As others have already said, FCC approval does not apply to imported
amps. That's why you could purchase Emtron's DX-2sp, DX-3sp, and DX5
tetrode amps. The gain was not limited as is the gain for the OM amps.
IOW, you could import a 10 or 20 KW band switched amp with 20 plus db
gain, no questions asked. This gave us the ability to purchase a manual
tuned amp with enough overhead to run digital @ 100% duty cycle. Of
course that overhead also gave the ability to run 2.5 to 3 KW PEP.
The only caveat is they have no US based sales outlets.
The gain limit has long been outdated as the reason for it has not
existed for decades. Will the FCC ever get rid of limiting the gain of
separate amps? Recently there were letters of comment that were almost
irate about removing the gain limits. Apparently those hams are still
living in the past. The same can be said for amps being sold that
require hams to modify them to cover 10 meters.
73, Roger (K8RI)
On 5/16/2017 Tuesday 12:42 PM, Jim Thomson wrote:
Date: Tue, 16 May 2017 05:11:38 +0000
From: Bill Turner <dezrat@outlook.com>
To: Amps group <amps@contesting.com>
Subject: [Amps] Interesting new amplifier
<4Z4RB has been selling amplifier boards on eBay for some time, but I
<see he now is selling a complete amp (less power supply) at a pretty
<good price:
http://www.ebay.com/itm/1500w-2-x-LDMOS-LINEAR-POWER-AMPLIFIER-LEGAL-LIMIT-/162503347501?
<Obviously not FCC approved. I suspect he gets around that by claiming,
<in effect, that it is homebrewed. Is that legal?
<I sent him a message asking about duty cycle at full power and if a
<manual can be downloaded. Waiting for reply.
<Does anyone have any experience or comments about the amp or the
<seller?
<73, Bill W6WRT
## Looks like a bargain to me. He also makes a 1 kw amp with a single LDMOS
device.... $1600.00 ( also less power supply).
http://www.ebay.com/itm/BLF188XR-1kw-LINEAR-POWER-AMPLIFIER/162503185277?_trksid=p2047675.c100005.m1851&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D2%26asc%3D40130%26meid%3D0b6e78f2c5754c899998225e57dddd32%26pid%3D100005%26rk%3D5%26rkt%3D6%26sd%3D152536460986
## The 1.5 kw amp Bill mentioned above is $2400.00 ( less power supply).
Both amps cover 1660-6m...and both contain 7 x LP filters. I dont see 30M
band on either of them though.
## either of them can be driven with just 5 watts. He has a 5 / 50 input on
the back, so a 10 db attenuator can be switched in for your typ 100w xcvr.
## he also offers an optional vac relay. Rated for AM, FM, SSB, CW. No
mention of duty cycle or imd etc.
I nominate Bill to race out and buy one, then evaluate it for the rest of us.
Jim VE7RF
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