40-20M positions
which also reduces arcing on the SB-220 which is a shorting switch and a
cap can be adapted to some 160-10M amps. The right hand one in that photo
had the 80-40M co
Repeat - the server strips out the HTML link.
To the deserving:
The FT5ZM DXpedition remains about 10% short of their financial goal. If you
haven’t already done so, the team’s efforts and remarkable accomplishments
deserve your support. Every little bit helps and further encourages these
self
To the deserving:
The FT5ZM DXpedition remains about 10% short of their financial goal. If you
haven’t already done so, the team’s efforts and remarkable accomplishments
deserve your support. Every little bit helps and further encourages these
self-sacrificing team members to activate another r
For those who may not be aware of www.hamradionow.tv Part #2 of Episode #137
is a video of presumably the first of many presentations on the FT5ZM
operation. This one by K4UEE was nicely done at the Charlotte, NC hamfest
held earlier this month. Of interest to me besides all the great pictures
wa
I have burn up two output band switches on my Ameritron AL1200 while on
160m. The amp uses a single 3CX1200A7 tube. My swr may have been high, but
less that 3:1.
Could the discussion above be the same for the AL1200 amp? I'm tired of
replacing the band switch. I looked at replacing it with a large
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